CS42L52
Low Power, Stereo CODEC w/Headphone & Speaker Amps
Stereo CODEC
High Performance Stereo ADC & DAC
– – – – – – – – 98 dB Dynamic Range (A-wtd) -88 dB THD+N 4:1 Analog Input MUX Analog Input Mixing Analog Passthru with Volume Control Analog Programmable Gain Amplifier (PGA) Noise Gate for Noise Suppression Programmable Threshold & Attack/Release Rates Differential or Single-Ended +16 dB to +32 dB w/1dB step MIC PreAmplifiers Programmable, Low Noise MIC Bias Levels Bass & Treble Tone Control, De-Emphasis Master Vol. and Independent PCM SDIN + ADC SDOUT Mix Volume Control Soft-Ramp & Zero-Cross Transitions Programmable Peak-Detect and Limiter Beep Generator w/Full Tone Control
+1.65 V to +2.63 V Analog Supply
Summing Programmable Gain Amps
Class D Stereo/Mono Speaker Amplifier
No External Filter Required High Stereo Output Power at 10% THD+N
– – – – – – – 2 x 1.00 W into 8 Ω @ 5.0 V 2 x 550 mW into 8 Ω @ 3.7 V 2 x 230 mW into 8 Ω @ 2.5 V 1 x 1.90 W into 4 Ω @ 5.0 V 1 x 1.00 W into 4 Ω @ 3.7 V 1 x 350 mW into 4 Ω @ 2.5 V Battery Level Monitoring & Compensation
Flexible Stereo Analog Input Architecture
High Mono Output Power at 10% THD+N
Programmable Automatic Level Control (ALC)
Direct Battery Powered Operation 82% Efficiency at 800 mW Phase-Aligned PWM Output Reduces Idle Channel Current Spread Spectrum Modulation Low Quiescent Current
Dual MIC Inputs
– – – – – – – –
Stereo Headphone Amplifier
Ground Centered Outputs
– – – – No DC-Blocking Capacitors Required Integrated Negative Voltage Regulator 2 x 23 mW Into 16 Ω @ 1.8 V 2 x 44 mW Into 16 Ω @ 2.5 V
Digital Signal Processing Engine
High Power Output at -75 dB THD+N
(Features continued on page 2)
+1.60 V to +5.25 V Battery
+ + -
+1.65 V to +2.63 V Digital Supply
Battery Level Monitoring & Compensation Temperature Monitor ALC Pulse-Width Modulator (PWM) Class D Amps Multi-bit Volume, Mono Swap, Mix Mono mix, Limiter, Bass, Treble Adjust
Σ
Left Inputs Right Inputs
1 2 3 4 1 2 3 4
Beep
Stereo/Mono Full-Bridge Speaker Outputs Left HP/Line Output
ΔΣ ADC
Multi-bit
ΔΣ DAC
Ground-Centered Amps
Σ
+16 to +32 dB Diff./ S.E. MIC Pre-Amps MIC Bias
ALC
HPF
Right HP/Line Output
Serial Audio Port -VHP +VHP
Control Port
Speaker/HP Switch +1.65 V to +2.63 V Headphone Supply
Level Shifter
Charge Pump
Selectable Bias Voltage
+1.65 V to +3.47 V 2 I C Control Interface Supply
Reset
Serial Audio Input/Output
+1.65 V to +2.63 V Analog Supply
Advance Product Information
http://www.cirrus.com
This document contains information for a new product. Cirrus Logic reserves the right to modify this product without notice.
Copyright © Cirrus Logic, Inc. 2006 (All Rights Reserved)
DECEMBER '06 DS680A1
CS42L52
System Features
12, 24, and 27 MHz Master Clock Support in Addition to Typical Audio Clock Rates High Performance 24-bit Converters
– – Multi-bit Delta Sigma Architecture Very Low 64Fs Oversampling Clock Reduces Power Consumption Stereo Analog Passthru: 10 mW @ 1.8 V Stereo Playback: 14 mW @ 1.8 V Stereo Rec. and Playback: 23 mW @ 1.8 V 1.8 V to 2.5 V Digital & Analog 1.6 V to 5 V Class D Amplifier 1.8 V to 2.5 V Headphone Amplifier 1.8 V to 3.3 V Interface Logic ADC, DAC, CODEC, MIC Pre-Amplifier, PGA, Headphone Amplifier, Speaker Amplifier Line/Headphone Out = Analog In (ADC Bypassed) Line/Headphone/Speaker Out = ADC + Digital In Digital Out = ADC + Digital In Internal Digital Loopback Mono Mixes Master or Slave Operation High Impedance Digital Output Option (for easy MUXing between CODEC & other data sources) Quarter-Speed Mode - (i.e. allows 8 kHz Fs while maintaining a flat noise floor up to 16 kHz) 4 kHz to 96 kHz Sample Rates
General Description
The CS42L52 is a highly integrated, low power stereo CODEC with headphone and Class D speaker amplifiers. The CS42L52 offers many features suitable for low power, portable system applications. The ADC input path allows independent channel control of a number of features. Input summing amplifiers mix and select line-level and/or microphone level inputs for each channel. The microphone input path includes a selectable programmable-gain pre-amplifier stage and a low noise MIC bias voltage supply. A PGA is available for line or microphone inputs and provides analog gain with soft ramp and zero cross transitions. The ADC also features a digital volume control with soft ramp transitions. A programmable ALC and Noise Gate monitor the input signals and adjust the volume levels appropriately. To conserve power, the ADC may be bypassed while still allowing full analog volume control. The DAC output path includes a digital signal processing engine with various fixed function controls.Tone Control provides bass and treble adjustment of four selectable corner frequencies. The Digital Mixer provides independent volume control for both the ADC output and PCM input signal paths, as well as a master volume control. Digital Volume controls may be configured to change on soft ramp transitions while the analog controls can be configured to occur on every zero crossing. The DAC also includes de-emphasis, limiting functions and a BEEP generator delivering tones selectable across a range of two full octaves. The stereo headphone amplifier is powered from a separate positive supply and the integrated charge pump provides a negative supply. This allows a ground-centered analog output with a wide signal swing and eliminates external DC-blocking capacitors. The Class D stereo speaker amplifier does not require an external filter and provides the high efficiency amplification required by power sensitive portable applications. The speaker amplifier may be powered directly from a battery while the internal DC supply monitoring and compensation provides a constant gain level as the battery’s voltage decays. An internal temperature monitor alerts the user and automatically attenuates and/or shuts down the PWM speaker output when an overload condition causes temperatures to exceed safe operating levels. In addition to its many features, the CS42L52 operates from a low voltage analog and digital core making it ideal for portable systems that require extremely low power consumption in a minimal amount of space. The CS42L52 is available in a 40-pin QFN package in both Commercial (-40 to +85 °C) and Automotive (-40 to +105 °C) grades. The CS42L52 Customer Demonstration board is also available for device evaluation and implementation suggestions. Please refer to “Ordering Information” on page 82 for complete ordering information.
Low Power Operation
– – – – – – – –
Variable Power Supplies
Power Down Management
Analog & Digital Routing/Mixes:
– – – – – – –
Flexible Clocking Options
– –
I²C® Control Port Operation Temp. Monitor w/Thermal Foldback & Shutdown Headphone/Speaker Detection Input Pop and Click Suppression
Applications
Digital Voice Recorders, Digital Cameras & Camcorders PDA’s Personal Media Players Portable Game Consoles
2
DS680A1
CS42L52
TABLE OF CONTENTS
1. PIN DESCRIPTIONS .............................................................................................................................. 8 1.1 I/O Pin Characteristics ...................................................................................................................... 9 2. TYPICAL CONNECTION DIAGRAM ................................................................................................... 10 3. CHARACTERISTIC AND SPECIFICATIONS ...................................................................................... 11 RECOMMENDED OPERATING CONDITIONS ................................................................................... 11 ABSOLUTE MAXIMUM RATINGS ....................................................................................................... 11 ANALOG INPUT CHARACTERISTICS (COMMERCIAL - CNZ) .......................................................... 12 ANALOG INPUT CHARACTERISTICS (AUTOMOTIVE - DNZ) .......................................................... 13 ADC DIGITAL FILTER CHARACTERISTICS ....................................................................................... 14 ANALOG OUTPUT CHARACTERISTICS (COMMERCIAL - CNZ) ...................................................... 15 ANALOG OUTPUT CHARACTERISTICS (AUTOMOTIVE - DNZ) ...................................................... 16 ANALOG PASSTHRU CHARACTERISTICS ....................................................................................... 17 PWM OUTPUT CHARACTERISTICS (Note 9) .................................................................................... 17 LINE OUTPUT VOLTAGE LEVEL CHARACTERISTICS ..................................................................... 18 HEADPHONE OUTPUT POWER CHARACTERISTICS ...................................................................... 19 COMBINED DAC INTERPOLATION & ON-CHIP ANALOG FILTER RESPONSE .............................. 20 SWITCHING SPECIFICATIONS - SERIAL PORT ............................................................................... 21 SWITCHING SPECIFICATIONS - I²C CONTROL PORT ..................................................................... 22 DC ELECTRICAL CHARACTERISTICS .............................................................................................. 23 DIGITAL INTERFACE SPECIFICATIONS & CHARACTERISTICS ..................................................... 23 POWER CONSUMPTION .................................................................................................................... 24 4. APPLICATIONS ................................................................................................................................... 25 4.1 Overview ......................................................................................................................................... 25 4.1.1 Basic Architecture ................................................................................................................. 25 4.1.2 Line & MIC Inputs .................................................................................................................. 25 4.1.3 Line & Headphone Outputs ................................................................................................... 25 4.1.4 Speaker Driver Outputs ......................................................................................................... 25 4.1.5 Fixed Function DSP Engine .................................................................................................. 25 4.1.6 Beep Generator ..................................................................................................................... 25 4.1.7 Power Management .............................................................................................................. 25 4.2 Analog Inputs ................................................................................................................................. 26 4.2.1 MIC Inputs ............................................................................................................................. 27 4.2.2 Automatic Level Control (ALC) .............................................................................................. 27 4.2.3 Noise Gate ............................................................................................................................ 28 4.3 Analog Outputs .............................................................................................................................. 29 4.3.1 Beep Generator ..................................................................................................................... 30 4.3.2 Limiter .................................................................................................................................... 31 4.4 Analog In to Analog Out Passthru .................................................................................................. 32 4.4.1 Overriding the ADC Power Down .......................................................................................... 32 4.4.2 Overriding the PGA Power Down .......................................................................................... 33 4.5 PWM Outputs ................................................................................................................................. 33 4.5.1 Mono Speaker Output Configuration ..................................................................................... 33 4.5.2 VP Battery Compensation ..................................................................................................... 33 4.5.2.1 Maintaining a Desired Output Level ........................................................................... 34 4.6 Serial Port Clocking ........................................................................................................................ 34 4.7 Digital Interface Formats ................................................................................................................ 36 4.7.1 DSP Mode ............................................................................................................................. 36 4.8 Initialization ..................................................................................................................................... 36 4.9 Recommended Power-Up Sequence ............................................................................................. 37 4.10 Recommended Power-Down Sequence ...................................................................................... 37 4.11 Control Port Operation .................................................................................................................. 38 4.11.1 I²C Control ........................................................................................................................... 38 DS680A1 3
CS42L52
4.11.2 Memory Address Pointer (MAP) .......................................................................................... 39 4.11.2.1 Map Increment (INCR) ............................................................................................. 39 5. REGISTER QUICK REFERENCE ........................................................................................................ 40 6. REGISTER DESCRIPTION .................................................................................................................. 42 6.1 Chip I.D. and Revision Register (Address 01h) (Read Only) ......................................................... 42 6.1.1 Chip I.D. (Read Only) ............................................................................................................ 42 6.1.2 Chip Revision (Read Only) .................................................................................................... 42 6.2 Power Control 1 (Address 02h) ...................................................................................................... 42 6.2.1 Power Down ADC Charge Pump .......................................................................................... 42 6.2.2 Power Down PGAx ................................................................................................................ 42 6.2.3 Power Down ADCx ................................................................................................................ 43 6.2.4 Power Down .......................................................................................................................... 43 6.3 Power Control 2 (Address 03h) ...................................................................................................... 43 6.3.1 Power Down ADC Override ................................................................................................... 43 6.3.2 Power Down MICx ................................................................................................................. 43 6.3.3 Power Down MIC Bias .......................................................................................................... 43 6.4 Power Control 3 (Address 04h) ...................................................................................................... 44 6.4.1 Headphone Power Control .................................................................................................... 44 6.4.2 Speaker Power Control ......................................................................................................... 44 6.5 Clocking Control (Address 05h) ...................................................................................................... 44 6.5.1 Auto-Detect ........................................................................................................................... 44 6.5.2 Speed Mode .......................................................................................................................... 45 6.5.3 32kHz Sample Rate Group ................................................................................................... 45 6.5.4 27 MHz Video Clock .............................................................................................................. 45 6.5.5 Internal MCLK/LRCK Ratio ................................................................................................... 45 6.5.6 MCLK Divide By 2 ................................................................................................................. 46 6.6 Interface Control 1 (Address 06h) .................................................................................................. 46 6.6.1 Master/Slave Mode ............................................................................................................... 46 6.6.2 SCLK Polarity ........................................................................................................................ 46 6.6.3 ADC Interface Format ........................................................................................................... 46 6.6.4 DSP Mode ............................................................................................................................. 46 6.6.5 DAC Interface Format ........................................................................................................... 47 6.6.6 Audio Word Length ................................................................................................................ 47 6.7 Interface Control 2 (Address 07h) .................................................................................................. 47 6.7.1 SCLK equals MCLK .............................................................................................................. 47 6.7.2 SDOUT to SDIN Digital Loopback ......................................................................................... 47 6.7.3 Tri-State Serial Port Interface ................................................................................................ 48 6.7.4 Speaker/Headphone Switch Invert ........................................................................................ 48 6.7.5 MIC Bias Level ...................................................................................................................... 48 6.8 Input x Select: ADCA and PGAA (Address 08h), ADCB and PGAB (Address 09h) ....................... 48 6.8.1 ADC Input Select ................................................................................................................... 48 6.8.2 PGA Input Mapping ............................................................................................................... 49 6.9 Analog & HPF Control (Address 0Ah) ............................................................................................ 49 6.9.1 ADCx High-Pass Filter .......................................................................................................... 49 6.9.2 ADCx High-Pass Filter Freeze .............................................................................................. 49 6.9.3 Ch. x Analog Soft Ramp ........................................................................................................ 49 6.9.4 Ch. x Analog Zero Cross ....................................................................................................... 49 6.10 ADC HPF Corner Frequency (Address 0Bh) ................................................................................ 50 6.10.1 HPF x Corner Frequency .................................................................................................... 50 6.11 Misc. ADC Control (Address 0Ch) ................................................................................................ 50 6.11.1 ADC Channel B=A .............................................................................................................. 50 6.11.2 Digital MUX ......................................................................................................................... 50 6.11.3 Digital Sum .......................................................................................................................... 50 6.11.4 Invert ADC Signal Polarity ................................................................................................... 50 4 DS680A1
CS42L52
6.11.5 ADC Mute ............................................................................................................................ 51 6.12 Playback Control 1 (Address 0Dh) ............................................................................................... 51 6.12.1 Headphone Analog Gain ..................................................................................................... 51 6.12.2 Playback Volume Setting B=A ............................................................................................ 51 6.12.3 Invert PCM Signal Polarity .................................................................................................. 51 6.12.4 Master Playback Mute ......................................................................................................... 51 6.13 Miscellaneous Controls (Address 0Eh) ........................................................................................ 52 6.13.1 Passthru Analog .................................................................................................................. 52 6.13.2 Passthru Mute ..................................................................................................................... 52 6.13.3 Freeze Registers ................................................................................................................. 52 6.13.4 HP/Speaker De-Emphasis .................................................................................................. 52 6.13.5 Digital Soft Ramp ................................................................................................................ 53 6.13.6 Digital Zero Cross ................................................................................................................ 53 6.14 Playback Control 2 (Address 0Fh) ................................................................................................ 53 6.14.1 Headphone Mute ................................................................................................................. 53 6.14.2 Speaker Mute ...................................................................................................................... 53 6.14.3 Speaker Volume Setting B=A .............................................................................................. 54 6.14.4 Speaker Channel Swap ....................................................................................................... 54 6.14.5 Speaker MONO Control ...................................................................................................... 54 6.14.6 Speaker Mute 50/50 Control ............................................................................................... 54 6.15 MICx Amp Control: MIC A (Address 10h) & MIC B (Address 11h) ...................................................................................... 54 6.15.1 MIC x Select ........................................................................................................................ 54 6.15.2 MICx Configuration .............................................................................................................. 55 6.15.3 MICx Gain ........................................................................................................................... 55 6.16 PGAx Vol. & ALCx Transition Ctl.: ALC, PGA A (Address 12h) & ALC, PGA B (Address 13h) .................................................................. 55 6.16.1 ALCx Soft Ramp Disable ..................................................................................................... 55 6.16.2 ALCx Zero Cross Disable .................................................................................................... 55 6.16.3 PGAx Volume ...................................................................................................................... 56 6.17 Passthru x Volume: PASSAVOL (Address 14h) & PASSBVOL (Address 15h) .......................... 56 6.17.1 Passthru x Volume .............................................................................................................. 56 6.18 ADCx Volume Control: ADCAVOL (Address 16h) & ADCBVOL (Address 17h) .......................... 57 6.18.1 ADCx Volume ...................................................................................................................... 57 6.19 ADCx Mixer Volume: ADCA (Address 18h) & ADCB (Address 19h) ............................................ 58 6.19.1 ADC Mixer Channel x Mute ................................................................................................. 58 6.19.2 ADC Mixer Channel x Volume ............................................................................................. 58 6.20 PCMx Mixer Volume: PCMA (Address 1Ah) & PCMB (Address 1Bh) .......................................... 58 6.20.1 PCM Mixer Channel x Mute ................................................................................................ 58 6.20.2 PCM Mixer Channel x Volume ............................................................................................ 58 6.21 Beep Frequency & On Time (Address 1Ch) ................................................................................. 59 6.21.1 Beep Frequency .................................................................................................................. 59 6.21.2 Beep On Time ..................................................................................................................... 60 6.22 Beep Volume & Off Time (Address 1Dh) ...................................................................................... 60 6.22.1 Beep Off Time ..................................................................................................................... 60 6.22.2 Beep Volume ....................................................................................................................... 61 6.23 Beep & Tone Configuration (Address 1Eh) .................................................................................. 61 6.23.1 Beep Configuration .............................................................................................................. 61 6.23.2 Beep Mix Disable ................................................................................................................ 61 6.23.3 Treble Corner Frequency .................................................................................................... 62 6.23.4 Bass Corner Frequency ...................................................................................................... 62 6.23.5 Tone Control Enable ........................................................................................................... 62 6.24 Tone Control (Address 1Fh) ......................................................................................................... 62 6.24.1 Treble Gain .......................................................................................................................... 62 DS680A1 5
CS42L52
6.24.2 Bass Gain ............................................................................................................................ 63 6.25 Master Volume Control: MSTA (Address 20h) & MSTB (Address 21h) ....................................... 63 6.25.1 Master Volume Control ........................................................................................................ 63 6.26 Headphone Volume Control: HPA (Address 22h) & HPB (Address 23h) ..................................... 63 6.26.1 Headphone Volume Control ................................................................................................ 63 6.27 Speaker Volume Control: SPKA (Address 24h) & SPKB (Address 25h) ...................................... 64 6.27.1 Speaker Volume Control ..................................................................................................... 64 6.28 ADC & PCM Channel Mixer (Address 26h) .................................................................................. 64 6.28.1 PCM Mix Channel Swap ..................................................................................................... 64 6.28.2 ADC Mix Channel Swap ...................................................................................................... 64 6.29 Limiter Control 1, Min/Max Thresholds (Address 27h) ................................................................. 65 6.29.1 Limiter Maximum Threshold ................................................................................................ 65 6.29.2 Limiter Cushion Threshold .................................................................................................. 65 6.29.3 Limiter Soft Ramp Disable ................................................................................................... 65 6.29.4 Limiter Zero Cross Disable .................................................................................................. 66 6.30 Limiter Control 2, Release Rate (Address 28h) ............................................................................ 66 6.30.1 Peak Detect and Limiter ...................................................................................................... 66 6.30.2 Peak Signal Limit All Channels ........................................................................................... 66 6.30.3 Limiter Release Rate ........................................................................................................... 66 6.31 Limiter Attack Rate (Address 29h) ................................................................................................ 67 6.31.1 Limiter Attack Rate .............................................................................................................. 67 6.32 ALC Enable & Attack Rate (Address 2Ah) ................................................................................... 67 6.32.1 ALCx Enable ....................................................................................................................... 67 6.32.2 ALC Attack Rate .................................................................................................................. 67 6.33 ALC Release Rate (Address 2Bh) ................................................................................................ 68 6.33.1 ALC Release Rate ............................................................................................................... 68 6.34 ALC Threshold (Address 2Ch) ..................................................................................................... 68 6.34.1 ALC Maximum Threshold .................................................................................................... 68 6.34.2 ALC Minimum Threshold ..................................................................................................... 69 6.35 Noise Gate Control (Address 2Dh) ............................................................................................... 69 6.35.1 Noise Gate All Channels ..................................................................................................... 69 6.35.2 Noise Gate Enable .............................................................................................................. 69 6.35.3 Noise Gate Threshold and Boost ........................................................................................ 70 6.35.4 Noise Gate Delay Timing .................................................................................................... 70 6.36 Status (Address 2Eh) (Read Only) ............................................................................................... 70 6.36.1 Serial Port Clock Error (Read Only) .................................................................................... 70 6.36.2 DSP Engine Overflow (Read Only) ..................................................................................... 71 6.36.3 PCMx Overflow (Read Only) ............................................................................................... 71 6.36.4 ADCx Overflow (Read Only) ............................................................................................... 71 6.37 Battery Compensation (Address 2Fh) .......................................................................................... 71 6.37.1 Battery Compensation ......................................................................................................... 71 6.37.2 VP Monitor ........................................................................................................................... 71 6.37.3 VP Reference ...................................................................................................................... 72 6.38 VP Battery Level (Address 30h) (Read Only) ............................................................................... 72 6.38.1 VP Voltage Level (Read Only) ............................................................................................ 72 6.39 Speaker Status (Address 31h) (Read Only) ................................................................................. 72 6.39.1 Speaker Current Load Status (Read Only) ......................................................................... 72 6.39.2 SPKR/HP Pin Status (Read Only) ....................................................................................... 73 6.39.3 Thermal Warning Status (Read Only) ................................................................................. 73 6.39.4 Thermal Error Status (Read Only) ....................................................................................... 73 6.40 Temperature Monitor Control (Address 32h) ................................................................................ 73 6.40.1 Temperature Acknowledge & Release ................................................................................ 73 6.40.2 Thermal Foldback (Address 33h) ........................................................................................ 73 6.40.3 Thermal Foldback ................................................................................................................ 73 6 DS680A1
CS42L52
6.40.4 Speaker Attenuation ............................................................................................................ 74 6.41 Charge Pump Frequency (Address 34h) ...................................................................................... 74 6.41.1 Charge Pump Frequency .................................................................................................... 74 7. ANALOG PERFORMANCE PLOTS .................................................................................................... 75 7.1 Headphone THD+N versus Output Power Plots ............................................................................ 75 8. EXAMPLE SYSTEM CLOCK FREQUENCIES .................................................................................... 77 8.1 Auto Detect Enabled .................................................................................................................... 77 8.2 Auto Detect Disabled .................................................................................................................... 77 9. PCB LAYOUT CONSIDERATIONS ..................................................................................................... 78 9.1 Power Supply, Grounding ............................................................................................................... 78 9.2 QFN Thermal Pad .......................................................................................................................... 78 10. ADC & DAC DIGITAL FILTERS ........................................................................................................ 79 11. PARAMETER DEFINITIONS .............................................................................................................. 80 12. PACKAGE DIMENSIONS .................................................................................................................. 81 THERMAL CHARACTERISTICS ........................................................................................................ 81 13. ORDERING INFORMATION .............................................................................................................. 82 14. REFERENCES .................................................................................................................................... 82 15. REVISION HISTORY .......................................................................................................................... 82
LIST OF FIGURES
Figure 1. Typical Connection Diagram ...................................................................................................... 10 Figure 2. Headphone Output Test Load .................................................................................................... 19 Figure 3. Serial Audio Interface Timing ..................................................................................................... 21 Figure 4. Control Port Timing - I²C ............................................................................................................ 22 Figure 5. Analog Input Signal Flow ........................................................................................................... 26 Figure 6. Single-Ended MIC Configuration ............................................................................................... 27 Figure 7. Differential MIC Configuration .................................................................................................... 27 Figure 8. ALC ............................................................................................................................................ 28 Figure 9. Noise Gate Attenuation .............................................................................................................. 28 Figure 10. DSP Engine Signal Flow .......................................................................................................... 29 Figure 11. PWM Output Stage .................................................................................................................. 30 Figure 12. Analog Output Stage ................................................................................................................ 30 Figure 13. Beep Configuration Options ..................................................................................................... 31 Figure 14. Peak Detect & Limiter .............................................................................................................. 32 Figure 15. Battery Compensation ............................................................................................................. 34 Figure 16. I²S Format ................................................................................................................................ 36 Figure 17. Left-Justified Format ................................................................................................................ 36 Figure 18. Right-Justified Format (DAC only) ........................................................................................... 36 Figure 19. DSP Mode Format) .................................................................................................................. 36 Figure 20. Control Port Timing, I²C Write .................................................................................................. 38 Figure 21. Control Port Timing, I²C Read .................................................................................................. 38 Figure 22. THD+N vs. Output Power per Channel at 1.8 V (16 Ω load) ................................................... 75 Figure 23. THD+N vs. Output Power per Channel at 2.5 V (16 Ω load) ................................................... 75 Figure 24. THD+N vs. Output Power per Channel at 1.8 V (32 Ω load) ................................................... 76 Figure 25. THD+N vs. Output Power per Channel at 2.5 V (32 Ω load) ................................................... 76 Figure 26. ADC Passband Ripple ............................................................................................................. 79 Figure 27. ADC Stopband Rejection ......................................................................................................... 79 Figure 28. ADC Transition Band ............................................................................................................... 79 Figure 29. ADC Transition Band Detail ..................................................................................................... 79 Figure 30. DAC Passband Ripple ............................................................................................................. 79 Figure 31. DAC Stopband ......................................................................................................................... 79 Figure 32. DAC Transition Band ............................................................................................................... 79 Figure 33. DAC Transition Band (Detail) ................................................................................................... 79 DS680A1 7
CS42L52 1. PIN DESCRIPTIONS
RESET SPKR/HP
32 31
SDOUT
SDIN SCLK
MCLK
LRCK
DGND
35
VD
34
40
38
39
37
36
33
VL
SDA SCL TSTN SPKR_OUTA+ VP SPKR_OUTASPKR_OUTB+ VP SPKR_OUTB-VHPFILT
1 2 3 4 5 6 7 8 9 10 12 14 16 17 18 19 11 13 15 20
30 29 28 27
AIN1B AIN1A AFILTB AFILTA AIN2B AIN2A AIN3B/MIC2-/MIC1B AIN3A/MIC1-/MIC1A AIN4B/MIC2+/MIC2B AIN4A/MIC1+/MIC2A
GND/Thermal Pad
26 25
Top-Down (Through-Package) View 40-Pin QFN Package
24 23 22 21
HP/LINE_OUTA
HP/LINE_OUTB
AGND
FLYN
FILT+
VQ
VA
Pin Name
SDA SCL TSTN SPKR_OUTA+ SPKR_OUTASPKR_OUTB+ SPKR_OUTBVP -VHPFILT FLYN FLYP +VHP HP/LINE_OUTB, A
#
1 2 3 4 6 7 9 5 8 10
Pin Description
Serial Control Data (Input/Output) - SDA is a data I/O in I²C Mode. Serial Control Port Clock (Input) - Serial clock for the serial control port. Test In - This pin is an input used for test purposes only. It must be tied to ground for normal operation. PWM Speaker Output (Output) - Full-bridge amplified PWM speaker outputs.
Power for PWM Drivers (Input) - Power supply for the PWM output driver stages.
Inverting Charge Pump Filter Connection (Output) - Power supply from the inverting charge pump that provides the negative rail for the headphone/line amplifiers. 11 Charge Pump Cap Negative Node (Output) - Negative node for the inverting charge pump’s flying capacitor. 12 Charge Pump Cap Positive Node (Output) - Positive node for the inverting charge pump’s flying capacitor. 13 Positive Analog Power for Headphone (Input) - Positive voltage rail and power for the internal headphone amplifiers and inverting charge pump. 14,15 Headphone/Line Audio Output (Output) - Stereo headphone or line level analog outputs.
8
MICBIAS
+VHP
FLYP
DS680A1
CS42L52
VA AGND FILT+ VQ MICBIAS AIN4A,B AIN3A,B MIC1+,MIC2+,MIC2A,B MIC1A,B AIN2A,B AIN1A,B AFILTA,B SPKR/HP RESET VL VD DGND SDOUT MCLK SCLK SDIN LRCK GND/Thermal Pad 16 17 18 19 20 21,22 23,24 21,23 22,24 21,22 23,24 25,26 29,30 27,28 31 32 33 34 35 36 37 38 39 40 Analog Power (Input) - Positive power for the internal analog section. Analog Ground (Input) - Ground reference for the internal analog section. Positive Voltage Reference (Output) - Positive reference voltage for the internal sampling circuits. Quiescent Voltage (Output) - Filter connection for the internal quiescent voltage. Microphone Bias (Output) - Low noise bias supply for an external microphone. Electrical characteristics are specified in the DC Electrical Characteristics table. Line-Level Analog Inputs (Input) - Single-ended stereo line-level analog inputs. Differential Microphone Inputs (Input) - Differential stereo microphone inputs. Single-Ended Microphone Inputs (Input) - Single-ended stereo microphone inputs. Line-Level Analog Inputs (Input) - Single-ended stereo line-level analog inputs. Anti-alias Filter Connection (Output) - Anti-alias filter connection for the ADC inputs. Speaker/Headphone Switch (Input) - Powers down the left and/or right channel of the speaker and/or headphone outputs. Reset (Input) - The device enters a low power mode when this pin is driven low. Digital Interface Power (Input) - Determines the required signal level for the serial audio interface and host control port. Digital Power (Input) - Positive power for the internal digital section. Digital Ground (Input) - Ground reference for the internal digital section. Serial Audio Data Output (Output) - Output for two’s complement serial audio data. Master Clock (Input) - Clock source for the delta-sigma modulators. Serial Clock (Input/Output) - Serial clock for the serial audio interface. Serial Audio Data Input (Input) - Input for two’s complement serial audio data. Left Right Clock (Input/Output) - Determines which channel, Left or Right, is currently active on the serial audio data line. Ground reference for PWM power FETs and charge pump; thermal relief pad for optimized heat dissipation.
1.1
I/O Pin Characteristics
Input and output levels and associated power supply voltage are shown in the table below. Logic levels should not exceed the corresponding power supply voltage.
Power Supply
Pin Name
I/O
Driver
1.65 V - 3.47 V, CMOS/Open Drain 1.65 V - 3.47 V, CMOS 1.65 V - 3.47 V, CMOS 1.65 V - 3.47 V V, CMOS 1.6 V - 5.25 V Power MOSFET 1.6 V - 5.25 V Power MOSFET 1.6 V - 5.25 V Power MOSFET 1.6 V - 5.25 V Power MOSFET
Receiver
1.65 V - 3.47 V, with Hysteresis 1.65 V - 3.47 V, with Hysteresis 1.65 V - 3.47 V, with Hysteresis 1.65 V - 3.47 V 1.65 V - 3.47 V 1.65 V - 3.47 V 1.65 V - 3.47 V 1.65 V - 2.63 V -
VL
VA VP
RESET Input SCL Input SDA Input/Output MCLK Input LRCK Input/Output SCLK Input/Output SDOUT Output SDIN Input SPKR/HP Input SPKR_OUTA+ Output SPKR_OUTAOutput SPKR_OUTB+ Output SPKR_OUTBOutput
DS680A1
9
CS42L52 2. TYPICAL CONNECTION DIAGRAM
+1.8 V to +2.5 V
1 µF 0.1 µF 0.1 µF 0.1 µF 1 µF
+1.8 V to +2.5 V
See Note 5
VD
VA
+VHP
47 kΩ
Line Level Out Left & Right
0.022 µF Note 1
1 µF
**
FLYP FLYN
HP/LINE_OUTB HP/LINE_OUTA
51.1 Ω
51.1 Ω 0.022 µF
Headphone Out Left & Right
Note 2
1 µF
**
-VHPFILT
SPKR/HP
CS42L52
* *Use low ESR ceramic capacitors.
VP
0.1 µF 10 µF
+1.6 V to Stereo Speakers +5 V
SPKR_OUTA+ SPKR_OUTAVP SPKR_OUTB+ SPKR_OUTBNote 4
0.1 µF
MCLK SCLK LRCK Digital Audio Processor SDIN SDOUT RESET SCL SDA
AIN1A
1800 pF * 1800 pF 100 Ω 1 µF 100 kΩ 100 kΩ 1 µF
Left 1 Analog Input 1 Right 1
*
AIN1B
100 Ω
AIN2A
1800 pF * 1800 pF 100 Ω 1 µF 100 kΩ 100 kΩ 1 µF
Left 2 Analog Input 2 Right 2
*
AIN2B
2 kΩ 2 kΩ
100 Ω
+1.8 V to +3.3 V
0.1 µF
VL
MIC1AIN3A/MIC1A 1 µF
Note 7
Microphone 1 MIC1+
AIN4A/MIC2A 1 µF 100 kΩ
Notes: 1. Recommended values for the default charge pump switching frequency. The required capacitance follows an inverse relationship with the charge pump’s switching frequency. When increasing the switching frequency, the capacitance may decrease; when lowering the switching frequency, the capacitance must increase. 2. Larger capacitance reduces the ripple on the internal amplifier’s supply. This may reduce the distortion at higher output power levels. 3. Additional bulk capacitance may be added to improve PSRR at low frequencies. 4. These capacitors serve as a charge reservoir for the internal switched capacitor ADC modulators. They are only needed when the PGA (Programmable Gain Amplifier) is bypassed. 5. Series resistance in the path of the power supplies must be avoided. Any voltage drop on VHP will directly impact the negative charge pump supply (-VHPFILT) and clip the audio output. 6. The value of RL, a current-limiting resistor used with electret condenser microphones, is dictated by the microphone cartridge. 7. The negative terminal of the MICx inputs connects to the ground pin of the microphone cartridge. Gain is applied only to the positive terminal.
MICBIAS
0.1 µF
RL RL
1 µF 100 kΩ
Mic-Level Inputs
Note 6
MIC2+
AIN4B/MIC2B
Microphone 2 MIC2AIN3B/MIC1B 1 µF Note 7
Note 3
AGND
*
150 pF
*
150 pF
1 µF
10 µF
AFILTA AFILTB VQ FILT+ DGND
* Capacitors must be C0G or equivalent
Figure 1. Typical Connection Diagram
10
DS680A1
CS42L52 3. CHARACTERISTIC AND SPECIFICATIONS RECOMMENDED OPERATING CONDITIONS
(AGND=DGND=0 V, all voltages with respect to ground.)
Parameters
DC Power Supply Analog Headphone Amplifier Speaker Amplifier Digital Serial/Control Port Interface Ambient Temperature
Symbol
VA +VHP VP VD VL Commercial - CNZ Automotive - DNZ TA
Min
1.65 1.65 1.60 1.65 1.65 -40 -40
Max
2.63 2.63 5.25 2.63 3.47 +85 +105
Units
V V V V V °C °C
ABSOLUTE MAXIMUM RATINGS
(AGND = DGND = 0 V; all voltages with respect to ground.)
Parameters
DC Power Supply Analog Speaker Digital Serial/Control Port Interface (Note 1) (Note 2) (Note 2)
Symbol
VA, VHP VP VD VL Iin
VIN
Min
-0.3 -0.3 -0.3 -0.3 AGND-0.7 -0.3 -50 -65
Max
3.0 5.5 3.0 4.0 ±10 VA+0.7 VL+ 0.4 +115 +150
Units
V V V V mA
V
Input Current Analog Input Voltage
Digital Input Voltage Ambient Operating Temperature (power applied) Storage Temperature
VIND TA Tstg
V °C °C
WARNING: Operation at or beyond these limits may result in permanent damage to the device. Normal operation is not guaranteed at these extremes. Notes: 1. Any pin except supplies. Transient currents of up to ±100 mA on the analog input pins will not cause SCR latch-up. 2. The maximum over/under voltage is limited by the input current.
DS680A1
11
CS42L52 ANALOG INPUT CHARACTERISTICS (COMMERCIAL - CNZ)
(Test Conditions (unless otherwise specified): Input sine wave (relative to digital full-scale): 1 kHz through passive input filter; VL = VD = VHP = 1.8 V; TA = +25°C; Measurement Bandwidth is 10 Hz to 20 kHz unless otherwise specified. Sample Frequency = 48 kHz)
Parameters
Analog In to ADC (PGA bypassed) Dynamic Range Total Harmonic Distortion + Noise A-weighted unweighted -1 dBFS -20 dBFS -60 dBFS A-weighted unweighted A-weighted unweighted
Min
93 90 92 89 85 82
VA = 2.5V Typ
99 96 -86 -76 -36 98 95 91 88 -88 -35 -85 86 83 -76 78 74 -74 0.2 ±100 352 90 100 70
Max
-80 -30 -82 -29 -79 -
Min
90 87 89 86 82 79 0.73•VA 0.73•VA
VA = 1.8V Typ
96 93 -84 -73 -33 95 92 88 85 -86 -32 -83 83 80 -74 75 71 -71 0.2 ±100 352 90 100 70 60 0.769•VA 0.770•VA 0.194•VA 0.115•VA 0.019•VA 20 39 50
Max
-78 -27 -80 -26 -77 0.83•VA 0.83•VA
Unit
dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB ppm/°C LSB dB dB dB dB Vpp Vpp Vpp Vpp kΩ kΩ kΩ
Analog In to PGA to ADC Dynamic Range PGA Setting: 0 dB PGA Setting: +12 dB Total Harmonic Distortion + Noise PGA Setting: 0 dB
-1 dBFS -60 dBFS PGA Setting: +12 dB -1 dBFS Analog In to MIC Pre-Amp (+16 dB) to PGA to ADC Dynamic Range PGA Setting: 0 dB A-weighted unweighted Total Harmonic Distortion + Noise PGA Setting: 0 dB -1 dBFS Analog In to MIC Pre-Amp (+32 dB) to PGA to ADC Dynamic Range PGA Setting: 0 dB A-weighted unweighted Total Harmonic Distortion + Noise PGA Setting: 0 dB -2 dBFS Other Characteristics DC Accuracy Interchannel Gain Mismatch Gain Drift Offset Error SDOUT Code with HPF On Input Interchannel Isolation HP Amp to Analog Input Isolation RL = 10 kΩ (Note 3) RL = 16 Ω Speaker Amp to Analog Input Isolation Full-scale Input Voltage ADC 0.73•VA PGA (0 dB) 0.73•VA PGA (+12 dB) MIC (+16 dB) MIC (+32 dB) Input Impedance (Note 4) ADC PGA MIC -
60 0.769•VA 0.83•VA 0.770•VA 0.83•VA 0.194•VA 0.115•VA 0.019•VA 20 39 50 -
-
-
3. Measured with DAC delivering full-scale output into specified load. 4. Measured between analog input and AGND.
12
DS680A1
CS42L52 ANALOG INPUT CHARACTERISTICS (AUTOMOTIVE - DNZ)
(Test Conditions (unless otherwise specified): Input sine wave (relative to full-scale): 1 kHz through passive input filter; VL = VD = VHP = 1.8 V; TA = -40 to +85°C; Measurement Bandwidth is 10 Hz to 20 kHz unless otherwise specified. Sample Frequency = 48 kHz)
Parameters
Analog In to ADC Dynamic Range Total Harmonic Distortion + Noise A-weighted unweighted -1 dBFS -20 dBFS -60 dBFS
VA = 2.37 - 2.63 V Min Typ Max
91 88 99 96 -86 -76 -36 -78 -28
VA = 1.65 - 1.89 V Min Typ Max
88 85 96 93 -84 -73 -33 -76 -25
Unit
dB dB dB dB dB
Analog In to PGA to ADC Dynamic Range PGA Setting: 0 dB PGA Setting: +12 dB Total Harmonic Distortion + Noise PGA Setting: 0 dB
A-weighted unweighted A-weighted unweighted
90 87 83 80 -
98 95 91 88 -88 -35 -85
-80 -27 -77
87 84 80 77 -
95 92 88 85 -86 -32 -83
-78 -24 -75
dB dB dB dB dB dB dB
-1 dBFS -60 dBFS PGA Setting: +12 dB -1 dBFS Analog In to MIC Pre-Amp (+16 dB) to PGA to ADC Dynamic Range PGA Setting: 0 dB A-weighted unweighted Total Harmonic Distortion + Noise PGA Setting: 0 dB -1 dBFS Analog In to MIC Pre-Amp (+32 dB) to PGA to ADC Dynamic Range PGA Setting: 0 dB A-weighted unweighted Total Harmonic Distortion + Noise PGA Setting: 0 dB -2 dBFS Other Characteristics DC Accuracy Interchannel Gain Mismatch Gain Drift Offset Error SDOUT Code with HPF On Input Interchannel Isolation HP Amp to Analog Input Isolation RL = 10 kΩ (Note 3) RL = 16 Ω Speaker Amp to Analog Input Isolation Full-scale Input Voltage
-
86 83 -76
-
-
83 80 -74
-
dB dB dB
-
78 74 -74
-
-
75 71 -71
-
dB dB dB
-
0.1 ±100 352 90 100 70 60 0.769•VA 0.770•VA 0.194•VA 0.115•VA 0.019•VA -
0.83•VA 0.83•VA
0.73•VA 0.73•VA
0.1 ±100 352 90 100 70 60 0.769•VA 0.770•VA 0.194•VA 0.115•VA 0.019•VA -
0.83•VA 0.83•VA
dB ppm/°C LSB dB dB dB dB Vpp Vpp Vpp Vpp kΩ kΩ kΩ
Input Impedance (Note 4)
ADC 0.73•VA PGA (0 dB) 0.73•VA PGA (+12 dB) MIC (+16 dB) MIC (+32 dB) ADC 18 PGA 40 MIC 50
-
18 40 50
-
DS680A1
13
CS42L52 ADC DIGITAL FILTER CHARACTERISTICS
Parameters (Note 5)
Passband (Frequency Response) Passband Ripple Stopband Stopband Attenuation Total Group Delay High-Pass Filter Characteristics (48 kHz Fs) Frequency Response Phase Deviation Passband Ripple Filter Settling Time @ 20 Hz -3.0 dB -0.13 dB 3.6 24.2 10 105/Fs 0.17 0 Hz Hz Deg dB s to -0.1 dB corner
Min
0 -0.09 0.6 33 -
Typ
7.6/Fs
Max
0.4948 0.17 -
Unit
Fs dB Fs dB s
5. Response is clock-dependent and will scale with Fs. Note that the response plots (Figures 26 to 29 on page 79) have been normalized to Fs and can be de-normalized by multiplying the X-axis scale by Fs. HPF parameters are for Fs = 48 kHz.
14
DS680A1
CS42L52 ANALOG OUTPUT CHARACTERISTICS (COMMERCIAL - CNZ)
(Test conditions (unless otherwise specified): Input test signal is a full-scale 997 Hz sine wave; VL = VD = VHP = 1.8 V; TA = +25°C; Measurement bandwidth is 10 Hz to 20 kHz; Sample Frequency = 48 kHz; test load RL = 10 kΩ, CL = 10 pF for the line output (see Figure 2), and test load RL = 16 Ω, CL = 10 pF (see Figure 2) for the headphone output. HP_GAIN[2:0] = 011.)
Parameters (Note 6) RL = 1 0 k Ω
Dynamic Range 18 to 24-Bit 16-Bit Total Harmonic Distortion + Noise 18 to 24-Bit A-weighted unweighted A-weighted unweighted 0 dB -20 dB -60 dB 0 dB -20 dB -60 dB
VA = 2.5 V Min Typ Max
VA = 1.8 V Min Typ Max
Unit
92 89 -
98 95 96 93 -86 -75 -35 -86 -73 -33
-80 -29 -
89 86 -
95 92 93 90 -88 -72 -32 -88 -70 -30
-82 -26 -
dB dB dB dB dB dB dB dB dB dB
16-Bit
RL = 1 6 Ω
Dynamic Range 18 to 24-Bit 16-Bit Total Harmonic Distortion + Noise 18 to 24-Bit A-weighted unweighted A-weighted unweighted 0 dB -20 dB -60 dB 0 dB -20 dB -60 dB 92 89 98 95 96 93 -75 -75 -35 -75 -73 -33 -69 -29 89 86 95 92 93 90 -75 -72 -32 -75 -70 -30 -69 -26 dB dB dB dB dB dB dB dB dB dB
16-Bit
Other Characteristics for RL = 16 Ω or 10 kΩ Output Parameters Modulation Index (MI) 0.6787 0.6787 (Note 7) Analog Gain Multiplier (G) 0.6047 0.6047 Full-scale Output Voltage (2•G•MI•VA) (Note 7) Refer to Table “Line Output Voltage Level CharacterisVpp tics” on page 18 Full-scale Output Power (Note 7) Refer to Table “Headphone Output Power Characteristics” on page 19 Interchannel Isolation (1 kHz) 16 Ω 80 80 dB 10 kΩ 95 93 dB Speaker Amp to HP Amp Isolation 80 80 dB Interchannel Gain Mismatch 0.1 0.25 0.1 0.25 dB Gain Drift ±100 ±100 ppm/°C AC-Load Resistance (RL) (Note 8) 16 16 Ω Load Capacitance (CL) (Note 8) 150 150 pF
6. One-half LSB of triangular PDF dither is added to data. 7. Full-scale output voltage and power is determined by the gain setting, G, in register “Headphone Analog Gain” on page 51. High gain settings at certain VA and VHP supply levels may cause clipping when the audio signal approaches full-scale, maximum power output, as shown in Figures 22 - 25 on page 76.
DS680A1
15
CS42L52 ANALOG OUTPUT CHARACTERISTICS (AUTOMOTIVE - DNZ)
(Test conditions (unless otherwise specified): Input test signal is a full-scale 997 Hz sine wave; VL = VD = VHP = 1.8 V; TA = -40 to +85°C; Measurement bandwidth is 10 Hz to 20 kHz; Sample Frequency = 48 kHz and 96 kHz; test load RL = 10 kΩ, CL = 10 pF for the line output (see Figure 2), and test load RL = 16 Ω, CL = 10 pF (see Figure 2) for the headphone output. HPGAIN[2:0] = 011.)
Parameters (Note 6) R L = 10 k Ω
Dynamic Range 18 to 24-Bit 16-Bit Total Harmonic Distortion + Noise 18 to 24-Bit A-weighted unweighted A-weighted unweighted 0 dB -20 dB -60 dB 0 dB -20 dB -60 dB
VA = 2.37 - 2.5 V Min Typ Max
VA = 1.65 - 1.89 V Min Typ Max
Unit
90 87 -
98 95 96 93 -86 -75 -35 -86 -73 -33
-78 -27 -
87 84 -
95 92 93 90 -88 -72 -32 -88 -70 -30
-80 -24 -
dB dB dB dB dB dB dB dB dB dB
16-Bit
RL = 16 Ω Dynamic Range 18 to 24-Bit 16-Bit Total Harmonic Distortion + Noise 18 to 24-Bit A-weighted unweighted A-weighted unweighted 0 dB -20 dB -60 dB 0 dB -20 dB -60 dB 90 87 98 95 96 93 -75 -75 -35 -75 -73 -33 -67 -27 87 84 95 92 93 90 -75 -72 -32 -75 -70 -30 -67 -24 dB dB dB dB dB dB dB dB dB dB
16-Bit
Other Characteristics for RL = 16 Ω or 10 kΩ Output Parameters Modulation Index (MI) 0.6787 0.6787 (Note 7) Analog Gain Multiplier (G) 0.6047 0.6047 Full-scale Output Voltage (2•G•MI•VA) (Note 7) Refer to the table in “Line Output Voltage Level CharacVpp teristics” on page 18 Full-scale Output Power (Note 7) Refer to the table in “Headphone Output Power Characteristics” on page 19 Interchannel Isolation (1 kHz) 16 Ω 80 80 dB 10 kΩ 95 93 dB Speaker Amp to HP Amp Isolation 80 80 dB Interchannel Gain Mismatch 0.1 0.25 0.1 0.25 dB Gain Drift ±100 ±100 ppm/°C AC-Load Resistance (RL) (Note 8) 16 16 Ω Load Capacitance (CL) (Note 8) 150 150 pF
8. See Figure 2. RL and CL reflect the recommended minimum resistance and maximum capacitance required for the internal op-amp's stability and signal integrity. In this circuit topology, CL will effectively move the band-limiting pole of the amp in the output stage. Increasing this value beyond the recommended 150 pF can cause the internal op-amp to become unstable.
16
DS680A1
CS42L52 ANALOG PASSTHRU CHARACTERISTICS
(Test Conditions (unless otherwise specified): Input sine wave (relative to full-scale): 1 kHz through passive input filter; VL = VD = VHP = 1.8 V; TA = +25°C; Measurement Bandwidth is 10 Hz to 20 kHz unless otherwise specified. Sample Frequency = 48 kHz)
Parameters
Analog In to HP/Line Amp Dynamic Range Total Harmonic Distortion + Noise A-weighted unweighted -1 dBFS -20 dBFS -60 dBFS
Min
-
VA = 2.5 V Typ
96 93 -80 -73 -33 0/-0.3
Max
-
Min
-
VA = 1.8 V Typ
94 91 -80 -71 -31 0/-0.3
Max
-
Unit
dB dB dB dB dB dB
Passband Ripple
PWM OUTPUT CHARACTERISTICS (Note 9)
(Test conditions (unless otherwise specified): Input test signal is a full scale 997 Hz signal; measurement bandwidth is 10 Hz to 20 kHz; MCLK = 12.2880 MHz, Sample Frequency = 48 kHz; test load RL = 8 Ω for stereo full-bridge, RL = 4 Ω for mono parallel full-bridge; VD = VL = VA = VHP = 1.8V; PWM Modulation Index of 0.85, PWM Switch Rate = 384 kHz)
Parameters (Note 10)
VP = 5.0 V Power Output per Channel Stereo Full-Bridge Mono Parallel Full-Bridge
Symbol
PO
Conditions
Min
Typ
Max
Units
THD+N < 10% THD+N < 1% THD+N < 10% THD+N < 1% PO = 0 dBFS = 0.8W PO = -3 dBFS = 0.75 W PO = 0 dBFS = 1.5 W PO = -60 dBFS, A-Weighted PO = -60 dBFS, Unweighted PO = -60 dBFS, A-Weighted PO = -60 dBFS, Unweighted PO THD+N < 10% THD+N < 1% THD+N < 10% THD+N < 1% PO = 0 dBFS = 0.43 W PO = -3 dBFS = 0.41 W PO = 0 dBFS = 0.81 W PO = -60 dBFS, A-Weighted PO = -60 dBFS, Unweighted PO = -60 dBFS, A-Weighted PO = -60 dBFS, Unweighted
-
1.00 0.80 1.90 1.50 0.52 0.10 0.50 91 88 91 88
-
Wrms Wrms Wrms Wrms % % % dB dB dB dB
Total Harmonic Distortion + Noise THD+N Stereo Full-Bridge Mono Parallel Full-Bridge Dynamic Range Stereo Full-Bridge Mono Parallel Full-Bridge VP = 3.7 V Power Output per Channel Stereo Full-Bridge Mono Parallel Full-Bridge Total Harmonic Distortion + Noise THD+N Stereo Full-Bridge Mono Parallel Full-Bridge Dynamic Range Stereo Full-Bridge Mono Parallel Full-Bridge DR DR
-
0.55 0.45 1.00 0.84 0.54 0.09 0.45 91 88 95 92
-
Wrms Wrms Wrms Wrms % % % dB dB dB dB
DS680A1
17
CS42L52
Parameters (Note 10)
VP =2.5 V Power Output per Channel Stereo Full-Bridge Mono Parallel Full-Bridge Total Harmonic Distortion + Noise THD+N Stereo Full-Bridge Mono Parallel Full-Bridge Dynamic Range Stereo Full-Bridge Mono Parallel Full-Bridge MOSFET On Resistance MOSFET On Resistance MOSFET On Resistance Efficiency Output Operating Peak Current RDS(ON) RDS(ON) RDS(ON) η IPC DR PO = -60 dBFS, A-Weighted PO = -60 dBFS, Unweighted PO = -60 dBFS, A-Weighted PO = -60 dBFS, Unweighted VP = 5.0V, Id = 0.5 A VP = 3.7V, Id = 0.5 A VP = 2.5V, Id = 0.5 A VP = 5.0 V, PO = 2 x 0.8 W, RL = 8Ω 91 88 94 91 600 640 760 82 1.5 dB dB dB dB mΩ mΩ mΩ % A
Symbol
PO
Conditions
Min
Typ
Max
Units
THD+N < 10% THD+N < 1% THD+N < 10% THD+N < 1% PO = 0 dBFS = 0.18 W PO = -3 dBFS = 0.17 W PO = 0 dBFS = 0.35 W
-
0.23 0.19 0.44 0.35 0.50 0.08 0.43
-
Wrms Wrms Wrms Wrms % % %
9. The PWM driver should be used in captive speaker systems only. 10. Optimal PWM performance is achieved when MCLK > 12 MHz.
LINE OUTPUT VOLTAGE LEVEL CHARACTERISTICS
Test conditions (unless otherwise specified): Input test signal is a full-scale 997 Hz sine wave; measurement bandwidth is 10 Hz to 20 kHz; Sample Frequency = 48 kHz; test load RL = 10 kΩ, CL = 10 pF (see Figure 2).
Parameters Min
AOUTx Voltage Into RL = 10 kΩ HP_GAIN[2:0] 000 001 010 011 (default) 100 101 110 111 Analog Gain (G) 0.3959 0.4571 0.5111 0.6047 0.7099 0.8399 1.0000 1.1430 VHP 1.8 V 2.5 V 1.8 V 2.5 V 1.8 V 2.5 V 1.8 V 2.5 V 1.8 V 2.5 V 1.8 V 2.5 V 1.8 V 2.5 V 1.8 V 2.5 V 1.95 -
VA = 2.5V Typ
Max
Min
VA = 1.8V Typ
Unit Max
1.34 1.34 1.55 1.55 1.73 1.73 2.05 2.05 2.41 2.41 2.85 2.85 3.39 3.39 (See (Note 11) 3.88
2.15 -
1.41 -
0.97 0.97 1.12 1.12 1.25 1.25 1.48 1.48 1.73 1.73 2.05 2.05 2.44 2.44 2.79 2.79
1.55 -
Vpp Vpp Vpp Vpp Vpp Vpp Vpp Vpp Vpp Vpp Vpp Vpp Vpp Vpp Vpp Vpp
18
DS680A1
CS42L52 HEADPHONE OUTPUT POWER CHARACTERISTICS
Test conditions (unless otherwise specified): Input test signal is a full-scale 997 Hz sine wave; measurement bandwidth is 10 Hz to 20 kHz; Sample Frequency = 48 kHz; test load RL = 16 Ω, CL = 10 pF (see Figure 2).
Parameters Min AOUTx Power Into RL = 16 Ω
HP_GAIN[2:0] 000 001 010 011 (default) 100 101 Analog Gain (G) 0.3959 0.4571 0.5111 0.6047 0.7099 0.8399 VHP 1.8 V 2.5 V 1.8 V 2.5 V 1.8 V 2.5 V 1.8 V 2.5 V 1.8 V 2.5 V 1.8 V 2.5 V 1.8 V 2.5 V 1.8 V 2.5 V -
VA = 2.5V Typ
Max
Min
VA = 1.8V Typ
Unit Max
110 111
1.0000 1.1430
7 7 10 10 12 12 17 17 23 23 (Note 7) See Figure 22 on page 75 32 (Note 7, 11) See Figures 22 and 23 on page 75
14 14 19 19 23 23 (Note 11) 32 (Note 11) 44
-
mWrms mWrms mWrms mWrms mWrms mWrms mWrms mWrms mWrms mWrms mWrms mWrms mWrms mWrms mWrms mWrms
11. VHP settings lower than VA reduces the headroom of the headphone amplifier. As a result, the DAC may not achieve the full THD+N performance at full-scale output voltage and power.
AOUTx
51 Ω 0.022 μ F
C
L
R
L
AGND
Figure 2. Headphone Output Test Load
DS680A1
19
CS42L52 COMBINED DAC INTERPOLATION & ON-CHIP ANALOG FILTER RESPONSE
Parameters (Note 12)
Frequency Response 10 Hz to 20 kHz Passband StopBand StopBand Attenuation (Note 13) Group Delay De-emphasis Error Fs = 32 kHz Fs = 44.1 kHz Fs = 48 kHz to -0.05 dB corner to -3 dB corner
Min
-0.01 0 0 0.5465 50 -
Typ
9/Fs -
Max
+0.08 0.4780 0.4996 +1.5/+0 +0.05/-0.25 -0.2/-0.4
Unit
dB Fs Fs Fs dB s dB dB dB
12. Response is clock dependent and will scale with Fs. Note that the response plots (Figures 30 and 33 on page 79) have been normalized to Fs and can be de-normalized by multiplying the X-axis scale by Fs. 13. Measurement Bandwidth is from Stopband to 3 Fs.
20
DS680A1
CS42L52 SWITCHING SPECIFICATIONS - SERIAL PORT
(Inputs: Logic 0 = DGND, Logic 1 = VL, SDOUT CLOAD = 15 pF.)
Parameters RESET pin Low Pulse Width
MCLK Frequency (Note 15) MCLK Duty Cycle (Note 14)
Symbol
Min
Max
Units
ms MHz % kHz % Hz % ns ns ns ns ns ns Hz % MHz Hz Hz % ns ns ns ns ns
1 (See “Serial Port Clocking” on page 34) 45 55 Fs 1/tP ts(LK-SK) td(MSB) (See “Serial Port Clocking” on page 34) 45 55 64•Fs 45 55 40 52 20 30 20 20 (See “Serial Port Clocking” on page 34) 45 55 12.0000 68•Fs 64•Fs 45 55 52 20 30 20 20 -
Slave Mode
Input Sample Rate (LRCK) LRCK Duty Cycle SCLK Frequency SCLK Duty Cycle LRCK Setup Time Before SCLK Rising Edge LRCK Edge to SDOUT MSB Output Delay SDOUT Setup Time Before SCLK Rising Edge SDOUT Hold Time After SCLK Rising Edge SDIN Setup Time Before SCLK Rising Edge SDIN Hold Time After SCLK Rising Edge
Master Mode
Output Sample Rate (LRCK) LRCK Duty Cycle SCLK Frequency All Speed Modes
ts(SDO-SK) th(SK-SDO) ts(SD-SK) th Fs 1/tP 1/tP 1/tP td(MSB) ts(SDO-SK) th(SK-SDO) ts(SD-SK) th
SCLK=MCLK mode MCLK=12.0000 MHz all other modes
SCLK Duty Cycle LRCK Edge to SDOUT MSB Output Delay SDOUT Setup Time Before SCLK Rising Edge SDOUT Hold Time After SCLK Rising Edge SDIN Setup Time Before SCLK Rising Edge SDIN Hold Time After SCLK Rising Edge
14. After powering up the CS42L52, RESET should be held low after the power supplies and clocks are settled. 15. See “Example System Clock Frequencies” on page 77 for typical MCLK frequencies.
LRCK
ts(LK-SK)
// // // // td(MSB) th(SK-SDO) // MSB // th // MSB // ts(SDO-SK) MSB-1 tP
SCLK
SDOUT
ts(SD-SK)
SDIN
MSB-1
Figure 3. Serial Audio Interface Timing
DS680A1
21
CS42L52 SWITCHING SPECIFICATIONS - I²C CONTROL PORT
(Inputs: Logic 0 = DGND, Logic 1 = VL, SDA CL = 30 pF)
Parameters
SCL Clock Frequency RESET Rising Edge to Start Bus Free Time Between Transmissions Start Condition Hold Time (prior to first clock pulse) Clock Low time Clock High Time Setup Time for Repeated Start Condition SDA Hold Time from SCL Falling SDA Setup time to SCL Rising Rise Time of SCL and SDA Fall Time SCL and SDA Setup Time for Stop Condition Acknowledge Delay from SCL Falling
Symbol
fscl tirs tbuf thdst tlow thigh tsust thdd tsud trc tfc tsusp tack
Min
500 4.7 4.0 4.7 4.0 4.7 0 250 4.7 300
Max
100 1 300 1000
Unit
kHz ns µs µs µs µs µs µs ns µs ns µs ns
(Note 16)
16. Data must be held for sufficient time to bridge the transition time, tfc, of SCL.
RST t irs Stop SDA t buf
SCL Repeated Start
Start
Stop
t hdst
t high
t
hdst
tf
t susp
t
low
t
hdd
t sud
t sust
tr
Figure 4. Control Port Timing - I²C
22
DS680A1
CS42L52 DC ELECTRICAL CHARACTERISTICS
(AGND = 0 V; all voltages with respect to ground.)
Parameters
VQ Characteristics Nominal Voltage Output Impedance DC Current Source/Sink MIC BIAS Characteristics Nominal Voltage MICBIAS_LVL[1:0] = 00 MICBIAS_LVL[1:0] = 01 MICBIAS_LVL[1:0] = 10 MICBIAS_LVL[1:0] = 11 1 kHz PGA to ADC ADC DAC (HP & Line Amps) PGA to ADC(Note 18) ADC DAC (HP & Line Amps) Full-Bridge PWM Outputs
Min
-
Typ
0.5•VA 23 0.8•VA 0.7•VA 0.6•VA 0.5•VA 50 44 60 60 22 42 60 56
Max
1 1 -
Units
V kΩ μA V V V V mA dB dB dB dB dB dB dB dB
DC Output Current Power Supply Rejection Ratio (PSRR) Power Supply Rejection Ratio Characteristics PSRR @1 kHz (Note 17)
PSRR @60 Hz (Note 17)
PSRR @217 Hz
17. Valid with the recommended capacitor values on FILT+ and VQ. Increasing the capacitance will also increase the PSRR. 18. The PGA is biased with VQ, created from a resistor divider from the VA supply. Increasing the capacitance on VQ will also increase the PSRR at low frequencies. A 10 µF capacitor on VQ improves the PSRR to 42 dB.
DIGITAL INTERFACE SPECIFICATIONS & CHARACTERISTICS
Parameters (Note 19)
Input Leakage Current Input Capacitance 1.8 V - 3.3 V Logic High-Level Output Voltage (IOH = -100 μA) Low-Level Output Voltage (IOL = 100 μA) High-Level Input Voltage VL = 1.65 V VL = 1.8 V VL = 2.0 V VL > 2.0 V VOH VOL VIH VL - 0.2 0.83•VL 0.76•VL 0.68•VL\ 0.65•VL 0.2 V V V
Symbol
Iin
Min
-
Max
±10 10
Units
μA pF
Low-Level Input Voltage
VIL
0.35•VL
V
19. See “I/O Pin Characteristics” on page 9 for serial and control port power rails.
DS680A1
23
CS42L52 POWER CONSUMPTION See (Note 20).
Operation 02h Power Ctl. Registers 03h 04h PDN_SPKB[1:0] PDN_SPKA[1:0] PDN_HPA[1:0] Typical Current (mA) PDN_PGAB PDN_PGAA PDN_ADCB PDN_ADCA PDN PDN_MICB PDN_MICA PDN_MICBIAS PDN_HPB[1:0]
iVHP
iVA
iVD
VL=3.3V (Note 23)
iVL
VP=3.7V
iVP
Total Power (mWrms)
V
1 2 3
Off (Note 21) Standby (Note 22) Mono Record
xxxxxxxxx xxxx1xxxx
x x
x x
x x
ADC 1 1 1 0 0 1 1 1 11 11 11 11 PGA to ADC 1 0 1 0 0 1 1 1 11 11 11 11
MIC to PGA to ADC 1 0 1 0 0 1 0 0 11 11 11 11 (with Bias) MIC to PGA to ADC 1 0 1 0 0 1 0 1 11 11 11 11 (no Bias)
4
Stereo Record
ADC 1 1 0 0 0 1 1 1 11 11 11 11 PGA to ADC 0 0 0 0 0 1 1 1 11 11 11 11
MIC to PGA to ADC 0 0 0 0 0 0 0 1 11 11 11 11 (no Bias)
5 6 7 8 9
Mono Playback to Headphone Mono Playback to Speaker Stereo Playback to Headphone Stereo Playback to Speaker Stereo Passthru to Headphone
1 1 1 1 0 1 1 1 10 11 11 11 1 1 1 1 0 1 1 1 11 11 10 10 1 1 1 1 0 1 1 1 10 10 11 11 1 1 1 1 0 1 1 1 11 11 10 10 1 1 1 1 0 1 1 1 10 10 11 11 1 0 1 0 0 1 1 1 11 10 11 11 1 0 1 0 0 1 0 0 11 10 11 11 0 0 0 0 0 1 1 1 10 10 11 11 0 0 0 0 0 1 1 1 10 10 10 10
10 Mono Record & Playback
PGA in (no MIC) to Mono HP
11 Phone Monitor
MIC (w/bias) in to Mono Out
12 Stereo Record & Playback
PGA in (no MIC) to St. HP Out
13 Stereo Rec. & Full Playback
PGA (no MIC) to St. HP & SPK
1.8 2.5 1.8 2.5 1.8 2.5 1.8 2.5 1.8 2.5 1.8 2.5 1.8 2.5 1.8 2.5 1.8 2.5 1.8 2.5 1.8 2.5 1.8 2.5 1.8 2.5 1.8 2.5 1.8 2.5 1.8 2.5 1.8 2.5 1.8 2.5
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.59 2.07 0.00 0.00 2.77 3.27 0.00 0.00 2.79 3.18 1.77 2.13 1.76 2.15 2.76 3.21 3.49 3.95
0.00 0.00 0.00 0.00 1.67 1.87 2.1 2.3 3.48 3.71 3.15 3.37 2.31 2.53 3.18 3.42 5.32 5.57 1.99 2.62 0.20 0.22 2.00 2.63 0.20 0.22 1.91 2.14 3.95 4.77 5.33 6.19 5.05 5.90 5.24 6.10
0.00 0.00 0.01 0.02 2.32 3.72 2.31 3.72 2.32 3.72 2.32 3.73 2.37 3.82 2.37 3.81 2.37 3.81 2.72 4.27 4.42 6.77 2.91 4.28 4.38 6.80 1.06 1.81 4.28 6.63 4.28 6.69 4.64 7.17 7.20 10.46
0.00 0.00 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.01 0.01 0.01 0.01 0.01 0.03 0.03 0.03 0.03
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.30 0.00 3.30 0.00 0.00 0.00 0.00 3.30
0.00 0.00 0.02 0.05 7.24 14.05 7.99 15.13 10.49 18.65 9.90 17.83 8.48 15.95 10.04 18.15 13.90 23.53 11.36 22.43 20.54 29.71 13.84 25.48 20.47 29.79 10.39 17.85 18.05 33.90 20.52 37.65 22.46 40.78 40.94 63.56
20. Unless otherwise noted, test conditions are as follows: All zeros input, slave mode, sample rate = 48 kHz; No load. Digital (VD) and logic (VL) supply current will vary depending on speed mode and master/slave operation. 21. RESET pin 25 held LO, all clocks and data lines are held LO. 22. RESET pin 25 held HI, all clocks and data lines are held HI. 23. VL current will slightly increase in master mode.
24
DS680A1
CS42L52 4. APPLICATIONS
4.1 4.1.1 Overview Basic Architecture
The CS42L52 is a highly integrated, low power, 24-bit audio CODEC comprised of a stereo analog-todigital converter (ADC), a stereo digital-to-analog converter (DAC), a digital PWM modulator and two fullbridge power back-ends. The ADC and DAC are designed using multi-bit delta-sigma techniques - the DAC operates at an oversampling ratio of 128Fs and the ADC operates at 64Fs, where Fs is equal to the system sample rate. The different clock rates maximize power savings while maintaining high performance. The PWM modulator operates at a fixed frequency of 384 kHz. The power FETs are configured for either stereo full-bridge or mono parallel full bridge output. The CODEC operates in one of four sample rate speed modes: Quarter, Half, Single and Double. It accepts and is capable of generating serial port clocks (SCLK, LRCK) derived from an input Master Clock (MCLK).
4.1.2
Line & MIC Inputs
The analog input portion of the CODEC allows selection from and configuration of multiple combinations of stereo and microphone (MIC) sources. Eight line inputs with an option for two balanced MIC inputs, a MIC bias output and a Programmable Gain Amplifier (PGA) comprise the analog front-end.
4.1.3
Line & Headphone Outputs
The analog output portion of the CODEC includes a headphone amplifier capable of driving headphone and line-level loads. An on-chip charge pump creates a negative headphone supply allowing a full-scale output swing centered around ground. This eliminates the need for large DC-Blocking capacitors and allows the amplifier to deliver more power to headphone loads at lower supply voltages.
4.1.4
Speaker Driver Outputs
The Class D power amplifiers drive 8 ohm (stereo) and 4 ohm (mono) speakers directly, without the need for an external filter. The power MOSFETS are powered directly from a battery eliminating the efficiency loss associated with an external regulator. Battery level monitoring and compensation maintains a steady output as battery levels fall. A temperature monitor continually measures the die temperature and registers when predefined thresholds are exceeded. NOTE: The CS42L52 should only be used in captive speaker systems where the outputs are permanently tied to the speaker terminals.
4.1.5
Fixed Function DSP Engine
The fixed-function digital signal processing engine processes both the PCM serial input data and ADC output data, allowing a mix between the two. Independent volume control, left/right channel swaps, mono mixes, tone control and limiting functions also comprise the DSP engine.
4.1.6
Beep Generator
The beep generator delivers tones at select frequencies across approximately two octave major scales. With independent volume control, beeps may be configured to occur continuously, periodically, or at single time intervals.
4.1.7
Power Management
Three control registers provide independent power-down control of the ADC, DAC, PGA, MIC pre-amp, MIC bias, Headphone and Speaker outputs, allowing operation in select applications with minimal power consumption.
DS680A1
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CS42L52
4.2 Analog Inputs
ADCAMUTE DIGSFT DIGZC ADCAVOL[7:0] +24/-96dB 1dB steps HPFRZA HPFA HPFA_CF[1:0] PDN_ADCA INV_ADCA PDN_CHRG = PGAASEL[5:1]
AIN1A AIN2A
Gain Adjust
ADC
ADCASEL[2:0] DIGSUM [1:0] ALCA ALCASRDIS ALCAZCDIS ALCARATE[5:0] ALCRRATE[5:0] MAX[2:0] M IN[2:0] ALCB ALCBSRDIS ALCBZCDIS ADCBSEL[2:0]
Σ
PDN_PGAA PGAAVOL[5:0] ADCB=A ANLGSFTA ANLGZCA PDN_PGAB PGABVOL[5:0] ADCB=A ANLGSFTB ANLGZCB Refer to “M IC Inputs” BIASLVL[2:0] PDN_BIAS Refer to “M IC Inputs”
AIN3A/MIC1-/ MIC1A AIN4A/ MIC1+/ MIC2A
PCM Serial Interface
Swap/ Mix
D IGM IX
ALC
Noise Gate
`
NGALL NG THRESH[3:0] NGDELAY[1:0]
MICBIAS
AIN4B/ MIC2+/ MIC2B
Gain Adjust
ADCBM UTE DIGSFT DIGZC ADCBVOL[7:0] +24/-96dB 1dB steps
ADC
Σ
AIN3B/MIC2-/ MIC1B AIN2B
HPFRZB HPB HPFB_CF[1:0]
PDN_ADCB INV_ADCB PDN_CHRG = PGABSEL[5:1]
AIN1B
TO DSP Engine
ANALOG PASS THRU TO HEADPHONE AM PLIFIER M UX
FROM DSP ENGINE
Figure 5. Analog Input Signal Flow
Referenced Control
Analog Front End PDN_PGAx ......................... PGAxVOL[5:0]..................... ADCB=A .............................. ANLGSFTx .......................... ANLGZCx ............................ ADCxSEL[2:0] ..................... PGAxSEL5,4,3,2,1 .............. BIASLVL[2:0] ....................... PDN_BIAS........................... PDN_ADCx ......................... PDN_CHRG ........................ INV_ADCx ........................... HPFRZx............................... HPFx ................................... HPFx_CF[1:0]...................... ADCxOVFL.......................... Digital Volume ADCxMUTE......................... ADCxVOL............................ ALCx.................................... ALCxSRDIS......................... ALCxZCDIS......................... ALCARATE[5:0]................... ALCRRATE[5:0] .................. MAX[2:0].............................. MIN[2:0]............................... NGALL................................. NG ....................................... THRESH[3:0]....................... NGDELAY[1:0] .................... Miscellaneous DIGSUM[1:0] ....................... DIGMUX ..............................
Register Location
“Power Down PGAx” on page 42 “PGAx Volume” on page 56 “ADC Channel B=A” on page 50 “Ch. x Analog Soft Ramp” on page 49 “Ch. x Analog Zero Cross” on page 49 “ADC Input Select” on page 48 “PGA Input Mapping” on page 49 “MIC Bias Level” on page 48 “Power Down MIC Bias” on page 43 “Power Down ADCx” on page 43 “Power Down ADC Charge Pump” on page 42 “Invert ADC Signal Polarity” on page 50 “ADCx High-Pass Filter Freeze” on page 49 “ADCx High-Pass Filter” on page 49 “HPF x Corner Frequency” on page 50 “ADCx Overflow (Read Only)” on page 71 “ADC Mute” on page 51 “ADCx Volume” on page 57 “ALCx Enable” on page 67 “ALCx Soft Ramp Disable” on page 55 “ALCx Zero Cross Disable” on page 55 “ALC Attack Rate” on page 67 “ALC Release Rate” on page 68 “ALC Maximum Threshold” on page 68 “ALC Minimum Threshold” on page 69 “Noise Gate All Channels” on page 69 “Noise Gate Enable” on page 69 “Noise Gate Threshold and Boost” on page 70 “Noise Gate Delay Timing” on page 70 “Digital Sum” on page 50 “Digital MUX” on page 50
26
DS680A1
CS42L52
4.2.1 MIC Inputs
The input pins 21, 22, 23 and 24 accept stereo line-level or microphone signals. For microphone inputs, either single-ended or differential configuration is allowed, providing programmable pre-amplification of low-level signals. In the single-ended configuration, an internal MUX chooses one of two stereo sets (selection is made independently on channels A and B). In the differential configuration, an internal voltage follower cascaded with the pre-amplifier maintains high input impedance and provides noise rejection above the MICxGAIN setting. The pre-amps are biased to VQ in both configurations.
MICAGAIN[4:0]
23 21
MICAGAIN[4:0]
MIC1A MIC2A
VQ
+
MIC116..32 dB/ 1 dB steps
23 21
to summing PGA A
+
MIC1+
+
16..32 dB/ 1 dB steps
to summing PGA A
MICASEL MICBGAIN[4:0] VQ
MICBGAIN[4:0]
MIC1B MIC2B
24 22
+
MIC216..32 dB/ 1 dB steps
24 22
+
to summing PGA B
MIC2+
+
16..32 dB/ 1 dB steps
to summing PGA B
MICBSEL MICACFG=’0'b MICBCFG=’0'b PDN_MICA=’0'b PDN_MICB=’0'b
MICACFG=’1'b MICBCFG=’1'b PDN_MICA=’0'b PDN_MICB=’0'b
Note : Output to PGA = (MIC + - M IC -)*gain + MIC -
Figure 6. Single-Ended MIC Configuration
Referenced Control
MICxCFG ............................ PDN_MICx .......................... MICxGAIN ...........................
Figure 7. Differential MIC Configuration
Register Location
“MICx Configuration” on page 55 “Power Down MICx” on page 43 “MICx Gain” on page 55
4.2.2
Automatic Level Control (ALC)
When enabled, the ALC monitors the analog input signal after the digital attenuator, detects when peak levels exceed the maximum threshold settings and lowers, first, the PGA gain settings and then increases the digital attenuation levels at a programmable attack rate and maintains the resulting level below the maximum threshold. When input signal levels fall below the minimum threshold, digital attenuation levels are decreased first and the PGA gain is then increased at a programmable release rate and maintains the resulting level above the minimum threshold. Attack and release rates are affected by the ADC soft ramp/zero cross settings and sample rate, Fs. ALC soft ramp and zero cross dependency may be independently enabled/disabled. Recommended settings: Best level control may be realized with the fastest attack and slowest release setting with soft ramp enabled in the control registers. Notes: 1. When ALC x is enabled and the PGAxVOL[5:0] is set above 12 dB, the ADCxVOL[7:0] should not be set below 0 dB. 2. The maximum realized gain must be set in the PGAxVOL register. The ALC will only apply the gain set in the PGAxVOL. 3. The ALC maintains the output signal between the MIN and MAX thresholds. As the input signal level changes, the level-controlled output may not always be the same but will always fall within the thresholds.
Referenced Control Register Location
PGAxVOL[5:0 MAX[2:0], MIN[2:0] “PGAx Vol. & ALCx Transition Ctl.: ALC, PGA A (Address 12h) & ALC, PGA B (Address 13h)” on page 55 “ALC Threshold (Address 2Ch)” on page 68
DS680A1
27
CS42L52
In p u t M IN [2 :0 ]
b e lo w fu ll s ca le
M A X [2 :0 ]
b e lo w fu ll sc a le
ALC
P G A G a in a n d /o r A tte n u a to r
O u tp u t (a fte r A L C ) M IN [2 :0 ]
b e lo w fu ll s c a le
M A X [2 :0 ]
b e lo w fu ll s c a le
R R A T E [5 :0 ]
A R A T E [5 :0 ]
Figure 8. ALC
4.2.3
Noise Gate
The noise gate may be used to mute signal levels that fall below a programmable threshold. This prevents the ALC from applying gain to noise. A programmable delay may be used to set the minimum time before the noise gate attacks the signal. Note: Maximum noise gate attenuation levels will depend on the gain applied in either the PGA or MIC pre-amplifier. For example: If both +32 dB pre-amplification and +12 dB programmable gain is applied, the maximum attenuation that the noise gate achieves will be 52 dB (-96 + 32 + 12) below full-scale.
Referenced Control Register Location
Noise Gate Controls............ “Noise Gate Control (Address 2Dh)” on page 69
Output (dB)
=1
N
G
EN
-52 dB
N
G
=0 EN
Maximum Attenuation*
-64 dB
-80 dB
-96 THRESH[2:0]
-40
Input (dB)
Figure 9. Noise Gate Attenuation
28
DS680A1
CS42L52
4.3 Analog Outputs
INPUTS FROM ADCA and ADCB
Fixed Function DSP
AMIXAMUTE AMIXBMUTE AMIXAVOL[6:0] AMIXBVOL[6:0] +12dB/-51.5dB 0.5dB steps MSTAVOL[7:0] MSTBVOL[7:0] +12dB/-102dB 0.5dB steps
LIMARATE[7:0] LIMRRATE[7:0] LMAX[2:0] CUSH[2:0] LIMSRDIS LIMZCDIS LIMIT
VOL
PMIXAMUTE PMIXBMUTE PMIXAVOL[6:0] PMIXBVOL[6:0] +12dB/-51.5dB 0.5dB steps
Chnl Vol. Settings
Channel Swap
Limiter
PWM Modulator
PCM Serial Interface
ADCASWAP[1:0] ADCBSWAP[1:0]
PCMASWAP[1:0] PCMBSWAP[1:0]
Peak Detect
Bass/ Treble/ Control
TC_EN BASS_CF[1:0] TREB_CF[1:0] BASS[3:0] TREB[3:0] +12.0dB/-10.5dB 1.5dB steps
Demph
DEEMPH
VOL
Channel Swap
Σ
VOL
Σ
VOL
INV_PCMA INV_PCMB BPVOL[4:0] 0dB/-50dB 2.0dB steps
OFFTIME[2:0] ONTIME[3:0] FREQ[3:0] BEEP[1:0] BEEPMIXDIS
MSTAMUTE MSTBMUTE DIGSFT DIGZC PLYBCKB=A
DAC
Beep Generator
Digital Mix to ADC Serial Interface
Figure 10. DSP Engine Signal Flow
Referenced Control
DSP DEEMPH ............................. PMIXxMUTE........................ PMIXxVOL[6:0].................... INV_PCMx........................... PCMxSWAP[1:0] ................. AMIXxMUTE........................ AMIXxVOL[6:0].................... ADCxSWAP[1:0].................. MSTxVOL[7:0]..................... MSTxMUTE......................... DIGSFT ............................... DIGZC ................................. PLYBCKB=A........................ TC_EN................................. BASS_CF[1:0] ..................... TREB_CF[1:0] ..................... BASS[3:0]............................ TREB[3:0]............................ LIMIT ................................... LIMSRDIS ........................... LIMZCDIS............................ LMAX[2:0]............................ CUSH[2:0] ........................... LIMARATE[7:0].................... LIMRRATE[7:0] ...................
Register Location
“HP/Speaker De-Emphasis” on page 52 “PCM Mixer Channel x Mute” on page 58 “PCM Mixer Channel x Volume” on page 58 “Invert PCM Signal Polarity” on page 51 “PCM Mix Channel Swap” on page 64 “ADC Mixer Channel x Mute” on page 58 “ADC Mixer Channel x Volume” on page 58 “ADC Mix Channel Swap” on page 64 “Master Volume Control” on page 63 “Master Playback Mute” on page 51 “Digital Soft Ramp” on page 53 “Digital Zero Cross” on page 53 “Playback Volume Setting B=A” on page 51 “Tone Control Enable” on page 62 “Bass Corner Frequency” on page 62 “Treble Corner Frequency” on page 62 “Bass Gain” on page 63 “Treble Gain” on page 62 “Peak Detect and Limiter” on page 66 “Limiter Soft Ramp Disable” on page 65 “Limiter Zero Cross Disable” on page 66 “Limiter Maximum Threshold” on page 65 “Limiter Cushion Threshold” on page 65 “Limiter Attack Rate” on page 67 “Limiter Release Rate” on page 66
DS680A1
29
CS42L52
BATTCMP VPREF[3:0] VPLVL[7:0] SPKAMUTE SPKBMUTE MUTE50/50 SPKMONO SPKSWAP SPKB=A SPKAVOL[7:0] SPKBVOL[7:0] +0dB/-102dB 0.5dB steps
Battery Compensation
THRFLD SPKATTN[2:0]
TWRN TERR
Thermal Monitor
HPAMUTE HPBMUTE HPA_VOL[7:0] HPB_VOL[7:0] +0dB/-102dB 0.5dB steps
PDN_HPA[1:0] PDN_HPB[1:0] HPGAIN[2:0]
Thermal Foldback VOL PWM Modulator
PDN_SPKA[1:0] PDN_SPKB[1:0] RELEASE
from DSP Engine
Gate Drive
+A +B Speaker Outputs Short Circuit
from DSP Engine
A VOL
DAC
HP/Line Outputs B
Charge Pump
Analog Passthru from PGA
VOL
PASSTHRUA PASSTHRUB PASSAMUTE PASSBMUTE PASSAVOL[7:0] PASSBVOL[70] +12dB/-60dB 0.5dB steps (uses PGA) CHGFREQ[3:0]
SPKASHRT SPKBSHRT
Figure 11. PWM Output Stage
Referenced Control
PWM Control SPKxMUTE ......................... MUTE50/50 ......................... SPKMONO .......................... SPKxVOL[7:0] ..................... SPKSWAP........................... SPKB=A .............................. BATTCMP ........................... VPREF[3:0] ......................... VPLVL[7:0] .......................... THRFLD .............................. SPKATTN[2:0] ..................... PDN_SPKx[1:0]................... RELEASE............................ TWRN.................................. TERR................................... SPKxSHRT..........................
Figure 12. Analog Output Stage
Register Location
“Speaker Mute” on page 53 “Speaker Mute 50/50 Control” on page 54 “Speaker MONO Control” on page 54 “Speaker Volume Control” on page 64 “Speaker Channel Swap” on page 54 “Speaker Volume Setting B=A” on page 54 “Battery Compensation” on page 71 “VP Reference” on page 72 “VP Voltage Level (Read Only)” on page 72 “Thermal Foldback” on page 73 “Speaker Attenuation” on page 74 “Speaker Power Control” on page 44 “Temperature Acknowledge & Release” on page 73 “Thermal Warning Status (Read Only)” on page 73 “Thermal Error Status (Read Only)” on page 73 “Speaker Current Load Status (Read Only)” on page 72
Referenced Control
Analog Output HPxMUTE ........................... HPxVOL[7:0] ....................... PDN_HPx[1:0] ..................... HPGAIN[2:0]........................ PASSTHRUx ....................... PASSxMUTE ....................... PASSxVOL[7:0] ................... CHGFREQ ..........................
Register Location
“Headphone Mute” on page 53 “Headphone Volume Control” on page 63 “Headphone Power Control” on page 44 “Headphone Analog Gain” on page 51 “Passthru Analog” on page 52 “Passthru Mute” on page 52 “Passthru x Volume” on page 56 “Charge Pump Frequency” on page 74
4.3.1
Beep Generator
The Beep Generator generates audio frequencies across approximately two octave major scales. It offers three modes of operation: Continuous, multiple and single (one-shot) beeps. Sixteen on and eight off times are available. Note: The Beep is generated before the limiter and may affect desired limiting performance. If the limiter function is used, it may be required to set the beep volume sufficiently below the threshold to prevent the peak detect from triggering. Since the master volume control, MSTxVOL[7:0], will affect the beep volume, DAC volume may alternatively be controlled using the PMIXxVOL[6:0] bits.
30
DS680A1
CS42L52
BEEP[1:0] = '11' CONTINUOUS BEEP: Beep turns on at a configurable frequency (FREQ) and volume (BPVOL) and remains on until BEEP is cleared.
BEEP[1:0] = '10'
MULTI-BEEP: Beep turns on at a configurable frequency (FREQ) and volume (BPVOL) for the duration of ONTIME and turns off for the duration of OFFTIME. On and off cycles are repeated until BEEP is cleared. SINGLE-BEEP: Beep turns on at a configurable frequency (FREQ) and volume (BPVOL) for the duration of ONTIME. BEEP must be cleared and set for additional beeps.
BEEP[1:0] = '01'
BPVOL[4:0]
...
FREQ[3:0] ONTIME[3:0] OFFTIME[2:0]
Figure 13. Beep Configuration Options
Referenced Control
MSTxVOL[7:0]..................... PMIXxVOL[6:0] ................... OFFTIME[2:0] ..................... ONTIME[3:0] ....................... FREQ[3:0] ........................... BEEP[1:0]............................ BEEPMIXDIS ...................... BPVOL[4:0] .........................
Register Location
“Master Volume Control: MSTA (Address 20h) & MSTB (Address 21h)” on page 63 “PCMx Mixer Volume: PCMA (Address 1Ah) & PCMB (Address 1Bh)” on page 58 “Beep Off Time” on page 60 “Beep On Time” on page 60 “Beep Frequency” on page 59 “Beep Configuration” on page 61 “Beep Mix Disable” on page 61 “Beep Volume” on page 61
4.3.2
Limiter
When enabled, the limiter monitors the digital input signal before the DAC and PWM modulators, detects when levels exceed the maximum threshold settings and lowers the master volume at a programmable attack rate below the maximum threshold. When the input signal level falls below the maximum threshold, the AOUT volume returns to its original level set in the Master Volume Control register at a programmable release rate. Attack and release rates are affected by the DAC soft ramp/zero cross settings and sample rate, Fs. Limiter soft ramp and zero cross dependency may be independently enabled/disabled. Notes: 1. Recommended settings: Best limiting performance may be realized with the fastest attack and slowest release setting with soft ramp enabled in the control registers. The MIN bits allow the user to set a threshold slightly below the maximum threshold for hysteresis control - this cushions the sound as the limiter attacks and releases. 2. The Limiter maintains the output signal between the MIN and MAX thresholds. As the digital input signal level changes, the level-controlled output may not always be the same but will always fall within the thresholds.
Referenced Control Register Location
Limiter Controls ................... “Limiter Control 2, Release Rate (Address 28h)” on page 66, “Limiter Attack Rate (Address 29h)” on page 67 Master Volume Control........ “Master Volume Control: MSTA (Address 20h) & MSTB (Address 21h)” on page 63
DS680A1
31
CS42L52
In p u t
M A X [2 :0 ]
L im ite r
V o lu m e
A T T A C K /R E L E A S E S O U N D C U S H IO N
O u tp u t (a fte r L im ite r)
C U S H [2 :0 ]
M A X [2 :0 ]
A R A T E [5 :0 ]
R R A T E [5 :0 ]
Figure 14. Peak Detect & Limiter
4.4
Analog In to Analog Out Passthru
The CS42L52 accommodates analog routing of the analog input signal directly to the headphone amplifiers. This feature is useful in applications that utilize an FM tuner where audio recovered over-the-air must be transmitted to the headphone amplifier without digital conversion in the ADC and DAC. This analog passthru path reduces power consumption and is immune to modulator switching noise that could interfere with some tuners.
4.4.1
Overriding the ADC Power Down
To accommodate automatic activation of the speaker amplifier when the SPK/HP_SW switch pin changes, the CS42L52 provides the option to automatically power up the ADC whenever the analog signal must route to the digital PWM modulator, regardless of the PDN_ADC bit. Refer to the table below for how this ADC power-down override functions in accord with the state of the speaker channels. The shaded cells represent normal ADC operation when passthru is disabled.
PDN_ADC 0 1 PASSTHRU x 0 1 PDN_OVRD x x 0 1 Speaker Channel x x x OFF ON ADC Status Powered UP Powered DOWN Powered DOWN Powered DOWN Powered UP
When PASSTHRU and PDN_OVRD are enabled, turning the speaker channel ON (by writing ‘11’b to SPKx_PDN[1:0] or by automatic activation of the headphone detect switch, SPK/HP_SW) will automatically disable the ADCx_PDN in order to convert the analog input to a digital signal for the PWM modulator. This allows automatic analog input routing to the speaker amplifiers. 32 DS680A1
CS42L52
Referenced Control
PDN_ADCx ......................... PASSTHRU ......................... PDN_OVRD ........................ SPKx_PDN[1:0]...................
Register Location
“Power Down ADCx” on page 43 “Passthru Analog” on page 52 “Power Down ADC Override” on page 43 “Speaker Power Control” on page 44
4.4.2
Overriding the PGA Power Down
To accommodate automatic activation of the headphone amplifier when the SPK/HP_SW switch pin changes, the CS42L52 will automatically power up the PGA whenever passthru is enabled, regardless of the PDN_PGA setting. Refer to the table below for how this PGA power-down override functions in accord with the state of the headphone channels. The shaded cells represent normal PGA operation when Passthru is disabled.
PDN_PGA 0 1 PASSTHRU x 0 1 HP Channel x x OFF ON PGA Status Powered UP Powered DOWN Powered DOWN Powered UP
When Passthru is enabled, turning the headphone channel ON (by writing ‘11’b to HPx_PDN[1:0] or by automatic activation of the headphone detect switch, SPK/HP_SW) will automatically disable the PGAx_PDN in order to transmit the analog signal to the headphone.
Referenced Control Register Location
PDN_PGAx ......................... “Power Down PGAx” on page 42 PASSTHRU ......................... “Passthru Analog” on page 52 HPx_PDN[1:0]..................... “Headphone Power Control” on page 44
4.5 4.5.1
PWM Outputs Mono Speaker Output Configuration
The CS42L52 accommodates a stereo as well as a mono speaker output configuration. In mono mode the output drivers of each channel are connected in parallel to deliver maximum power to a 4 ohm speaker. Refer to the table below for pin mapping in mono configuration.
Speaker Output SPKMONO=0 SPKMONO=1 SPKSWAP=0 SPKSWAP=1 SPKSWAP=0 SPKSWAP=1 SPKOUTA+ SPKOUTB+ SPKOUTA+ SPKOUTB+ SPKOUTASPKOUTBSPKOUTA+ SPKOUTB+ SPKOUTB+ SPKOUTA+ SPKOUTASPKOUTBSPKOUTBSPKOUTASPKOUTASPKOUTBRegister Location
Pin 4 6 7 9 Referenced Control
SPKMONO.......................... “Speaker MONO Control” on page 54 SPKSWAP........................... “Speaker Channel Swap” on page 54
4.5.2
VP Battery Compensation
The CS42L52 provides the option to maintain a desired power output level, independent of the VP supply. When enabled, this feature works by monitoring the voltage on the VP supply and reducing the attenuation on the speaker outputs when VP voltage levels fall.
Note:
The internal ADC that monitors the VP supply operates from the VA supply. Calculations are based on typical VA levels of 1.8 V and 2.5 V using the VPREF bits. 33
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CS42L52
4.5.2.1 Maintaining a Desired Output Level
Using SPKxVOL, the speaker output level must first be attenuated by the decibel equivalent of the expected VP supply range (MAX relative to MIN). The CS42L52 then gradually reduces the attenuation as the VP supply drops from it’s maximum level, maintaining a nearly constant power output. Compensation Example 1 (VP Battery supply ranges from 4.5 V to 3.0 V) 1. Set speaker attenuation (SPKxVOL) to -3.5 dB. The VP supply changes ~3.5 dB. 2. Set the reference VP supply (VPREF) to 4.5 V. 3. Enable battery compensation (BATTCMP). The CS42L52 automatically adjusts the output level as the battery discharges. Compensation Example 2 (VP Battery supply ranges from 5.0 V to 1.6 V) 1. Set speaker attenuation (SPKxVOL) to -10 dB. The VP supply changes ~9.9 dB. 2. Set the reference VP supply (VPREF) to 5.0 V. 3. Enable battery compensation (BATTCMP). The CS42L52 automatically adjusts the output level as the battery discharges. Refer to Figure 15 on page 34. In this example, the VP supply changes over a wide range, illustrating the accuracy of the CS42L52’s battery compensation.
-6 -8
PWM Output Level (dB)
Battery Compensated PWM Output Level Uncompensated PWM Output Level
-10 -12 -14 -16 -18 -20 -22 -24 4.9 4.6 4.3 4 3.7 3.4 3.1 2.8 2.5 2.2 1.9 1.6
VP Supply (V)
Figure 15. Battery Compensation
Referenced Control
VPREF ................................ SPKxVOL ............................
Register Location
“VP Reference” on page 72 “Speaker Volume Control” on page 64
4.6
Serial Port Clocking
The CODEC serial audio interface port operates either as a slave or master, determined by the M/S bit. It accepts externally generated clocks in Slave Mode and will generate synchronous clocks derived from an input master clock (MCLK) in Master Mode. Refer to the tables below for the required setting in register 05h and 06h associated with a given MCLK and sample rate.
Referenced Control
M/S Register 05h Register 06h
Register Location
“Master/Slave Mode” on page 46 “Clocking Control (Address 05h)” on page 44 “Interface Control 1 (Address 06h)” on page 46
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MCLK (MHz) Sample Rate, Fs (kHz) 8.0000 12.0000 16.0000 24.0000 32.0000 48.0000 96.0000 11.0250 22.0500 44.1000 88.2000 8.0000 12.0000 16.0000 24.0000 32.0000 48.0000 96.0000 8.0182 11.0250 22.0500 44.1000 88.2000 8.0000 11.0294 12.0000 16.0000 22.0588 24.0000 32.0000 44.1176 48.0000 88.2353 96.0000 8.0000 11.0294 12.0000 16.0000 22.0588 24.0000 32.0000 44.1176 48.0000 88.2353 96.0000 8.0000 12.0000 24.0000 32.0000 44.1176 48.0000 11.0294 22.0588 16.0000 SPEED[1:0] (AUTO=’0’b) 11 11 10 10 01 01 00 11 10 01 00 11 11 10 10 01 01 00 11 11 10 01 00 11 11 11 10 10 10 01 01 01 00 00 11 11 11 10 10 10 01 01 01 00 00 11 11 10 01 01 01 11 10 10 32kGROUP 1 0 1 0 1 0 0 0 0 0 0 1 0 1 0 1 0 0 0 0 0 0 0 1 0 0 1 0 0 1 0 0 0 0 1 0 0 1 0 0 1 0 0 0 0 1 0 0 1 0 0 0 0 1 VIDEOCLK 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 RATIO[1:0] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 10 00 00 00 00 01 11 01 01 11 01 01 11 01 11 01 01 11 01 01 11 01 01 11 01 11 01 01 01 01 01 11 01 11 11 01 MCLKDIV2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0
12.2880
11.2896
18.4320
16.9344
12.0000
24.0000
27.0000
Table 1. MCLK, LRCK Quick Decode
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CS42L52
4.7 Digital Interface Formats
The serial port operates in standard I²S, Left-Justified, Right-Justified (DAC only), or DSP Mode digital interface formats with varying bit depths from 16 to 24. Data is clocked out of the ADC or into the DAC on the rising edge of SCLK.
LRCK SCLK SDIN SDOUT
MSB AOUTA / AINxA LS B M SB AOUTB / AINxB LS B
L eft C h a n n el
R ig ht C h a n n el
MSB
Figure 16. I²S Format
LRCK SCLK SDIN SDOUT
MSB AOUTA / AINxA LS B M SB AOUTB / AINxB LS B
L eft C h a n n el
R ig ht C h a n n el
MSB
Figure 17. Left-Justified Format
LRCK SCLK SDIN
MSB AO UTL
Audio W ord Length (AW L)
L e ft C h a n n e l
R ig h t C h a n n e l
LSB
MSB AO UTR
LS B
Figure 18. Right-Justified Format (DAC only)
4.7.1
DSP Mode
In DSP Mode, the LRCK acts as a frame sync for 2 data-packed words (left and right channel) input on SDIN and output on SDOUT. The MSB is input/output on the first SCLK rising edge after the frame sync rising edge. The right channel immediately follows the left channel.
1/fs
LRCK SCLK SDIN
L SB MSB L eft C h a n n el HP/LINE OUTA Audio Word Length (AWL) LS B M SB R ig ht C h a n n el HP/LINE OUTB LSB M SB
Figure 19. DSP Mode Format)
4.8
Initialization
The CODEC enters a Power-Down state upon initial power-up. The interpolation and decimation filters, delta-sigma and PWM modulators and control port registers are reset. The internal voltage reference, and switched-capacitor low-pass filters are powered down.
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The device will remain in the Power-Down state until the RESET pin is brought high. The control port is accessible once RESET is high and the desired register settings can be loaded per the interface descriptions in the “Register Description” on page 42. Once MCLK is valid, the quiescent voltage, VQ, and the internal voltage reference, FILT+, will begin powering up to normal operation. The charge pump slowly powers up and charges the capacitors. Power is then applied to the headphone amplifiers and switched-capacitor filters, and the analog/digital outputs enter a muted state. Once LRCK is valid, MCLK occurrences are counted over one LRCK period to determine the MCLK/LRCK frequency ratio and normal operation begins.
4.9
Recommended Power-Up Sequence
1. Hold RESET low until the power supplies are stable. 2. Bring RESET high. 3. The default state of the PDN bit is ‘1’b. Load the desired register settings while keeping the PDN bit set to ‘1’b. 4. Start MCLK to the appropriate frequency, as discussed in Section 4.6. 5. Set the PDN bit to ‘0’b. 6. Apply LRCK, SCLK and SDIN for normal operation to begin. 7. Bring RESET low if the analog or digital supplies drop below the recommended operating condition to prevent power glitch related issues.
4.10
Recommended Power-Down Sequence
To minimize audible pops when turning off or placing the CODEC in standby, 1. Mute the DAC’s and ADC’s. 2. Set the PDN bit in the power control register to ‘1’b. The CODEC will not power down until it reaches a fully muted sate. Do not remove MCLK until after the part has fully muted. Note that it may be necessary to disable the soft ramp and/or zero cross volume transitions to achieve faster muting/power down. 3. Bring RESET low.
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CS42L52
4.11 Control Port Operation
The control port is used to access the registers allowing the CODEC to be configured for the desired operational modes and formats. The operation of the control port may be completely asynchronous with respect to the audio sample rates. However, to avoid potential interference problems, the control port pins should remain static if no operation is required. The control port operates using an I²C interface with the CODEC acting as a slave device.
4.11.1
I²C Control
SDA is a bidirectional data line. Data is clocked into and out of the part by the clock, SCL. The signal timings for a read and write cycle are shown in Figure 20 and Figure 21. A Start condition is defined as a falling transition of SDA while the clock is high. A Stop condition is defined as a rising transition of SDA while the clock is high. All other transitions of SDA occur while the clock is low. The first byte sent to the CS42L52 after a Start condition consists of a 7-bit chip address field and a R/W bit (high for a read, low for a write). The upper 7 bits of the address field are fixed at 1001010. To communicate with the CS42L52, the chip address field, which is the first byte sent to the CS42L52, should match 1001010. The eighth bit of the address is the R/W bit. If the operation is a write, the next byte is the Memory Address Pointer (MAP), which selects the register to be read or written. If the operation is a read, the contents of the register pointed to by the MAP will be output. Setting the auto-increment bit in MAP allows successive reads or writes of consecutive registers. Each byte is separated by an acknowledge bit. The ACK bit is output from the CS42L52 after each input byte is read and is input to the CS42L52 from the microcontroller after each transmitted byte.
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 24 25 26 27 28
SCL
CHIP ADDRESS (WRITE) MAP BYTE
INCR
DATA
1 0 7 6 1 0 7
DATA +1
6 1 0 7
DATA +n
6 1 0
SDA
1
0
0
1
0
1
0
0
6
5
4
3
2
ACK START
ACK
ACK
ACK STOP
Figure 20. Control Port Timing, I²C Write
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
SCL
CHIP ADDRESS (WRITE) MAP BYTE
INCR
STOP
1 0 1
CHIP ADDRESS (READ)
0 0 1 0 101
DATA
7 0
DATA +1
7 0
DATA + n
7 0
SDA
START
1
0
0
1
0100
6
5
4
3
2
ACK
ACK START
ACK
ACK
NO ACK
STOP
Figure 21. Control Port Timing, I²C Read Since the read operation cannot set the MAP, an aborted write operation is used as a preamble. As shown in Figure 21, the write operation is aborted after the acknowledge for the MAP byte by sending a stop condition. The following pseudocode illustrates an aborted write operation followed by a read operation. Send start condition. Send 10010100 (chip address & write operation). Receive acknowledge bit. 38 DS680A1
CS42L52
Send MAP byte, auto-increment off. Receive acknowledge bit. Send stop condition, aborting write. Send start condition. Send 10010101 (chip address & read operation). Receive acknowledge bit. Receive byte, contents of selected register. Send acknowledge bit. Send stop condition. Setting the auto-increment bit in the MAP allows successive reads or writes of consecutive registers. Each byte is separated by an acknowledge bit.
4.11.2
Memory Address Pointer (MAP)
The MAP byte comes after the address byte and selects the register to be read or written. Refer to the pseudo code above for implementation details.
4.11.2.1 Map Increment (INCR)
The device has MAP auto-increment capability enabled by the INCR bit (the MSB) of the MAP. If INCR is set to 0, MAP will stay constant for successive I²C writes or reads. If INCR is set to 1, MAP will auto-increment after each byte is read or written, allowing block reads or writes of successive registers.
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CS42L52 5. REGISTER QUICK REFERENCE
(Default values are shown below the bit names)
I²C Address: 1001010[R/W] - 10010100 = 0x94(Write); 10010101 = 0x95(Read) Adr. Function 7 6 5 4 01h ID CHIPID4 CHIPID3 CHIPID2 CHIPID1 p 42 1 1 1 0 02h Power Ctl 1 PDN_CHRG Reserved Reserved PDN_PGAB p 42 0 0 0 0 03h Power Ctl 2 Reserved Reserved Reserved OVRDB p 43 0 0 0 0 04h Power Ctl 3 PDN_HPB1 PDN_HPB0 PDN_HPA1 PDN_HPA0 p 44 0 0 0 0 05h Clocking Ctl AUTO SPEED1 SPEED0 32kGROUP p 44 1 0 1 0 06h Interface Ctl 1 M/S INV_SCLK ADCDIF DSP p 46 0 0 0 0 07h Interface Ctl 2 Reserved SCLK=MCLK DIGLOOP 3ST_SP p 47 0 0 0 0 08h Input A Select ADCASEL2 ADCASEL1 ADCASEL0 PGAASEL5 p 48 1 0 0 0 09h Input B Select ADCBSEL2 ADCBSEL1 ADCBSEL0 PGABSEL5 p 48 1 0 0 0 0Ah Analog, HPFB HPFRZB HPFA HPFRZA p 49 HPF Ctl 1 0 1 0 0Bh ADC HPF CorReserved Reserved Reserved Reserved p 50 ner Freq. 0 0 0 0 0Ch Misc. ADC Ctl ADCB=A DIGMIX DIGSUM1 DIGSUM0 p 50 0 0 0 0 0Dh Playback Ctl 1 HPGAIN2 HPGAIN1 HPGAIN0 PLYBCKB=A p 51 0 1 1 0 0Eh Misc. Ctl PASSTHRUB PASSTHRUA PASSBMUTE PASSAMUTE p 52 0 0 0 0 0Fh Playback Ctl 2 HPBMUTE HPAMUTE SPKBMUTE SPKAMUTE p 53 0 0 0 0 10h MICA Amp Ctl Reserved MICASEL MICACFG MICAGAIN4 p 54 0 0 0 0 11h MICB Amp Ctl Reserved MICBSEL MICBCFG MICBGAIN4 p 54 0 0 0 0 12h PGAA Vol, Misc ALCASRDIS ALCAZCDIS PGAAVOL5 PGAAVOL4 p 55 0 0 0 0 13h PGAB Vol, Misc ALCBSRDIS ALCBZCDIS PGABVOL5 PGABVOL4 p 55 0 0 0 0 14h Passthru A Vol PASSAVOL7 PASSAVOL6 PASSAVOL5 PASSAVOL4 p 56 0 0 0 0 15h Passthru B Vol PASSBVOL7 PASSBVOL6 PASSBVOL5 PASSBVOL4 p 56 0 0 0 0 16h ADCA Vol ADCAVOL7 ADCAVOL6 ADCAVOL5 ADCAVOL4 p 57 0 0 0 0 17h ADCB Vol ADCBVOL7 ADCBVOL6 ADCBVOL5 ADCBVOL4 p 57 0 0 0 0 18h ADCMIXA Vol AMIXAMUTE AMIXAVOL6 AMIXAVOL5 AMIXAVOL4 p 58 1 0 0 0 19h ADCMIXB Vol AMIXBMUTE AMIXBVOL6 AMIXBVOL5 AMIXBVOL4 p 58 1 0 0 0 1Ah PCMMIXA Vol PMIXAMUTE PMIXAVOL6 PMIXAVOL5 PMIXAVOL4 p 58 0 0 0 0 3 CHIPID0 0 PDN_PGAA 0 OVRDA 0 PDN_SPKB1 0 VIDEOCLK 0 DACDIF1 0 INV_SWCH 0 PGAASEL4 0 PGABSEL4 0 ANLGSFTB 0 HPFB_CF1 0 INV_ADCB 0 INV_PCMB 0 FREEZE 0 SPKB=A 0 MICAGAIN3 0 MICBGAIN3 0 PGAAVOL3 0 PGABVOL3 0 PASSAVOL3 0 PASSBVOL3 0 ADCAVOL3 0 ADCBVOL3 0 AMIXAVOL3 0 AMIXBVOL3 0 PMIXAVOL3 0 2 REVID2 x PDN_ADCB 0 PDN_MICB 1 PDN_SPKB0 1 RATIO1 0 DACDIF0 0 BIASLVL2 0 PGAASEL3 0 PGABSEL3 0 ANLGZCB 1 HPFB_CF0 0 INV_ADCA 0 INV_PCMA 0 DEEMPH 0 SPKSWAP MICAGAIN2 0 MICBGAIN2 0 PGAAVOL2 0 PGABVOL2 0 PASSAVOL2 0 PASSBVOL2 0 ADCAVOL2 0 ADCBVOL2 0 AMIXAVOL2 0 AMIXBVOL2 0 PMIXAVOL2 0 1 REVID1 x PDN_ADCA 0 PDN_MICA 1 PDN_SPKA1 0 RATIO0 0 AWL1 0 BIASLVL1 0 PGAASEL2 0 PGABSEL2 0 ANLGSFTA 0 HPFA_CF1 0 ADCBMUTE 0 MSTBMUTE 0 DIGSFT 1 SPKMONO 0 MICAGAIN1 0 MICBGAIN1 0 PGAAVOL1 0 PGABVOL1 0 PASSAVOL1 0 PASSBVOL1 0 ADCAVOL1 0 ADCBVOL1 0 AMIXAVOL1 0 AMIXBVOL1 0 PMIXAVOL1 0 0 REVID0 x PDN 1 PDN_BIAS 1 PDN_SPKA0 1 MCLKDIV2 0 AWL0 0 BIASLVL0 0 PGAASEL1 1 PGABSEL1 1 ANLGZCA 1 HPFA_CF0 0 ADCAMUTE 0 MSTAMUTE 0 DIGZC 0 MUTE50/50 0 MICAGAIN0 0 MICBGAIN0 0 PGAAVOL0 0 PGABVOL0 0 PASSAVOL0 0 PASSBVOL0 0 ADCAVOL0 0 ADCBVOL0 0 AMIXAVOL0 0 AMIXBVOL0 0 PMIXAVOL0 0
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I²C Address: 1001010[R/W] - 10010100 = 0x94(Write); 10010101 = 0x95(Read) Adr. Function 7 6 5 4 1Bh PCMMIXB Vol PMIXBMUTE PMIXBVOL6 PMIXBVOL5 PMIXBVOL4 p 58 0 0 0 0 1Ch BEEP Freq, FREQ3 FREQ2 FREQ1 FREQ0 p 59 On Time 0 0 0 0 1Dh BEEP Vol, OFFTIME2 OFFTIME1 OFFTIME0 BPVOL4 p 60 Off Time 0 0 0 0 1Eh BEEP, BEEP1 BEEP0 BEEPMIXDIS TREB_CF1 p 61 Tone Cfg. 0 0 0 0 1Fh Tone Ctl TREB3 TREB2 TREB1 TREB0 p 62 1 0 0 0 20h Master A Vol MSTAVOL7 MSTAVOL6 MSTAVOL5 MSTAVOL4 p 63 0 0 0 0 21h Master B Vol MSTBVOL7 MSTBVOL6 MSTBVOL5 MSTBVOL4 p 63 0 0 0 0 22h Headphone A HPAVOL7 HPAVOL6 HPAVOL5 HPAVOL4 p 63 Volume 0 0 0 0 23h Headphone B HPBVOL7 HPBVOL6 HPBVOL5 HPBVOL4 p 63 Volume 0 0 0 0 24h Speaker A SPKAVOL7 SPKAVOL6 SPKAVOL5 SPKAVOL4 p 64 Volume 0 0 0 0 25h Speaker B SPKBVOL7 SPKBVOL6 SPKBVOL5 SPKBVOL4 p 64 Volume 0 0 0 0 26h Channel Mixer PCMASWP1 PCMASWP0 PCMBSWP1 PCMBSWP0 p 64 & Swap 0 0 0 0 27h Limit Ctl 1, LMAX2 LMAX1 LMAX0 CUSH2 p 65 Thresholds 0 0 0 0 28h Limit Ctl 2, LIMIT LIMIT_ALL LIMRRATE5 LIMRRATE4 p 66 Release Rate 0 1 1 1 29h Limiter Attack Reserved Reserved LIMARATE5 LIMARATE4 p 67 Rate 1 1 0 0 2Ah ALC Ctl 1, ALCB ALCA ALCARATE5 AALCRATE4 p 67 Attack Rate 0 0 0 0 2Bh ALC Release Reserved Reserved ALCRRATE5 ALCRRATE4 p 68 Rate 0 0 1 1 2Ch ALC ThreshALCMAX2 ALCMAX1 ALCMAX0 ALCMIN2 p 68 olds 0 0 0 0 2Dh Noise Gate Ctl NGALL NG NGBOOST THRESH2 p 69 0 0 0 0 2Eh Overflow & Reserved SPCLKERR DSPBOVFL DSPAOVFL p 70 Clock Status 0 0 0 0 2Fh Battery ComBATTCMP VPMONITOR Reserved Reserved p 71 pensation 0 0 0 0 30h VP Battery VPLVL7 VPLVL6 VPLVL5 VPLVL4 p 72 Level 0 0 0 0 31h Speaker Status Reserved Reserved SPKASHRT SPKBSHRT p 72 0 0 0 0 32h Temperature RELEASE Reserved Reserved Reserved p 73 Monitor Control 0 0 1 1 33h Thermal FoldReserved Reserved Reserved Reserved p 73 back 0 0 0 0 34h Charge Pump CHGFREQ3 CHGFREQ2 CHGFREQ1 CHGFREQ0 p 74 Frequency 0 1 0 1 3 PMIXBVOL3 0 ONTIME3 0 BPVOL3 0 TREB_CF0 0 BASS3 1 MSTAVOL3 0 MSTBVOL3 0 HPAVOL3 0 HPBVOL3 0 SPKAVOL3 0 SPKBVOL3 0 ADCASWP1 0 CUSH1 0 LIMRRATE3 1 LIMARATE3 0 ALCARATE3 0 ALCRRATE3 1 ALCMIN1 0 THRESH1 0 PCMAOVFL 0 VPREF3 0 VPLVL3 0 SPKR/HP 0 Reserved 1 THRFLD 0 Reserved 1 2 PMIXBVOL2 0 ONTIME2 0 BPVOL2 0 BASS_CF1 0 BASS2 0 MSTAVOL2 0 MSTBVOL2 0 HPAVOL2 0 HPBVOL2 0 SPKAVOL2 0 SPKBVOL2 0 ADCASWP0 0 CUSH0 0 LIMRRATE2 1 LIMARATE2 0 ALCARATE2 0 ALCRRATE2 1 ALCMIN0 0 THRESH0 0 PCMBOVFL 0 VPREF2 0 VPLVL2 0 Reserved 0 Reserved 0 SPKATTN2 0 Reserved 1 1 PMIXBVOL1 0 ONTIME1 0 BPVOL1 0 BASS_CF0 0 BASS1 0 MSTAVOL1 0 MSTBVOL1 0 HPAVOL1 0 HPBVOL1 0 SPKAVOL1 0 SPKBVOL1 0 ADCBSWP1 0 LIMSRDIS 0 LIMRRATE1 1 LIMARATE1 0 ALCARATE1 0 ALCRRATE1 1 Reserved 0 NGDELAY1 0 ADCAOVFL 0 VPREF1 0 VPLVL1 0 TWRN 0 Reserved 1 SPKATTN1 0 Reserved 1 0 PMIXBVOL0 0 ONTIME0 0 BPVOL0 0 TC_EN 0 BASS0 0 MSTAVOL0 0 MSTBVOL0 0 HPAVOL0 0 HPBVOL0 0 SPKAVOL0 0 SPKBVOL0 0 ADCBSWP0 0 LIMZCDIS 0 LIMRRATE0 1 LIMARATE0 0 ALCARATE0 0 ALCRRATE0 1 Reserved 0 NGDELAY0 0 ADCBOVFL 0 VPREF0 0 VPLVL0 0 TERR 0 Reserved 1 SPKATTN0 0 Reserved 1
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CS42L52 6. REGISTER DESCRIPTION
All registers are read/write except for the chip I.D. and Revision Register and Interrupt Status Register which are read only. See the following bit definition tables for bit assignment information. The default state of each bit after a power-up sequence or reset is listed in each bit description. All “Reserved” bits must maintain their default value.
6.1
Chip I.D. and Revision Register (Address 01h) (Read Only)
6 CHIPID3 5 CHIPID2 4 CHIPID1 3 CHIPID0 2 REVID2 1 REVID1 0 REVID0
7 CHIPID4
6.1.1
Chip I.D. (Read Only)
I.D. code for the CS42L52.
CHIPID[4:0] Device
11100
CS42L52
6.1.2
Chip Revision (Read Only)
CS42L52 revision level.
REVID[2:0] Revision Level
000 001 010
A0 A1 B0
6.2
Power Control 1 (Address 02h)
6 Reserved 5 Reserved 4 PDN_PGAB 3 PDN_PGAA 2 PDN_ADCB 1 PDN_ADCA 0 PDN
7 PDN_CHRG
6.2.1
Power Down ADC Charge Pump
Configures the power state of the ADC charge pump.
PDN_CHRG ADC Charge Pump Status
0 1
Powered Up Powered Down
6.2.2
Power Down PGAx
Configures the power state of PGA channel x.
PDN_PGAx PGA Status
0 1
Application
Powered Up (ONLY when the ADC or the analog passthru is used) Powered Down “Analog In to Analog Out Passthru” on page 32
Notes: 1. The CS42L52 employs a clever scheme for controlling the power to the PGA when PASSTHRU (“Passthru Analog” on page 52) is enabled. Refer to the referenced application for more information. 2. This bit is also used in conjunction with AINx_SEL bits to determine the analog input path to the ADC. Refer to “ADC Input Select” on page 48 for the required settings.
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6.2.3 Power Down ADCx
Configures the power state of ADC channel x.
PDN_ADCx ADC Status
0 1
Application
Powered Up Powered Down “Analog In to Analog Out Passthru” on page 32
Notes: 1. The CS42L52 employs a clever scheme for controlling the power to the ADC when PASSTHRU (“Passthru Analog” on page 52) and PDN_OVRD (“Power Down ADC Override” on page 43) are enabled. Refer to the referenced application.
6.2.4
Power Down
Configures the power state of the entire CODEC.
PDN CODEC Status
0 1
Powered Up Powered Down
6.3
Power Control 2 (Address 03h)
6 Reserved 5 Reserved 4 OVRDB 3 OVRDA 2 PDN_MICB 1 PDN_MICA 0 PDN_BIAS
7 Reserved
6.3.1
Power Down ADC Override
Configures an override of the power down control for ADCx.
OVRDx PDN_ADC Override
0 1
Application
Disable Enable “Analog In to Analog Out Passthru” on page 32
6.3.2
Power Down MICx
Configures the power state of the microphone pre-amplifier for channel x.
PDN_MICx MIC Pre-Amp Status
0 1
Application
Powered Up Powered Down “MIC Inputs” on page 27
6.3.3
Power Down MIC Bias
Configures the power state of the microphone bias circuit.
PDN_BIAS MIC Bias Status
0 1
Powered Up Powered Down
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CS42L52
6.4 Power Control 3 (Address 04h)
6 PDN_HPB0 5 PDN_HPA1 4 PDN_HPA0 3 PDN_SPKB1 2 PDN_SPKB0 1 PDN_SPKA1 0 PDN_SPKA0 7 PDN_HPB1
6.4.1
Headphone Power Control
Configures how the SPK/HP_SW pin, 6, controls the power for the headphone amplifier.
PDN_HPx[1:0] Headphone Status
00 01 10 11
Headphone channel is ON when the SPK/HP_SW pin, 6, is LO. Headphone channel is OFF when the SPK/HP_SW pin, 6, is HI. Headphone channel is ON when the SPK/HP_SW pin, 6, is HI. Headphone channel is OFF when the SPK/HP_SW pin, 6, is LO. Headphone channel is always ON. Headphone channel is always OFF.
6.4.2
Speaker Power Control
Configures how the SPK/HP_SW pin, 6, controls the power for the speaker amplifier.
PDN_SPKx[1:0] Speaker Status
00 01 10 11
Speaker channel is ON when the SPK/HP_SW pin, 6, is LO. Speaker channel is OFF when the SPK/HP_SW pin, 6, is HI. Speaker channel is ON when the SPK/HP_SW pin, 6, is HI. Speaker channel is OFF when the SPK/HP_SW pin, 6, is LO. Speaker channel is always ON. Speaker channel is always OFF.
6.5
Clocking Control (Address 05h)
7 AUTO 6 SPEED1 5 SPEED0 4 32k_GROUP 3 VIDEOCLK 2 RATIO1 1 RATIO0 0 MCLKDIV2
6.5.1
Auto-Detect
Configures the auto-detect circuitry for detecting the speed mode of the CODEC when operating as a slave.
AUTO Auto-detection of Speed Mode
0 1
Application:
Disabled Enabled “Serial Port Clocking” on page 34
Notes: 1. The SPEED[1:0] bits are ignored and speed is determined by the MCLK/LRCK ratio. 2. When AUTO is disabled and the CODEC operates in master mode, the MCLKDIV2 bit is ignored. 3. Certain sample and MCLK frequencies require setting the SPEED[1:0] bits, the 32k_GROUP bit (“32kHz Sample Rate Group” on page 45) and/or the VIDEOCLK bit (“27 MHz Video Clock” on page 45) and RATIO[1:0] bits (“Internal MCLK/LRCK Ratio” on page 45). Low sample rates may also affect dynamic range performance in the typical audio band. Refer to the referenced application for more information.
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6.5.2 Speed Mode
Configures the speed mode of the CODEC in slave mode and sets the appropriate MCLK divide ratio for LRCK and SCLK in master mode.
SPEED[1:0] Slave Mode Serial Port Speed Master Mode MCLK/LRCK Ratio SCLK/LRCK Ratio
00 01 10 11
Application:
Double-Speed Mode (DSM - 50 kHz -100 kHz Fs) Single-Speed Mode (SSM - 4 kHz -50 kHz Fs) Half-Speed Mode (HSM - 12.5kHz -25 kHz Fs) Quarter-Speed Mode (QSM - 4 kHz -12.5 kHz Fs) “Serial Port Clocking” on page 34
512 256 128 128
64 64 64 64
Notes: 1. Slave/Master Mode is determined by the M/S bit in “Master/Slave Mode” on page 46. 2. Certain sample and MCLK frequencies require setting the SPEED[1:0] bits, the 32k_GROUP bit (“32kHz Sample Rate Group” on page 45) and/or the VIDEOCLK bit (“27 MHz Video Clock” on page 45) and RATIO[1:0] bits (“Internal MCLK/LRCK Ratio” on page 45). Low sample rates may also affect dynamic range performance in the typical audio band. Refer to the referenced application for more information. 3. These bits are ignored when the AUTO bit (“Auto-Detect” on page 44) is enabled.
6.5.3
32kHz Sample Rate Group
Specifies whether or not the input/output sample rate is 8 kHz, 16 kHz or 32 kHz.
32kGROUP 8 kHz, 16 kHz or 32 kHz sample rate?
0 1
Application:
No Yes “Serial Port Clocking” on page 34
6.5.4
27 MHz Video Clock
Specifies whether or not the external MCLK frequency is 27 MHz
VIDEOCLK 27 MHz MCLK?
0 1
Application:
No Yes “Serial Port Clocking” on page 34
6.5.5
Internal MCLK/LRCK Ratio
Configures the internal MCLK/LRCK ratio.
RATIO[1:0] Internal MCLK Cycles per LRCK SCLK/LRCK Ratio in Master Mode
00 01 10 11
Application:
128 125 132 136 “Serial Port Clocking” on page 34
64 62 66 68
DS680A1
45
CS42L52
6.5.6 MCLK Divide By 2
Divides the input MCLK by 2 prior to all internal circuitry.
MCLKDIV2 MCLK signal into CODEC
0 1
Application:
No divide Divided by 2 “Serial Port Clocking” on page 34
Note:
In slave mode, this bit is ignored when the AUTO bit (“Auto-Detect” on page 44) is disabled.
6.6
Interface Control 1 (Address 06h)
7 M/S 6 INV_SCLK 5 ADCDIF 4 DSP 3 DACDIF1 2 DACDIF0 1 AWL1 0 AWL0
6.6.1
Master/Slave Mode
Configures the serial port I/O clocking.
M/S Serial Port Clocks
0 1
Slave (input ONLY) Master (output ONLY)
6.6.2
SCLK Polarity
Configures the polarity of the SCLK signal.
INV_SCLK SCLK Polarity
0 1
Not Inverted Inverted
6.6.3
ADC Interface Format
Configures the digital interface format for data on SDOUT.
ADCDIF ADC Interface Format
0 1
Application:
Left Justified I²S “Digital Interface Formats” on page 36
6.6.4
DSP Mode
Configures a data-packed interface format for both the ADC and DAC.
DSP DSP Mode
0 1
Application:
Disabled Enabled “DSP Mode” on page 36
Notes: 1. Select the audio word length using the AWL[1:0] bits (“Audio Word Length” on page 47). 2. The interface format for both the ADC and the DAC must be set to “Left-Justified” when DSP Mode is enabled.
46
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6.6.5 DAC Interface Format
Configures the digital interface format for data on SDIN.
DACDIF[1:0] DAC Interface Format
00 01 10 11
Application:
Left Justified, up to 24-bit data I²S, up to 24-bit data Right Justified Reserved “Digital Interface Formats” on page 36
Note: Select the audio word length for Right Justified using the AWL[1:0] bits (“Audio Word Length” on page 47).
6.6.6
Audio Word Length
Configures the audio sample word length used for the data into SDIN and out of SDOUT.
AWL[1:0] Audio Word Length DSP Mode Right Justified (DAC ONLY)
00 01 10 11
Application:
32-bit data 24-bit data 20-bit data 16-bit data “DSP Mode” on page 36
24-bit data 20-bit data 18-bit data 16-bit data
Note: When the internal MCLK/LRCK ratio is set to 125 in master mode, the 32-bit data width option for DSP Mode is not valid unless SCLK=MCLK.
6.7
Interface Control 2 (Address 07h)
6 SCLK=MCLK 5 DIGLOOP 4 3ST_SP 3 INV_SWCH 2 BIASLVL2 1 BIASLVL1 0 BIASLVL0
7 Reserved
6.7.1
SCLK equals MCLK
Configures the SCLK signal source for master mode.
SCLK=MCLK Output SCLK
0 1
Re-timed signal, synchronously derived from MCLK Non-retimed, MCLK signal
Note:
This bit is only valid for MCLK = 12.0000 MHz.
6.7.2
SDOUT to SDIN Digital Loopback
Configures an internal loops the signal on the SDOUT pin to SDIN.
DIGLOOP Internal Loopback
0 1
Disabled; SDOUT internally disconnected from SDIN Enabled; SDOUT internally connected to SDIN
DS680A1
47
CS42L52
6.7.3 Tri-State Serial Port Interface
Determines the state of the serial port drivers.
3ST_SP Serial Port Status Slave Mode Master Mode
0 1
Serial Port clocks are inputs and SDOUT is output Serial Port clocks are inputs and SDOUT is HI-Z
Serial Port clocks and SDOUT are outputs Serial Port clocks and SDOUT are HI-Z
Notes: 1. Slave/Master Mode is determined by the M/S bit in “Master/Slave Mode” on page 46. 2. When the serial port is tri-stated in master mode, the ADC and DAC serial ports are clocked internally.
6.7.4
Speaker/Headphone Switch Invert
Determines the control signal polarity of the SPK/HP_SW pin.
INV_SWCH SPK/HP_SW pin 6 Control
0 1
Not inverted Inverted
6.7.5
MIC Bias Level
Sets the output voltage level on the MICBIAS output pin.
BIASLVL[2:0] Output Bias Level
000 001 010 011 100 101 110 111
0.5 x VA 0.6 x VA 0.7 x VA 0.8 x VA 0.83 x VA 0.91 x VA Reserved Reserved
6.8
Input x Select: ADCA and PGAA (Address 08h), ADCB and PGAB (Address 09h)
6 ADCASEL1 5 ADCASEL0 4 PGAASEL5 3 PGAASEL4 2 PGAASEL3 1 PGAASEL2 0 PGAASEL1
7 ADCASEL2
6.8.1
ADC Input Select
Selects the specified analog input signal into ADCx.
ADCxSEL[2:0] Selected Input to ADCx
000 001 010 011 100 101 110 111
Application:
AIN1x AIN2x AIN3x AIN4x PGAx - Use PGAxSEL bits (“PGA Input Mapping” on page 49) to select input channels Reserved Reserved Reserved “Analog Inputs” on page 26
48
DS680A1
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6.8.2 PGA Input Mapping
Selects one or sums/mixes the analog input signal into the PGA. Each bit of the PGAx_SEL[5:1] word corresponds to individual channels (i.e. PGAx_SEL1 selects AIN1x, PGAx_SEL2 selects AIN2x, etc.).
PGAxSEL[5:1] Selected Input to PGAx (Examples)
00000 00001 00010 00100 01000 10000 10001 10011
Application:
No inputs selected AIN1x AIN2x AIN3x AIN4x MICx; for single-ended MIC inputs, use MICxSEL (“MIC x Select” on page 54) to select MIC 1 or MIC 2; for differential MIC inputs, enable MICxCFG (“MICx Configuration” on page 55) MICx + AIN1x MICx + AIN1x + AIN2x “Analog Inputs” on page 26
Note: Table does not show all possible combinations.
6.9
Analog & HPF Control (Address 0Ah)
7 HPFB 6 HPFRZB 5 HPFA 4 HPFRZA 3 ANLGSFTB 2 ANLGZCB 1 ANLGSFTA 0 ANLGZCA
6.9.1
ADCx High-Pass Filter
Configures the internal high-pass filter after ADCx.
HPFx High Pass Filter Status
0 1
Disabled Enabled
6.9.2
ADCx High-Pass Filter Freeze
Configures the high pass filter’s digital DC subtraction and/or calibration after ADCx.
HPFRZx High Pass Filter Digital Subtraction
0 1
Continuous DC Subtraction Frozen DC Subtraction
6.9.3
Ch. x Analog Soft Ramp
Configures an incremental volume ramp from the current level to the new level at the specified rate.
ANLGSFTx Volume Changes Affected Analog Volume Controls
0 1
Ramp Rate:
Do not occur with a soft ramp Occur with a soft ramp 1/2 dB every 16 LRCK cycles
MICxGAIN[4:0] (“MICx Gain” on page 55), PGAxVOL[5:0] (“PGAx Volume” on page 56), and PASSxVOL[7:0] (“Passthru x Volume” on page 56)
6.9.4
Ch. x Analog Zero Cross
Configures when the signal level changes occur for the analog volume controls.
ANLGZCx Volume Changes Affected Analog Volume Controls
0 1
Do not occur on a zero crossing Occur on a zero crossing
MICxGAIN[4:0] (“MICx Gain” on page 55), PGAxVOL[5:0] (“PGAx Volume” on page 56), and PASSxVOL[7:0] (“Passthru x Volume” on page 56)
Note: If the signal does not encounter a zero crossing, the requested volume change will occur after a timeout period of 1024 sample periods (approximately 10.7 ms at 48 kHz sample rate). DS680A1 49
CS42L52
6.10 ADC HPF Corner Frequency (Address 0Bh)
6 Reserved 5 Reserved 4 Reserved 3 HPFB_CF1 2 HPFB_CF0 1 HPFA_CF1 0 HPFA_CF0
7 Reserved
6.10.1 HPF x Corner Frequency
Sets the corner frequency (-3 dB point) for the internal High-Pass Filter (HPF).
HPFx_CF[1:0] HPF Corner Frequency Setting (Fs=48 kHz)
00 01 10 11
Normal setting as specified in “ADC Digital Filter Characteristics” on page 14 119 Hz 236 Hz 464 Hz
6.11
Misc. ADC Control (Address 0Ch)
6 DIGMUX 5 DIGSUM1 4 DIGSUM0 3 INV_ADCB 2 INV_ADCA 1 ADCBMUTE 0 ADCAMUTE
7 ADCB=A
6.11.1
ADC Channel B=A
Configures independent or ganged control of the MIC, PGA, Passthru, ADC and the ALC.
ADCB=A Single Volume Control
0 1
Disabled Enabled
6.11.2
Digital MUX
Selects the signal source for the ADC serial port
DIGMUX SDOUT Signal Source
0 1
ADC DSP
6.11.3
Digital Sum
Configures a mix/swap of ADCA and ADCB.
DIGSUM[1:0] Serial Output Signal Left Channel Right Channel
00 01 10 11
ADCA (ADCA + ADCB)/2 (ADCA - ADCB)/2 ADCB
ADCB (ADCA + ADCB)/2 (ADCA - ADCB)/2 ADCA
6.11.4
Invert ADC Signal Polarity
Configures the polarity of the ADC signal.
INV_ADCx ADC Signal Polarity
0 1
Not Inverted Inverted
50
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6.11.5 ADC Mute
Configures a digital mute on ADC channel x.
ADCxMUTE ADC Mute
0 1
Not Inverted Inverted
6.12
Playback Control 1 (Address 0Dh)
6 HPGAIN1 5 HPGAIN0 4 PLYBCKB=A 3 INV_PCMB 2 INV_PCMA 1 MSTBMUTE 0 MSTAMUTE
7 HPGAIN2
6.12.1 Headphone Analog Gain
Selects the gain multiplier for the headphone/line outputs.
HPGAIN[2:0] Headphone/Line Gain Setting (G)
000 001 010 011 100 101 110 111
0.3959 0.4571 0.5111 0.6047 0.7099 0.8399 1.000 1.1430
Note: Refer to “Line Output Voltage Level Characteristics” on page 18 and “Headphone Output Power Characteristics” on page 19.
6.12.2 Playback Volume Setting B=A
Configures independent or ganged volume control of all playback channels.
PLYBCKB=A Single Volume Control for all Playback Channels
0 1
Disabled Enabled
6.12.3 Invert PCM Signal Polarity
Configures the polarity of the digital input signal.
INV_PCMx PCM Signal Polarity
0 1
Not Inverted Inverted
6.12.4 Master Playback Mute
Configures a digital mute on the master volume control for channel x.
MSTxMUTE Master Mute
0 1
Not Inverted Inverted
Note: The muting function is affected by the DIGSFT (“Digital Soft Ramp” on page 53) and DIGZC (“Digital Zero Cross” on page 53) bits. DS680A1 51
CS42L52
6.13 Miscellaneous Controls (Address 0Eh)
3 FREEZE 2 DEEMPH 1 DIGSFT 0 DIGZC 7 6 5 4 PASSTHRUB PASSTHRUA PASSBMUTE PASSAMUTE
6.13.1 Passthru Analog
Configures an analog passthru from the PGA inputs to the headphone/line outputs.
PASSTHRUx Analog In Routed to HP/Line Output
0 1
Disabled Enabled
Notes: 1. The Passthru volume control is realized using a combination of the PGA volume control settings (“PGAx Volume” on page 56) and the headphone amplifier volume control settings (hidden). When passthru is enabled and the PGA to ADC path is selected, the signal seen by the ADC will change depending on the passthru volume setting.
6.13.2 Passthru Mute
Configures an analog mute on the channel x analog in to analog out passthru.
PASSxMUTE Passthru Mute
0 1
Disabled Enabled
6.13.3 Freeze Registers
Configures a hold on all register settings.
FREEZE Control Port Status
0 1
Register changes take effect immediately Modifications may be made to all control port registers without the changes taking effect until after the FREEZE is disabled.
6.13.4 HP/Speaker De-Emphasis
Configures a 15μs/50μs digital de-emphasis filter response on the headphone/line and speaker outputs.
DEEMPHASIS Control Port Status
0 1
Disabled Enabled
52
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6.13.5 Digital Soft Ramp
Configures an incremental volume ramp from the current level to the new level at the specified rate.
DIGSFT Volume Changes Affected Digital Volume Controls
0
Do not occur on a zero crossing
1
Occur on a zero crossing
MSTxMUTE (“Master Playback Mute” on page 51), HPxMUTE, SPKxMUTE (“Playback Control 2 (Address 0Fh)” on page 53), ADCxVOL[7:0] (“ADCx Volume” on page 57), AMIXxMUTE, AMIXxVOL[7:0] (“ADC Mixer Channel x Volume” on page 58), PMIXxMUTE, PMIXxVOL[7:0] (“PCM Mixer Channel x Volume” on page 58), MSTxVOL[7:0] (“Master Volume Control” on page 63), HPxVOL[7:0] (“Headphone Volume Control” on page 63), SPKxVOL[7:0] (“Speaker Volume Control” on page 64), ALC and Limiter Attack/Release (page 66 to page 68)
Ramp Rate:
1/8 dB every LRCK cycle
6.13.6 Digital Zero Cross
Configures when the signal level changes occur for the digital volume controls.
DIGZC Volume Changes Affected Digital Volume Controls
0
Do not occur on a zero crossing
1
Occur on a zero crossing
MSTxMUTE (“Master Playback Mute” on page 51), HPxMUTE, SPKxMUTE (“Playback Control 2 (Address 0Fh)” on page 53), ADCxVOL[7:0] (“ADCx Volume” on page 57), AMIXxMUTE, AMIXxVOL[7:0] (“ADC Mixer Channel x Volume” on page 58), PMIXxMUTE, PMIXxVOL[7:0] (“PCM Mixer Channel x Volume” on page 58), MSTxVOL[7:0] (“Master Volume Control” on page 63), HPxVOL[7:0] (“Headphone Volume Control” on page 63), SPKxVOL[7:0] (“Speaker Volume Control” on page 64), ALC and Limiter Attack/Release (page 66 to page 68)
Notes: 1. If the signal does not encounter a zero crossing, the requested volume change will occur after a timeout period between 1024 and 2048 sample periods (21.3 ms to 42.7 ms at 48 kHz sample rate). 2. The zero cross function is independently monitored and implemented for each channel. 3. The DIS_LIMSFT bit (“Limiter Soft Ramp Disable” on page 65) is ignored when zero cross is enabled.
6.14
Playback Control 2 (Address 0Fh)
6 HPAMUTE 5 SPKBMUTE 4 SPKAMUTE 3 SPKB=A 2 SPKSWAP 1 SPKMONO 0 MUTE50/50
7 HPBMUTE
6.14.1 Headphone Mute
Configures a digital mute on headphone channel x.
HPxMUTE Headphone Mute
0 1
Disabled Enabled
6.14.2 Speaker Mute
Configures a digital mute on speaker channel x.
SPKxMUTE Speaker Mute
0 1
Disabled Enabled
DS680A1
53
CS42L52
6.14.3 Speaker Volume Setting B=A
Configures independent or ganged volume control of the speaker volume and mute.
SPKB=A Single Volume Control for the Speaker Channel
0 1
Disabled Enabled
6.14.4 Speaker Channel Swap
Configures a channel swap on the speaker channels.
SPKSWAP Speaker Output
0 1
Application:
Channel A Channel B “Mono Speaker Output Configuration” on page 33
6.14.5 Speaker MONO Control
Configures a parallel full bridge output for the speaker channels.
SPKMONO Parallel Full Bridge Output
0 1
Application:
Disabled Enabled “Mono Speaker Output Configuration” on page 33
6.14.6 Speaker Mute 50/50 Control
Configures how the speaker channels mute.
MUTE50/50 Speaker Mute 50/50
0 1
Disabled; The PWM amplifiers outputs modulated silence when SPKxMUTE is enabled. Enabled; The PWM amplifiers switch at an exact 50%-duty-cycle signal (not modulated) when SPKxMUTE is enabled.
6.15
MICx Amp Control: MIC A (Address 10h) & MIC B (Address 11h)
6 MICxSEL 5 MICxCFG 4 MICxGAIN4 3 MICxGAIN3 2 MICxGAIN2 1 MICxGAIN1 0 MICxGAIN0
7 Reserved
6.15.1 MIC x Select
Selects one of two single-ended MIC inputs on channel x.
MICxSEL MIC x Selection
0 1
Application:
MIC 1x MIC 2x “MIC Inputs” on page 27
54
DS680A1
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6.15.2 MICx Configuration
Configures the input topology for MICx.
MICxCFG MIC Input Topology
0 1
Application:
Single-Ended Differential “MIC Inputs” on page 27
6.15.3 MICx Gain
Sets the gain of the microphone pre-amplifier.
MICxGAIN[4:0] Gain
11111 ... 10000 ... 00000
Step Size: Application:
32 dB ... 32 dB ... 16 dB 1 dB “MIC Inputs” on page 27
6.16
PGAx Vol. & ALCx Transition Ctl.: ALC, PGA A (Address 12h) & ALC, PGA B (Address 13h)
6 ALCxZCDIS 5 PGAxVOL5 4 PGAxVOL4 3 PGAxVOL3 2 PGAxVOL2 1 PGAxVOL1 0 PGAxVOL0
7 ALCxSRDIS
6.16.1 ALCx Soft Ramp Disable
Configures an override of the analog soft ramp setting.
ALCxSRDIS ALC Soft Ramp Disable
0 1
Application:
OFF; ALC Attack Rate is dictated by the ANLGSFT (“Ch. x Analog Soft Ramp” on page 49) setting ON; ALC volume changes take effect in one step, regardless of the ANLGSFT setting. “Automatic Level Control (ALC)” on page 27
6.16.2 ALCx Zero Cross Disable
Configures an override of the analog zero cross setting.
ALCxZCDIS ALC Zero Cross Disable
0 1
Application:
OFF; ALC Attack Rate is dictated by the ANLGZC (“Ch. x Analog Zero Cross” on page 49) setting ON; ALC volume changes take effect at any time, regardless of the ANLGZC setting. “Automatic Level Control (ALC)” on page 27
DS680A1
55
CS42L52
6.16.3 PGAx Volume
Sets the volume/gain of the Programmable Gain Amplifier (PGA).
PGAxVOL[5:0] Volume
01 1111 ... 01 1000 ... 00 0001 00 0000 11 1111 ... 10 1000 ... 10 0000
Step Size:
12 dB ... 12 dB ... +0.5 dB 0 dB -0.5 dB ... -6.0 dB ... -6.0 dB 0.5 dB
Note: abled.
The PGAxVOL bits are ignored when the PASSTHRUx bit (“Passthru Analog” on page 52) is en-
6.17
Passthru x Volume: PASSAVOL (Address 14h) & PASSBVOL (Address 15h)
6 PASSxVOL6 5 PASSxVOL5 4 PASSxVOL4 3 PASSxVOL3 2 PASSxVOL2 1 PASSxVOL1 0 PASSxVOL0
7 PASSxVOL7
6.17.1 Passthru x Volume
Sets the volume/gain of the signal routed from the PGA to the headphone/line output.
PASSxVOL[7:0] Gain
0111 1111 ... 0001 1000 ... 0000 0001 0000 0000 11111 1111 ... 1000 1000 ... 1000 0000
Step Size: Application:
12 dB ... 12 dB ... +0.5 dB 0 dB -0.5 dB ... -60.0 dB ... -60.0 dB 0.5 dB (approximate) “Analog In to Analog Out Passthru” on page 32
Notes: 1. This register is ignored when the PASSTHRUx bit (“Passthru Analog” on page 52) is disabled. 2. The step size may deviate from 0.5 dB at settings below -40 dB. Code settings 0x95, 0xA1, 0xAD and 0xB9 are not guaranteed to be monotonic.
56
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6.18 ADCx Volume Control: ADCAVOL (Address 16h) & ADCBVOL (Address 17h)
6 ADCAVOL6 5 ADCAVOL5 4 ADCAVOL4 3 ADCAVOL3 2 ADCAVOL2 1 ADCAVOL1 0 ADCAVOL0 7 ADCAVOL7
6.18.1 ADCx Volume
Sets the volume of the ADC signal out the serial data output (SDOUT).
ADCxVOL[7:0] Volume
0111 1111 ... 0001 1000 ... 0000 0000 1111 1111 1111 1110 ... 1010 0000 ... 1000 0000
Step Size:
24 dB ... 24 dB ... 0 dB -1.0 dB -2.0 dB ... -96.0 dB ... -96.0 dB 1.0 dB
DS680A1
57
CS42L52
6.19 ADCx Mixer Volume: ADCA (Address 18h) & ADCB (Address 19h)
6 AMIXxVOL6 5 AMIXxVOL5 4 AMIXxVOL4 3 AMIXxVOL3 2 AMIXxVOL2 1 AMIXxVOL1 0 AMIXxVOL0 7 AMIXxMUTE
6.19.1 ADC Mixer Channel x Mute
Configures a digital mute on the ADC mix in the DSP.
AMIXxMUTE ADC Mixer Mute
0 1
Disabled Enabled
6.19.2 ADC Mixer Channel x Volume
Sets the volume/gain of the ADC mix in the DSP.
AMIXxVOL[6:0] Volume
001 1000 ... 000 0001 000 0000 111 1111 ... 001 1001
Step Size:
+12.0 dB ... +0.5 dB 0 dB -0.5 dB ... -51.5 dB 0.5 dB
6.20
PCMx Mixer Volume: PCMA (Address 1Ah) & PCMB (Address 1Bh)
6 PMIXxVOL6 5 PMIXxVOL5 4 PMIXxVOL4 3 PMIXxVOL3 2 PMIXxVOL2 1 PMIXxVOL1 0 PMIXxVOL0
7 PMIXxMUTE
6.20.1 PCM Mixer Channel x Mute
Configures a digital mute on the PCM mix from the serial data input (SDIN) to the DSP.
PMIXxMUTE PCM Mixer Mute
0 1
Disabled Enabled
6.20.2 PCM Mixer Channel x Volume
Sets the volume/gain of the PCM mix from the serial data input (SDIN) to the DSP.
PMIXxVOL[6:0] Volume
001 1000 ... 000 0001 000 0000 111 1111 ... 001 1001
Step Size:
+12.0 dB ... +0.5 dB 0 dB -0.5 dB ... -51.5 dB 0.5 dB
58
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6.21 Beep Frequency & On Time (Address 1Ch)
6 FREQ2 5 FREQ1 4 FREQ0 3 ONTIME3 2 ONTIME2 1 ONTIME1 0 ONTIME0 7 FREQ3
6.21.1 Beep Frequency
Sets the frequency of the beep signal.
FREQ[3:0] Frequency (Fs = 12, 24, 48 or 96 kHz) Pitch
0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111
Application:
260.87 Hz 521.74 Hz 585.37 Hz 666.67 Hz 705.88 Hz 774.19 Hz 888.89 Hz 1000.00 Hz 1043.48 Hz 1200.00 Hz 1333.33 Hz 1411.76 Hz 1600.00 Hz 1714.29 Hz 2000.00 Hz 2181.82 Hz “Beep Generator” on page 30
C4 C5 D5 E5 F5 G5 A5 B5 C6 D6 E6 F6 G6 A6 B6 C7
Notes: 1. This setting must not change when BEEP is enabled. 2. Beep frequency will scale directly with sample rate, Fs, but is fixed at the nominal Fs within each speed mode.
DS680A1
59
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6.21.2 Beep On Time
Sets the on duration of the beep signal.
ONTIME[3:0] On Time (Fs = 12, 24, 48 or 96 kHz)
0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111
Application:
~86 ms ~430 ms ~780 ms ~1.20 s ~1.50 s ~1.80 s ~2.20 s ~2.50 s ~2.80 s ~3.20 s ~3.50 s ~3.80 s ~4.20 s ~4.50 s ~4.80 s ~5.20 s “Beep Generator” on page 30
Notes: 1. This setting must not change when BEEP is enabled. 2. Beep on time will scale inversely with sample rate, Fs, but is fixed at the nominal Fs within each speed mode.
6.22
Beep Volume & Off Time (Address 1Dh)
6 OFFTIME1 5 OFFTIME0 4 BPVOL4 3 BPVOL3 2 BPVOL2 1 BPVOL1 0 BPVOL0
7 OFFTIME2
6.22.1 Beep Off Time
Sets the off duration of the beep signal.
OFFTIME[2:0] Off Time (Fs = 48 or 96 kHz)
000 001 010 011 100 101 110 111
Application:
~1.23 s ~2.58 s ~3.90 s ~5.20 s ~6.60 s ~8.05 s ~9.35 s ~10.80 s “Beep Generator” on page 30
Notes: 1. This setting must not change when BEEP is enabled. 2. Beep off time will scale inversely with sample rate, Fs, but is fixed at the nominal Fs within each speed mode. 60 DS680A1
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6.22.2 Beep Volume
Sets the volume of the beep signal.
BEEPVOL[4:0] Gain
00110 ··· 00000 11111 11110 ··· 00111
Step Size: Application:
+12.0 dB ··· 0 dB -2 dB -4 dB ··· -50 dB 2 dB “Beep Generator” on page 30
Note:
This setting must not change when BEEP is enabled.
6.23
Beep & Tone Configuration (Address 1Eh)
6 BEEP0 5 BEEPMIXDIS 4 TREBCF1 3 TREBCF0 2 BASSCF1 1 BASSCF0 0 TCEN
7 BEEP1
6.23.1 Beep Configuration
Configures a beep mixed with the HP/Line and SPK output.
BEEP[1:0] Beep Occurrence
00 01 10 11
Application:
Off Single Multiple Continuous “Beep Generator” on page 30
Notes: 1. When used in analog pass through mode, the output alternates between the signal from the PGA and the beep signal. The beep signal does not mix with the analog signal from the PGA. 2. Re-engaging the beep before it has completed its initial cycle will cause the beep signal to remain ON for the maximum ONTIME duration.
6.23.2 Beep Mix Disable
Configures how the beep mixes with the serial data input.
BEEPMIXDIS Beep Output to HP/Line and Speaker
0 1
Application:
Mix Enabled; The beep signal mixes with the digital signal from the serial data input. Mix Disabled; The output alternates between the signal from the serial data input and the beep signal. The beep signal does not mix with the digital signal from the serial data input. “Beep Generator” on page 30
Note:
This setting must not change when BEEP is enabled.
DS680A1
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6.23.3 Treble Corner Frequency
Sets the corner frequency (-3 dB point) for the treble shelving filter.
TREBCF[1:0] Treble Corner Frequency Setting
00 01 10 11
5 kHz 7 kHz 10 kHz 15 kHz
6.23.4 Bass Corner Frequency
Sets the corner frequency (-3 dB point) for the bass shelving filter.
BASSCF[1:0] Bass Corner Frequency Setting
00 01 10 11
50 Hz 100 Hz 200 Hz 250 Hz
6.23.5 Tone Control Enable
Configures the treble and bass activation.
TCEN Bass and Treble Control
0 1
Application:
Disabled Enabled “Beep Generator” on page 30
6.24
Tone Control (Address 1Fh)
6 TREB2 5 TREB1 4 TREB0 3 BASS3 2 BASS2 1 BASS1 0 BASS0
7 TREB3
6.24.1 Treble Gain
Sets the gain of the treble shelving filter.
TREB[3:0] Gain Setting
0000 ··· 0111 1000 1001 ··· 1111
Step Size:
+12.0 dB ··· +1.5 dB 0 dB -1.5 dB ··· -10.5 dB 1.5 dB
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6.24.2 Bass Gain
Sets the gain of the bass shelving filter.
TREB[3:0] Gain Setting
0000 ··· 0111 1000 1001 ··· 1111
Step Size:
+12.0 dB ··· +1.5 dB 0 dB -1.5 dB ··· -10.5 dB 1.5 dB
6.25
Master Volume Control: MSTA (Address 20h) & MSTB (Address 21h)
6 MSTxVOL6 5 MSTxVOL5 4 MSTxVOL4 3 MSTxVOL3 2 MSTxVOL2 1 MSTxVOL1 0 MSTxVOL0
7 MSTxVOL7
6.25.1 Master Volume Control
Sets the volume of the signal out the DSP.
MSTxVOL[7:0] Master Volume
0001 1000 ··· 0000 0000 1111 1111 1111 1110 ··· 0011 0100 ··· 0001 1001
Step Size:
+12.0 dB ··· 0 dB -0.5 dB -1.0 dB ··· -102 dB ··· -102 dB 0.5 dB
6.26
Headphone Volume Control: HPA (Address 22h) & HPB (Address 23h)
6 HPxVOL6 5 HPxVOL5 4 HPxVOL4 3 HPxVOL3 2 HPxVOL2 1 HPxVOL1 0 HPxVOL0
7 HPxVOL7
6.26.1 Headphone Volume Control
Sets the volume of the signal out the DAC.
HPxVOL[7:0] Headphone Volume
0000 0000 1111 1111 1111 1110 ··· 0011 0100 ··· 0000 0001
Step Size:
0 dB -0.5 dB -1.0 dB ··· -96.0 dB ··· Muted 0.5 dB
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6.27 Speaker Volume Control: SPKA (Address 24h) & SPKB (Address 25h)
6 SPKxVOL6 5 SPKxVOL5 4 SPKxVOL4 3 SPKxVOL3 2 SPKxVOL2 1 SPKxVOL1 0 SPKxVOL0 7 SPKxVOL7
6.27.1 Speaker Volume Control
Sets the volume of the signal out the PWM modulator.
SPKxVOL[7:0] Speaker Volume
0000 0000 1111 1111 1111 1110 ··· 0100 0000 ··· 0000 0001
Step Size:
0 dB -0.5 dB -1.0 dB ··· -96.0 dB ··· Muted 0.5 dB
6.28
ADC & PCM Channel Mixer (Address 26h)
6 PCMASWP0 5 PCMBSWP1 4 PCMBSWP0 3 ADCASWP1 2 ADCASWP0 1 ADCBSWP1 0 ADCBSWP0
7 PCMASWP1
6.28.1 PCM Mix Channel Swap
Configures a mix/swap of the PCM Mix to the headphone/line or speaker outputs.
PCMxSWP[1:0] PCM Mix to HP/LINEOUTA PCM Mix to HP/LINEOUTB
00 01 10 11
Left (Left + Right)/2 Right
Right (Left + Right)/2 Left
6.28.2 ADC Mix Channel Swap
Configures a mix/swap of the ADC Mix to the headphone/line or speaker outputs.
ADCxSWP[1:0] ADC Mix to HP/LINEOUTA Channel ADC Mix to HP/LINEOUTB Channel
00 01 10 11
Left (Left + Right)/2 Right
Right (Left + Right)/2 Left
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6.29 Limiter Control 1, Min/Max Thresholds (Address 27h)
6 LMAX1 5 LMAX0 4 CUSH2 3 CUSH1 2 CUSH0 1 LIMSRDIS 0 LIMZCDIS 7 LMAX2
6.29.1 Limiter Maximum Threshold
Sets the maximum level, below full scale, at which to limit and attenuate the output signal at the attack rate (LIMARATE - “Limiter Release Rate” on page 66).
LMAX[2:0] Threshold Setting
000 001 010 011 100 101 110 111
Application:
0 dB -3 dB -6 dB -9 dB -12 dB -18 dB -24 dB -30 dB “Limiter” on page 31
Note: Bass, Treble and digital gain settings that boost the signal beyond the maximum threshold may trigger an attack.
6.29.2 Limiter Cushion Threshold
Sets the minimum level at which to disengage the Limiter’s attenuation at the release rate (LIMRRATE “Limiter Release Rate” on page 66) until levels lie between the LMAX and CUSH thresholds.
CUSH[2:0] Threshold Setting
000 001 010 011 100 101 110 111
Application:
0 dB -3 dB -6 dB -9 dB -12 dB -18 dB -24 dB -30 dB “Limiter” on page 31
Note:
This setting is usually set slightly below the LMAX threshold.
6.29.3 Limiter Soft Ramp Disable
Configures an override of the digital soft ramp setting.
LIMSRDIS Limiter Soft Ramp Disable
0 1
Application:
OFF; Limiter Attack Rate is dictated by the DIGSFT (“Digital Soft Ramp” on page 53) setting ON; Limiter volume changes take effect in one step, regardless of the DIGSFT setting. “Limiter” on page 31
Note:
This bit is ignored when the DIGZC (“Digital Zero Cross” on page 53) is enabled.
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6.29.4 Limiter Zero Cross Disable
Configures an override of the digital zero cross setting.
LIMZCDIS Limiter Zero Cross Disable
0 1
Application:
OFF; Limiter Attack Rate is dictated by the DIGZC (“Digital Zero Cross” on page 53) setting ON; Limiter volume changes take effect in one step, regardless of the DIGZC setting. “Limiter” on page 31
6.30
Limiter Control 2, Release Rate (Address 28h)
6 LIMIT_ALL 5 LIMRRATE5 4 LIMRRATE4 3 LIMRRATE3 2 LIMRRATE2 1 LIMRRATE1 0 LIMRRATE0
7 LIMIT
6.30.1 Peak Detect and Limiter
Configures the peak detect and limiter circuitry.
LIMIT Limiter Status
0 1
Application:
Disabled Enabled “Limiter” on page 31
6.30.2 Peak Signal Limit All Channels
Sets how channels are attenuated when the limiter is enabled.
LIMIT_ALL Limiter action:
0
Apply the necessary attenuation on a specific channel only when the signal amplitude on that specific channel rises above LMAX. Remove attenuation on a specific channel only when the signal amplitude on that specific channel falls below CUSH. Apply the necessary attenuation on BOTH channels when the signal amplitude on any ONE channel rises above LMAX. Remove attenuation on BOTH channels only when the signal amplitude on BOTH channels fall below CUSH. “Limiter” on page 31
1
Application:
6.30.3 Limiter Release Rate
Sets the rate at which the limiter releases the digital attenuation from levels below the CUSH[2:0] threshold (“Limiter Cushion Threshold” on page 65) and returns the analog output level to the MSTxVOL[7:0] (“Master Volume Control” on page 63) setting.
LIMRRATE[5:0] Release Time
00 0000 ··· 11 1111
Application:
Fastest Release ··· Slowest Release “Limiter” on page 31
Note: The limiter release rate is user-selectable but is also a function of the sampling frequency, Fs, and the DIGSFT (“Digital Soft Ramp” on page 53) and DIGZC (“Digital Zero Cross” on page 53) setting.
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6.31 Limiter Attack Rate (Address 29h)
6 Reserved 5 LIMARATE5 4 LIMARATE4 3 LIMARATE3 2 LIMARATE2 1 LIMARATE1 0 LIMARATE0 7 Reserved
6.31.1 Limiter Attack Rate
Sets the rate at which the limiter applies digital attenuation from levels above the MAX[2:0] threshold (“Limiter Maximum Threshold” on page 65).
LIMARATE[5:0] Attack Time
00 0000 ··· 11 1111
Application:
Fastest Attack ··· Slowest Attack “Limiter” on page 31
Note: The limiter attack rate is user-selectable but is also a function of the sampling frequency, Fs, and the DIGSFT (“Digital Soft Ramp” on page 53) and DIGZC (“Digital Zero Cross” on page 53) setting unless the respective disable bit (“Limiter Soft Ramp Disable” on page 65 or “Limiter Zero Cross Disable” on page 66) is enabled.
6.32
ALC Enable & Attack Rate (Address 2Ah)
6 ALCA 5 ALCARATE5 4 AALCRATE4 3 ALCARATE3 2 ALCARATE2 1 ALCARATE1 0 ALCARATE0
7 ALCB
6.32.1 ALCx Enable
Configures the automatic level controller.
ALC ALC Status
0 1
Application:
Disabled Enabled “Automatic Level Control (ALC)” on page 27
6.32.2 ALC Attack Rate
Sets the rate at which the ALC applies analog and/or digital attenuation from levels above the AMAX[2:0] threshold (“ALC Maximum Threshold” on page 68).
LIMARATE[5:0] Attack Time
00 0000 ··· 11 1111
Application:
Fastest Attack ··· Slowest Attack “Automatic Level Control (ALC)” on page 27
Note: The ALC attack rate is user-selectable but is also a function of the sampling frequency, Fs, and the ANLGSFTx (“Ch. x Analog Soft Ramp” on page 49) and ANLGZCx (“Ch. x Analog Zero Cross” on page 49) setting unless the respective disable bit (“ALCx Soft Ramp Disable” on page 55 or “ALCx Zero Cross Disable” on page 55) is enabled.
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6.33 ALC Release Rate (Address 2Bh)
6 Reserved 5 ALCRRATE5 4 ALCRRATE4 3 ALCRRATE3 2 ALCRRATE2 1 ALCRRATE1 0 ALCRRATE0 7 Reserved
6.33.1 ALC Release Rate
Sets the rate at which the ALC releases the analog and/or digital attenuation from levels below the MIN[2:0] threshold (“ALC Minimum Threshold” on page 69) and returns the signal level to the PGAxVOL[5:0] (“PGAx Volume” on page 56) and ADCxVOL[7:0] (“ADCx Volume” on page 57) setting.
ALCRRATE[5:0] Release Time
00 0000 ··· 11 1111
Application:
Fastest Release ··· Slowest Release “Automatic Level Control (ALC)” on page 27
Notes: 1. The ALC release rate is user-selectable but is also a function of the sampling frequency, Fs, and the ANLGSFTx (“Ch. x Analog Soft Ramp” on page 49) and ANLGZCx (“Ch. x Analog Zero Cross” on page 49) setting. 2. The Release Rate setting must always be slower than the Attack Rate.
6.34
ALC Threshold (Address 2Ch)
6 ALCMAX1 5 ALCMAX0 4 ALCMIN2 3 ALCMIN1 2 ALCMIN0 1 Reserved 0 Reserved
7 ALCMAX2
6.34.1 ALC Maximum Threshold
Sets the maximum level, below full scale, at which to limit and attenuate the input signal at the attack rate (ALCARATE - “ALC Attack Rate” on page 67).
MAX[2:0] Threshold Setting
000 001 010 011 100 101 110 111
Application:
0 dB -3 dB -6 dB -9 dB -12 dB -18 dB -24 dB -30 dB “Automatic Level Control (ALC)” on page 27
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6.34.2 ALC Minimum Threshold
Sets the minimum level at which to disengage the ALC’s attenuation or amplify the input signal at the release rate (ALCRRATE - “ALC Release Rate” on page 68) until levels lie between the ALCMAX and ALCMIN thresholds.
ALCMIN[2:0] Threshold Setting
000 001 010 011 100 101 110 111
Application:
0 dB -3 dB -6 dB -9 dB -12 dB -18 dB -24 dB -30 dB “Automatic Level Control (ALC)” on page 27
Note:
This setting is usually set slightly below the ALCMAX threshold.
6.35
Noise Gate Control (Address 2Dh)
6 NG 5 NG_BOOST 4 THRESH2 3 THRESH1 2 THRESH0 1 NGDELAY1 0 NGDELAY0
7 NGALL
6.35.1 Noise Gate All Channels
Sets which channels are attenuated when clipping on any single channel occurs.
NGALL Noise Gate triggered by:
0 1
Application:
Individual channel; Any channel that falls below the threshold setting triggers the noise gate attenuation for both channels. Both channels A & B; Both channels must fall below the threshold setting for the noise gate attenuation to take effect. “Noise Gate” on page 28
6.35.2 Noise Gate Enable
Configures the noise gate.
NG Noise Gate Status
0 1
Application:
Disabled Enabled “Noise Gate” on page 28
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6.35.3 Noise Gate Threshold and Boost
THRESH sets the threshold level of the noise gate. Input signals below the threshold level will be attenuated to -96 dB. NG_BOOST configures a +30 dB boost to the threshold settings.
THRESH[2:0] Minimum Setting (NG_BOOST = ‘0’b) Minimum Setting (NG_BOOST = ‘1’b)
000 001 010 011 100 101 110 111
Application:
-64 dB -67 dB -70 dB -73 dB -76 dB -82 dB Reserved Reserved “Noise Gate” on page 28
-34 dB -37 dB -40 dB -43 dB -46 dB -52 dB -58 dB -64 dB
6.35.4 Noise Gate Delay Timing
Sets the delay time before the noise gate attacks.
NGDELAY[1:0] Delay Setting
00 01 10 11
Application:
50 ms 100 ms 150 ms 200 ms “Noise Gate” on page 28
Note: The Noise Gate attack rate is a function of the sampling frequency, Fs, and the ANLGSFTx (“Ch. x Analog Soft Ramp” on page 49) and ANLGZCx (“Ch. x Analog Zero Cross” on page 49) setting unless the respective disable bit (“ALCx Soft Ramp Disable” on page 55 or “ALCx Zero Cross Disable” on page 55) is enabled.
6.36
Status (Address 2Eh) (Read Only)
For all bits in this register, a “1” means the associated error condition has occurred at least once since the register was last read. A”0” means the associated error condition has NOT occurred since the last reading of the register. Reading the register resets all bits to 0.
7 Reserved
6 SPCLKERR
5 DSPAOVFL
4 DSPBOVFL
3 PCMAOVFL
2 PCMBOVFL
1 ADCAOVFL
0 ADCBOVFL
6.36.1 Serial Port Clock Error (Read Only)
Indicates the status of the MCLK to LRCK ratio.
SPCLKERR Serial Port Clock Status:
0 1
Application:
MCLK/LRCK ratio is valid. MCLK/LRCK ratio is not valid. “Serial Port Clocking” on page 34
Note: nizes.
On initial power up and application of clocks, this bit will report ‘1’b as the serial port re-synchro-
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6.36.2 DSP Engine Overflow (Read Only)
Indicates the over-range status in the DSP data path.
DSPxOVFL DSP Overflow Status:
0 1
Application:
No digital clipping has occurred in the data path after the DSP. Digital clipping has occurred in the data path after the DSP. “Analog Outputs” on page 29
6.36.3 PCMx Overflow (Read Only)
Indicates the over-range status in the PCM mix data path.
PCMxOVFL PCM Overflow Status:
0 1
Application:
No digital clipping has occurred in the data path of the PCM mix (“PCM Mixer Channel x Volume” on page 58) of the DSP. Digital clipping has occurred in the data path of the PCM mix of the DSP. “Analog Outputs” on page 29
6.36.4 ADCx Overflow (Read Only)
Indicates the over-range status in the ADC signal path.
ADCxOVFL ADC Overflow Status:
0 1
Application:
No clipping has occurred anywhere in the ADC signal path. Clipping has occurred in the ADC signal path. “Analog Inputs” on page 26
6.37
Battery Compensation (Address 2Fh)
6 VPMONITOR 5 Reserved 4 Reserved 3 VPREF3 2 VPREF2 1 VPREF1 0 VPREF0
7 BATTCMP
6.37.1 Battery Compensation
Configures automatic adjustment of the speaker volume when VP deviates from VPREF[3:0].
BATTCMP Automatic Battery Compensation
0 1
Application:
Disabled Enabled “Maintaining a Desired Output Level” on page 34
6.37.2 VP Monitor
Configures the internal ADC that monitors the VP voltage level.
VPMONITOR VP ADC Status
0 1
Disabled Enabled
Note: The internal ADC that monitors the VP supply is enabled automatically when BATTCMP is enabled, regardless of the VPMONITOR setting. Conversely, when BATTCMP is disabled, the ADC may be enabled by enabling VPMONITOR; this provides a convenient battery monitor without enabling battery compensation.
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6.37.3 VP Reference
Sets the desired VP reference used for battery compensation.
VPREF[3:0] Desired VP used to calculate the required attenuation on the speaker output:
(for VA = 1.8 V) 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111
Application:
1.5 V 2.0 V 2.5 V 3.0 V 3.5 V 4.0 V 4.5 V 5.0 V (for VA = 2.5 V) 1.5 V 2.0 V 2.5 V 3.0 V 3.5 V 4.0 V 4.5 V 5.0 V “VP Battery Compensation” on page 33
6.38
VP Battery Level (Address 30h) (Read Only)
6 VPLVL6 5 VPLVL5 4 VPLVL4 3 VPLVL3 2 VPLVL2 1 VPLVL1 0 VPLVL0
7 VPLVL7
6.38.1 VP Voltage Level (Read Only)
Indicates the unsigned VP voltage level.
VPLVL[7:0] VP Voltage
... 0101 1110 ... 0111 0010 ...
Formula:
3.0 V (for VA = 2.0 V); apply formula using actual VA voltage to calculate VP voltage. 3.7 V (for VA = 2.0 V); apply formula using actual VA voltage to calculate VP voltage. VP Voltage = (Binary representation of VPLVL[7:0]) * VA / 63.3
6.39
Speaker Status (Address 31h) (Read Only)
6 Reserved 5 SPKASHRT 4 SPKBSHRT 3 SPKR/HP 2 Reserved 1 TWRN 0 TERR
7 Reserved
6.39.1 Speaker Current Load Status (Read Only)
Indicates whether or not any of the speaker outputs is shorted to ground.
SPKxSHRT Speaker Output Load
0 1
No overload detected Overload detected
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6.39.2 SPKR/HP Pin Status (Read Only)
Indicates the status of the SPKR/HP pin.
SPKR/HP Pin State
0 1
Pulled Low Pulled High
6.39.3 Thermal Warning Status (Read Only)
Indicates whether or not the CODEC’s die temperature is approaching thermal error status.
TWRN Thermal Status
0 1
Die temperature has not approached thermal error status. Die temperature is approaching thermal error status.
6.39.4 Thermal Error Status (Read Only)
Indicates whether or not the CODEC’s die temperature has exceeded safe temperatures.
TERR Thermal Status
0 1
Die temperature is within safe operating limits Die temperature has reached unsafe levels; Speaker outputs will shut down immediately.
6.40
Temperature Monitor Control (Address 32h)
6 Reserved 5 Reserved 4 Reserved 3 Reserved 2 Reserved 1 Reserved 0 Reserved
7 RELEASE
6.40.1 Temperature Acknowledge & Release
User-acknowledge input allowing the speaker output to resume normal operation after an automatic thermal-error-shutdown (“Thermal Error Status (Read Only)” on page 73).
RELEASE User Action
0 1
Remove automatic speaker-shutdown after thermal error is acknowledged Acknowledge thermal error
Note: When temperatures exceed the TERRTHR[2:0] and the speaker outputs power down, this bit must first be toggled from ‘0’b to ‘1’b and then back to ‘0’b before the speaker powers up and resumes normal operation.
6.40.2 Thermal Foldback (Address 33h)
7 Reserved 6 Reserved 5 Reserved 4 Reserved 3 THRFLD 2 SPKATTN2 1 SPKATTN1 0 SPKATTN0
6.40.3 Thermal Foldback
Configures automatic adjustment of the speaker volume when the die temperature is approaching thermal error status.
THRFLD Automatic Speaker Attenuation
0 1
Disabled Enabled
Note: If THRFLD is enabled and subsequently disabled when a thermal warning (indicated by TWRN) is in progress, future automatic attenuation (specified in SPKATTN) is disabled but the current automatic attenuation may remain for as long as ~512 ms before returning to the volume specified in SPKxVOL[7:0]. DS680A1 73
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6.40.4 Speaker Attenuation
Sets the speaker attenuation level when die temperature is approaching thermal error status.
SPKATTN[2:0] Attenuation Setting
000 001 010 011 100 101 110 111
0 dB 1 dB 2 dB 3 dB 4 dB 5 dB 6 dB 7 dB
Note: The output levels of the affected channel returns to the volume specified in SPKxVOL[7:0] (“Speaker Volume Control” on page 64) after ~512 ms.
6.41
Charge Pump Frequency (Address 34h)
6 CHGFREQ2 5 CHGFREQ1 4 CHGFREQ0 3 Reserved 2 Reserved 1 Reserved 0 Reserved
7 CHGFREQ3
6.41.1 Charge Pump Frequency
Sets the charge pump frequency on FLYN and FLYP.
CHGFREQ[3:0] N
0000 ... 0101 ... 1111
Formula:
0 5 15
Frequency = (64xFs)/(N+2)
Note:
The headphone output THD+N performance may be affected.
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CS42L52 7. ANALOG PERFORMANCE PLOTS
7.1 Headphone THD+N versus Output Power Plots
Test conditions (unless otherwise specified): Input test signal is a 997 Hz sine wave; measurement bandwidth is 10 Hz to 20 kHz; Fs = 48 kHz.
-10 -15 -20 -25 -30 -35 -40 -45 -50 -55 -60 -65 -70 -75 -80 -85 -90 -95 -100 0
G = 0.6047
VHP = VA = 1.8 V
G = 0.7099 G = 0.8399 G = 1.0000 G = 1.1430 Legend
d B r A
NOTE: Graph shows the output power per channel (i.e. Output Power = 23 mW into single 16 Ω and 46 mW into stereo 16 Ω with THD+N = 75 dB).
10m
20m
30m
40m W
50m
60m
70m
80m
Figure 22. THD+N vs. Output Power per Channel at 1.8 V (16 Ω load)
-10 -15 -20 -25 -30 -35 -40 -45 -50 -55 -60 -65 -70 -75 -80 -85 -90 -95 -100 0
VHP = VA = 2.5 V
G = 0.6047 G = 0.7099 G = 0.8399 G = 1.0000 G = 1.1430 Legend
d B r A
NOTE: Graph shows the output power per channel (i.e. Output Power = 44 mW into single 16 Ω and 88 mW into stereo 16 Ω with THD+N = 75 dB).
10m
20m
30m
40m W
50m
60m
70m
80m
Figure 23. THD+N vs. Output Power per Channel at 2.5 V (16 Ω load)
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CS42L52
VHP = VA = 1.8 V
-20 -30 -35 -40 -45 -50 -55 d B r A -60 -65 -70 -75 -80 -85 -90 -95
G = 0.6047 G = 0.7099 G = 0.8399 G = 1.0000 G = 1.1430 Legend
NOTE: Graph shows the output power per channel (i.e. Output Power = 22 mW into single 32 Ω and 44 mW into stereo 32 Ω with THD+N = 75 dB).
-100 0
6m
12m
18m
24m
30m W
36m
42m
48m
54m
60m
Figure 24. THD+N vs. Output Power per Channel at 1.8 V (32 Ω load)
-20 -25 -30 -35 -40 -45 -50 -55 d B r A -60 -65 -70 -75 -80 -85 -90 -95
VHP = VA = 2.5 V
G = 0.6047 G = 0.7099 G = 0.8399 G = 1.0000 G = 1.1430 Legend
NOTE: Graph shows the output power per channel (i.e. Output Power = 42 mW into single 32 Ω and 84 mW into stereo 32 Ω with THD+N = 75 dB).
-100 0
5m
10m
15m
20m
25m
30m W
35m
40m
45m
50m
55m
60m
Figure 25. THD+N vs. Output Power per Channel at 2.5 V (32 Ω load)
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CS42L52 8. EXAMPLE SYSTEM CLOCK FREQUENCIES
8.1 Auto Detect Enabled
Sample Rate LRCK (kHz)
8 11.025 12
*The”MCLKDIV2” bit must be enabled.
1024x
8.1920 11.2896 12.2880
MCLK (MHz) 1536x 2048x*
12.2880 16.9344 18.4320 16.3840 22.5792 24.5760
3072x*
24.5760 33.8688 36.8640
Sample Rate LRCK (kHz)
16 22.05 24
512x
8.1920 11.2896 12.2880
MCLK (MHz) 768x 1024x*
12.2880 16.9344 18.4320 16.3840 22.5792 24.5760
1536x*
24.5760 33.8688 36.8640
Sample Rate LRCK (kHz)
32 44.1 48
256x
8.1920 11.2896 12.2880
MCLK (MHz) 384x 512x*
12.2880 16.9344 18.4320 16.3840 22.5792 24.5760
768x*
24.5760 33.8688 36.8640
Sample Rate LRCK (kHz)
64 88.2 96
128x
8.1920 11.2896 12.2880
MCLK (MHz) 192x 256x*
12.2880 16.9344 18.4320 16.3840 22.5792 24.5760
384x*
24.5760 33.8688 36.8640
8.2
Auto Detect Disabled
Sample Rate LRCK (kHz)
8 11.025 12
512x
6.1440
768x
6.1440 8.4672 9.2160
MCLK (MHz) 1024x 1536x
8.1920 11.2896 12.2880 12.2880 16.9344 18.4320
2048x
16.3840 22.5792 24.5760
3072x
24.5760 33.8688 36.8640
Sample Rate LRCK (kHz)
16 22.05 24
256x
6.1440
384x
6.1440 8.4672 9.2160
512x
8.1920 11.2896 12.2880
MCLK (MHz) 768x
12.2880 16.9344 18.4320
1024x
16.3840 22.5792 24.5760
1536x
24.5760 33.8688 36.8640
Sample Rate LRCK (kHz)
32 44.1 48
256x
8.1920 11.2896 12.2880
MCLK (MHz) 384x 512x
12.2880 16.9344 18.4320 16.3840 22.5792 24.5760
768x
24.5760 33.8688 36.8640
Sample Rate LRCK (kHz)
64 88.2 96
128x
8.1920 11.2896 12.2880
MCLK (MHz) 192x 256x
12.2880 16.9344 18.4320 16.3840 22.5792 24.5760
384x
24.5760 33.8688 36.8640
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CS42L52 9. PCB LAYOUT CONSIDERATIONS
9.1 Power Supply, Grounding
As with any high-resolution converter, the CS42L52 requires careful attention to power supply and grounding arrangements if its potential performance is to be realized. Figure 1 on page 10 shows the recommended power arrangements, with VA and VHP connected to clean supplies VD, which powers the digital circuitry, may be run from the system logic supply. Alternatively, VD may be powered from the analog supply via a ferrite bead. In this case, no additional devices should be powered from VD. Extensive use of power and ground planes, ground plane fill in unused areas and surface mount decoupling capacitors are recommended. Decoupling capacitors should be as close to the pins of the CS42L52 as possible. The low value ceramic capacitor should be closest to the pin and should be mounted on the same side of the board as the CS42L52 to minimize inductance effects. All signals, especially clocks, should be kept away from the FILT+ and VQ pins in order to avoid unwanted coupling into the modulators. The FILT+ and VQ decoupling capacitors, particularly the 0.1 µF, must be positioned to minimize the electrical path from FILT+ and AGND. The CDB42L52 evaluation board demonstrates the optimum layout and power supply arrangements.
9.2
QFN Thermal Pad
The CS42L52 is available in a compact QFN package. The underside of the QFN package reveals a large metal pad that serves as a thermal relief to provide for maximum heat dissipation. This pad must mate with an equally dimensioned copper pad on the PCB and must be electrically connected to ground. A series of vias should be used to connect this copper pad to one or more larger ground planes on other PCB layers. In split ground systems, it is recommended that this thermal pad be connected to AGND for best performance. The CS42L52 evaluation board demonstrates the optimum thermal pad and via configuration.
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CS42L52 10.ADC & DAC DIGITAL FILTERS
Figure 26. ADC Passband Ripple
Figure 27. ADC Stopband Rejection
Figure 28. ADC Transition Band
Figure 29. ADC Transition Band Detail
Figure 30. DAC Passband Ripple
Figure 31. DAC Stopband
Figure 32. DAC Transition Band DS680A1
Figure 33. DAC Transition Band (Detail) 79
CS42L52 11.PARAMETER DEFINITIONS
Dynamic Range The ratio of the rms value of the signal to the rms sum of all other spectral components over the specified bandwidth. Dynamic Range is a signal-to-noise ratio measurement over the specified band width made with a -60 dBFS signal. 60 dB is added to resulting measurement to refer the measurement to full-scale. This technique ensures that the distortion components are below the noise level and do not affect the measurement. This measurement technique has been accepted by the Audio Engineering Society, AES17-1991, and the Electronic Industries Association of Japan, EIAJ CP-307. Expressed in decibels. Total Harmonic Distortion + Noise The ratio of the rms value of the signal to the rms sum of all other spectral components over the specified band width (typically 10 Hz to 20 kHz), including distortion components. Expressed in decibels. Measured at -1 and -20 dBFS as suggested in AES17-1991 Annex A. Frequency Response A measure of the amplitude response variation from 10 Hz to 20 kHz relative to the amplitude response at 1 kHz. Units in decibels. Interchannel Isolation A measure of crosstalk between the left and right channel pairs. Measured for each channel at the converter's output with no signal to the input under test and a full-scale signal applied to the other channel. Units in decibels. Interchannel Gain Mismatch The gain difference between left and right channel pairs. Units in decibels. Gain Error The deviation from the nominal full-scale analog output for a full-scale digital input. Gain Drift The change in gain value with temperature. Units in ppm/°C. Offset Error The deviation of the mid-scale transition (111...111 to 000...000) from the ideal. Units in mV.
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DS680A1
CS42L52 12.PACKAGE DIMENSIONS 40L QFN (6 X 6 mm BODY) PACKAGE DRAWING
D
2.00REF
b
e
PIN #1CORNER
2.00REF
PIN #1IDENTIFIER ∅0.50±0.10 LASER MARKING
E
E2
A1 A
L D2
DIM A A1 b D D2 E E2 e L
MIN -0.0000 0.0071 0.1594 0.1594 0.0118
INCHES NOM --0.0091 0.2362 BSC 0.1614 0.2362 BSC 0.1614 0.0197 BSC 0.0157
MAX 0.0394 0.0020 0.0110 0.1634 0.1634 0.0197
MIN -0.00 0.18 4.05 4.05 0.30
MILLIMETERS NOM --0.23 6.00 BSC 4.10 6.00 BSC 4.10 0.50 BSC 0.40
NOTE MAX 1.00 0.05 0.28 4.15 4.15 0.50 1 1 1,2 1 1 1 1 1 1
JEDEC #: MO-220 Controlling Dimension is Millimeters. 1. Dimensioning and tolerance per ASME Y 14.5M-1995. 2. Dimensioning lead width applies to the plated terminal and is measured between 0.20 mm and 0.25 mm from the terminal tip.
THERMAL CHARACTERISTICS
Parameter
Junction to Ambient Thermal Impedance 2 Layer Board 4 Layer Board
Symbol
θJA
Min
-
Typ
44 19
Max
-
Units
°C/Watt
DS680A1
81
CS42L52 13.ORDERING INFORMATION
Product
CS42L52
Description
Low-Power Stereo CODEC w/HP and Speaker Amps for Portable Apps CS42L52 Evaluation Board CS42L52 Reference Design
Package Pb-Free
40L-QFN Yes
Grade
Temp Range
Container
Order #
Commercial -40 to +85° C Automotive -40 to +105° C No No -
Rail CS42L52-CNZ Tape & Reel CS42L52-CNZR Rail CS42L52-DNZ Tape & Reel CS42L52-DNZR CDB42L52 CRD42L52
CDB42L52 CRD42L52
14.REFERENCES
1. Philips Semiconductor, The I²C-Bus Specification: Version 2.1, January 2000. http://www.semiconductors.philips.com
15.REVISION HISTORY
Revision
A1 Initial Release
Changes
Contacting Cirrus Logic Support
For all product questions and inquiries, contact a Cirrus Logic Sales Representative. To find one nearest you, go to www.cirrus.com.
IMPORTANT NOTICE "Advance" product information describes products that are in development and subject to development changes. Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third parties. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives consent for copies to be made of the information only for use within your organization with respect to Cirrus integrated circuits or other products of Cirrus. This consent does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale. CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED FOR USE IN AIRCRAFT SYSTEMS, MILITARY APPLICATIONS, PRODUCTS SURGICALLY IMPLANTED INTO THE BODY, AUTOMOTIVE SAFETY OR SECURITY DEVICES, LIFE SUPPORT PRODUCTS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER’S RISK AND CIRRUS DISCLAIMS AND MAKES NO WARRANTY, EXPRESS, STATUTORY OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE, WITH REGARD TO ANY CIRRUS PRODUCT THAT IS USED IN SUCH A MANNER. IF THE CUSTOMER OR CUSTOMER’S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICATIONS, CUSTOMER AGREES, BY SUCH USE, TO FULLY INDEMNIFY CIRRUS, ITS OFFICERS, DIRECTORS, EMPLOYEES, DISTRIBUTORS AND OTHER AGENTS FROM ANY AND ALL LIABILITY, INCLUDING ATTORNEYS’ FEES AND COSTS, THAT MAY RESULT FROM OR ARISE IN CONNECTION WITH THESE USES. Cirrus Logic, Cirrus, and the Cirrus Logic logo designs are trademarks of Cirrus Logic, Inc. All other brand and product names in this document may be trademarks or service marks of their respective owners. I²C is a registered trademark of Philips Semiconductor.
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