CS42L52

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 25 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 DS680A1 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 34 DS680A1 CS42L52 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 DS680A1 35 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. 36 DS680A1 CS42L52 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. DS680A1 37 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. DS680A1 39 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 40 DS680A1 CS42L52 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 DS680A1 41 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. 42 DS680A1 CS42L52 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 DS680A1 43 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. 44 DS680A1 CS42L52 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 DS680A1 CS42L52 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 CS42L52 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 DS680A1 CS42L52 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 DS680A1 CS42L52 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 CS42L52 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 DS680A1 CS42L52 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 DS680A1 CS42L52 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 CS42L52 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 CS42L52 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 61 CS42L52 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 62 DS680A1 CS42L52 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 DS680A1 63 CS42L52 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 64 DS680A1 CS42L52 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. DS680A1 65 CS42L52 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. 66 DS680A1 CS42L52 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. DS680A1 67 CS42L52 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 68 DS680A1 CS42L52 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 DS680A1 69 CS42L52 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- 70 DS680A1 CS42L52 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. DS680A1 71 CS42L52 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 72 DS680A1 CS42L52 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 CS42L52 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. 74 DS680A1 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) DS680A1 75 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) 76 DS680A1 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 DS680A1 77 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. 78 DS680A1 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. 80 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. 82 DS680A1