CDB42324

CS42324 10-In, 6-Out, 2 Vrms Audio CODEC D/A Features Dual 24-bit Stereo DACs Multi-bit Delta-Sigma Modulator 100 dB Dynamic Range (A-Wtd) -90 dB THD+N Integrated Line Driver – 2 Vrms Output – Single-Ended Outputs Up to 96 kHz Sampling Rates Stereo 7:1 Output Multiplexer Volume Control with Soft Ramp – 0.5 dB Step Size – Zero Crossing Click-Free Transitions Selectable Serial Audio Interface Formats – Left- or Right-Justified, Up to 24-bit – I²S Up to 24-bit Selectable 50/15 μs De-Emphasis Internal Analog Mute Control Output for External Muting Popguard® Technology 1.8 V to 3.3 V 3.3 V A/D Features Multi-bit Delta-Sigma Modulator 24-bit Conversion Up to 96 kHz Sampling Rates 95 dB Dynamic Range (A-Wtd) -88 dB THD+N Stereo 5:1 Input Multiplexer Digital Volume Control with Soft Ramp – 0.5 dB Step Size Selectable Serial Audio Interface Formats – – Left-Justified I²S High-Pass Filter or DC Offset Calibration See System Features, General Description, and Ordering information on page 2. 3.3 V 9 V to12 V PCM Serial Interface Level Translator Volume Control/Mixer Volume Control/Mixer Multibit ΔΣ Modulator Multibit ΔΣ Modulator Stereo DAC 5 7:1 MUX Mute Stereo Output 1 Serial Audio Inputs 7:1 MUX Mute Stereo Output 2 Stereo DAC 5 7:1 MUX Level Translator SPI & I C Control Data Interrupt ADC Overflow Reset 2 Mute Stereo Output 3 5 Register Configuration Internal Voltage Reference Mute Control Mute 1 Mute 2 Mute 3 Stereo Input 1 Stereo Input 2 Stereo Input 3 Stereo Input 4 Stereo Input 5 PCM Serial Interface Level Translator Serial Audio Output Volume Control/High Pass Filter Low-Latency Decimation Filter Multibit Oversampling Stereo ADC 5:1 MUX 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. 2008 (All Rights Reserved) JANUARY '08 DS721A6 CS42324 System Features Direct Interface with 1.8 V to 3.3 V Logic Levels Supports Asynchronous Serial Port Operation – – Two Independent Clock Domains ADC, DAC1, and DAC2 can be Independently Assigned to the Two Clock Domains Each Serial Port Supports Master or Slave Operation General Description The CS42324 is a highly integrated stereo audio CODEC. The CS42324 performs stereo analog-todigital (A/D) and up to four channels of digital-to-analog (D/A) conversion of up to 24-bit serial values at sample rates up to 96 kHz. A 5:1 stereo input multiplexer is included for selecting between line-level inputs. The output of the input multiplexer is followed by an advanced 3rd-order, multi-bit delta-sigma modulator and digital filtering/decimation. Sampled data is transmitted by the serial audio interface at rates from 4 kHz to 96 kHz, in either Slave or Master Mode. The D/A converter is based on a 5th-order multi-bit delta-sigma modulator with an ultra-linear low-pass filter and offers a volume control that operates with a 0.5 dB step size. It incorporates selectable soft ramp and zero crossing transition functions to eliminate clicks and pops. An integrated 7:1 stereo output multiplexer on each of the three stereo 2 Vrms line-level outputs is used to select any of the 5 stereo analog inputs, for analog bypass support, or the outputs of the 2 internal DACs. Each 2 Vrms output can be muted with the selectable analog mute function. Standard 50/15 μs de-emphasis is available for a 44.1 kHz sample rate for compatibility with digital audio programs mastered using the 50/15 μs pre-emphasis technique. Integrated digital level translators allow easy interfacing between the CS42324 and other devices operating over a wide range of logic levels. The CS42324 is available in a 48-pin LQFP package in Commercial (-40°C to +85°C) and Automotive (-40°C to +105°C) grades. The CDB42324 Customer Demonstration board is also available for device evaluation and implementation suggestions. Please refer to “Ordering information” on page 71 for complete details. – Internal Digital Loopback +3.3 V Analog Power Supply +3.3 V Digital Power Supply +9 V to +12 V High-Voltage Power Supply Hardware or Software Mode Configuration – Supports I²C® and SPI™ Software Interface 2 DS721A6 CS42324 TABLE OF CONTENTS 1. PIN DESCRIPTIONS .............................................................................................................................. 8 1.1 Software Mode ................................................................................................................................. 8 1.2 Hardware Mode .............................................................................................................................. 10 1.3 Digital I/O Pin Characteristics ......................................................................................................... 12 2. CHARACTERISTICS AND SPECIFICATIONS .................................................................................... 13 RECOMMENDED OPERATING CONDITIONS ................................................................................... 13 ABSOLUTE MAXIMUM RATINGS ....................................................................................................... 13 DAC ANALOG CHARACTERISTICS - COMMERCIAL (-CQZ) ........................................................... 14 DAC ANALOG CHARACTERISTICS - AUTOMOTIVE (-DQZ) ............................................................ 15 DAC COMBINED INTERPOLATION & ON-CHIP ANALOG FILTER RESPONSE .............................. 16 ADC ANALOG CHARACTERISTICS - COMMERCIAL (-CQZ) ........................................................... 17 ADC ANALOG CHARACTERISTICS - AUTOMOTIVE (-DQZ) ............................................................ 18 ADC DIGITAL FILTER CHARACTERISTICS ....................................................................................... 19 ANALOG PASS-THRU CHARACTERISTICS ...................................................................................... 20 DC ELECTRICAL CHARACTERISTICS .............................................................................................. 21 DIGITAL INTERFACE CHARACTERISTICS ....................................................................................... 21 SWITCHING CHARACTERISTICS - SERIAL AUDIO .......................................................................... 22 SWITCHING CHARACTERISTICS - SERIAL AUDIO (CONT.) ........................................................... 23 SWITCHING CHARACTERISTICS - SOFTWARE MODE - I²C FORMAT ........................................... 24 SWITCHING CHARACTERISTICS - SOFTWARE MODE - SPI FORMAT .......................................... 25 3. TYPICAL CONNECTION DIAGRAMS ................................................................................................. 26 4. APPLICATIONS ................................................................................................................................... 28 4.1 System Clocking ............................................................................................................................. 28 4.1.1 Master Clock ......................................................................................................................... 28 4.1.2 Synchronous / Asynchronous Mode ...................................................................................... 29 4.2 Serial Port Operation ...................................................................................................................... 29 4.2.1 Master Mode ......................................................................................................................... 30 4.2.2 Slave Mode ........................................................................................................................... 30 4.2.3 ADC, DAC1, and DAC2 clock selection ................................................................................ 31 4.2.4 High-Impedance Digital Output ............................................................................................. 31 4.2.5 Digital Interface Formats ....................................................................................................... 32 4.2.6 Synchronization of Multiple Devices ...................................................................................... 32 4.3 Analog-to-Digital Data Path ............................................................................................................ 33 4.3.1 ADC Analog Input Multiplexer ............................................................................................... 33 4.3.2 ADC Description .................................................................................................................... 33 4.3.3 High-Pass Filter and DC Offset Calibration ........................................................................... 34 4.3.4 Digital Attenuation Control ..................................................................................................... 34 4.4 Digital-to-Analog Data Path ............................................................................................................ 34 4.4.1 Digital Volume Control ........................................................................................................... 34 4.4.2 Mono Channel Mixer ............................................................................................................. 34 4.4.3 De-Emphasis Filter ................................................................................................................ 35 4.4.4 Internal Digital Loopback ....................................................................................................... 35 4.4.5 DAC Description .................................................................................................................... 35 4.4.6 Analog Output Multiplexer ..................................................................................................... 36 4.4.7 Output Transient Control ....................................................................................................... 36 4.4.8 Mute Control .......................................................................................................................... 37 4.5 Initialization ..................................................................................................................................... 37 4.5.1 Determining Hardware or Software Mode ............................................................................. 37 4.5.2 Hardware Mode Start-Up ...................................................................................................... 37 4.5.3 Software Mode Start-Up ........................................................................................................ 38 4.5.4 Initialization Flow Chart ......................................................................................................... 39 4.6 Device Control ................................................................................................................................ 40 DS721A6 3 CS42324 4.6.1 Hardware Mode ..................................................................................................................... 40 4.6.2 Software Mode - I²C Control Port .......................................................................................... 41 4.6.3 Software Mode - SPI Control Port ......................................................................................... 42 4.6.4 Memory Address Pointer (MAP) ............................................................................................ 43 4.7 Interrupts and Overflow .................................................................................................................. 43 5. REGISTER QUICK REFERENCE ........................................................................................................ 44 6. REGISTER DESCRIPTION .................................................................................................................. 46 6.1 Device I.D. and Revision Register (Address 00h) (Read Only) ...................................................... 46 6.1.1 Device I.D. (Read Only) ........................................................................................................ 46 6.1.2 Chip Revision (Read Only) .................................................................................................... 46 6.2 Mute Control (Address 01h) ........................................................................................................... 46 6.2.1 System MCLK Source ........................................................................................................... 46 6.2.2 Mute DAC2 Left-Channel ...................................................................................................... 46 6.2.3 Mute DAC2 Right-Channel .................................................................................................... 47 6.2.4 Mute DAC1 Left-Channel ...................................................................................................... 47 6.2.5 Mute DAC1 Right-Channel .................................................................................................... 47 6.2.6 Mute ADC Left-Channel ........................................................................................................ 47 6.2.7 Mute ADC Right-Channel ...................................................................................................... 47 6.3 Operational Control (Address 02h) ................................................................................................. 47 6.3.1 Global Power-Down .............................................................................................................. 47 6.3.2 INT Pin High/Low Active (INT_H/L) ....................................................................................... 48 6.3.3 Freeze ................................................................................................................................... 48 6.3.4 Tri-State SDOUT ................................................................................................................... 48 6.3.5 Tri-State Serial Port 1 ............................................................................................................ 48 6.3.6 Tri-State Serial Port 2 ............................................................................................................ 49 6.4 Serial Port 1 Control (Address 03h) ................................................................................................ 49 6.4.1 Serial Port 1 Master/Slave Select .......................................................................................... 49 6.4.2 Serial Port 1 Speed Mode ..................................................................................................... 49 6.4.3 MCLK1 Divider ...................................................................................................................... 49 6.4.4 Serial Port 1 MCLK source .................................................................................................... 49 6.5 Serial Port 2 Control (Address 04h) ................................................................................................ 50 6.5.1 Serial Port 2 Master/Slave Select .......................................................................................... 50 6.5.2 Serial Port 2 Speed Mode ..................................................................................................... 50 6.5.3 MCLK2 Divider ...................................................................................................................... 50 6.5.4 Serial Port 2 MCLK Source ................................................................................................... 50 6.6 ADC Clocking (Address 06h) .......................................................................................................... 50 6.6.1 ADC MCLK Source ............................................................................................................... 50 6.6.2 ADC Serial Port Source ......................................................................................................... 51 6.6.3 ADC Digital Interface Format (ADC_DIF) .............................................................................. 51 6.7 DAC1 Clocking (Address 07h) ........................................................................................................ 51 6.7.1 DAC1 MCLK Source ............................................................................................................. 51 6.7.2 DAC1 Serial Port Source ....................................................................................................... 51 6.7.3 DAC1 Digital Interface Format (DAC1_DIF) .......................................................................... 51 6.8 DAC2 Clocking (Address 08h) ........................................................................................................ 52 6.8.1 DAC2 MCLK Source ............................................................................................................. 52 6.8.2 DAC2 Serial Port Source ....................................................................................................... 52 6.8.3 DAC2 Digital Interface Format (DAC2_DIF) .......................................................................... 52 6.9 ADC Control (Address 0Ah) ........................................................................................................... 52 6.9.1 ADC High-Pass Filter Freeze ................................................................................................ 52 6.9.2 ADC Soft Ramp Control ........................................................................................................ 52 6.9.3 Analog Input Selection .......................................................................................................... 53 6.10 DAC1 Control (Address 0Bh) ....................................................................................................... 53 6.10.1 DAC1 De-Emphasis Control ................................................................................................ 53 6.10.2 DAC1 Single Volume Control .............................................................................................. 53 4 DS721A6 CS42324 6.10.3 DAC1 Soft Ramp Control .................................................................................................... 53 6.10.4 DAC1 Zero Cross Control ................................................................................................... 54 6.10.5 DAC1 Loop-Back ................................................................................................................. 54 6.10.6 DAC1 Invert Signal Polarity ................................................................................................. 54 6.10.7 DAC1 Channel Mixer ........................................................................................................... 54 6.11 DAC2 Control (Address 0Ch) ....................................................................................................... 55 6.11.1 DAC2 De-Emphasis Control ................................................................................................ 55 6.11.2 DAC2 Single Volume Control .............................................................................................. 55 6.11.3 DAC2 Soft Ramp Control .................................................................................................... 55 6.11.4 DAC2 Zero Cross Control ................................................................................................... 55 6.11.5 DAC2 Loop-Back ................................................................................................................. 56 6.11.6 DAC2 Invert Signal Polarity ................................................................................................. 56 6.11.7 DAC2 Channel Mixer ........................................................................................................... 56 6.12 AOUT1 Control (Address 0Dh) ..................................................................................................... 56 6.12.1 External Mute Control Pin ................................................................................................... 56 6.12.2 AOUT1 Select ..................................................................................................................... 56 6.13 AOUT2 Control (Address 0Eh) ..................................................................................................... 57 6.13.1 External Mute Control Pin ................................................................................................... 57 6.13.2 AOUT2 Select ..................................................................................................................... 57 6.14 AOUT3 Control (Address 0Fh) ..................................................................................................... 57 6.14.1 External Mute Control Pin ................................................................................................... 57 6.14.2 AOUT3 Select ..................................................................................................................... 58 6.15 ADCx Volume Control: ADCA (Address 10h) & ADCB (Address 11h) ......................................... 58 6.16 DAC1x Volume Control: DAC1A (Address 12h) & DAC1B (Address 13h) ................................... 58 6.17 DAC2x Volume Control: DAC1A (Address 14h) & DAC1B (Address 15h) ................................... 59 6.18 Interrupt Mode (Address 16h) ....................................................................................................... 59 6.19 Interrupt Mask (Address 17h) ....................................................................................................... 59 6.19.1 DAC2 Auto Mute Left Mask (DAC2_AMUTELM) ................................................................ 60 6.19.2 DAC2 Auto Mute Right Mask (DAC2_AMUTERM) ............................................................. 60 6.19.3 DAC1 Auto Mute Left Mask (DAC1_AMUTELM) ................................................................ 60 6.19.4 DAC1 Auto Mute Right Mask (DAC1_AMUTELM) .............................................................. 60 6.19.5 Serial Port 2 Clock Error Mask (SP2_CLKERRM) .............................................................. 60 6.19.6 Serial Port 1 Clock Error Mask (SP1_CLKERRM) .............................................................. 60 6.19.7 ADC Positive Overflow Mask (ADC_OVFLPM) ................................................................... 61 6.19.8 ADC Negative Overflow Mask (ADC_OVFLNM) ................................................................. 61 6.20 Interrupt Status (Address 18h) (Read Only) ................................................................................. 61 6.20.1 DAC2 Auto Mute Left Interrupt Status (DAC2_AMUTEL) ................................................... 61 6.20.2 DAC2 Auto Mute Right Interrupt Status (DAC2_AMUTER) ................................................ 61 6.20.3 DAC1 Auto Mute Left Interrupt Status (DAC1_AMUTEL) ................................................... 62 6.20.4 DAC1 Auto Mute Right Interrupt Status (DAC1_AMUTEL) ................................................. 62 6.20.5 Serial Port 2 Clock Error Interrupt Status (SP2_CLKERR) ................................................. 62 6.20.6 Serial Port 1 Clock Error Interrupt Status (SP1_CLKERR) ................................................. 62 6.20.7 ADC Positive Overflow Interrupt Bit (ADC_OVFLP) ............................................................ 62 6.20.8 ADC Negative Overflow Interrupt Bit (ADC_OVFLN) .......................................................... 63 7. GROUNDING AND POWER SUPPLY DECOUPLING ........................................................................ 64 8. ADC FILTER PLOTS ........................................................................................................................... 65 9. DAC DIGITAL FILTER RESPONSE PLOTS ................................................................................ 67 10. PARAMETER DEFINITIONS .............................................................................................................. 69 11. PACKAGE DIMENSIONS ................................................................................................................. 70 THERMAL CHARACTERISTICS AND SPECIFICATIONS ................................................................. 70 12. ORDERING INFORMATION .............................................................................................................. 71 13. REVISION HISTORY .......................................................................................................................... 71 DS721A6 5 CS42324 LIST OF FIGURES Figure 1.Equivalent Analog Output Load .................................................................................................. 16 Figure 2.Maximum Analog Output Loading ............................................................................................... 16 Figure 3.Serial Input Timing ...................................................................................................................... 22 Figure 4.Serial Output Timing ................................................................................................................... 23 Figure 5.Software Mode Timing - I²C Format ............................................................................................ 24 Figure 6.Software Mode Timing - SPI Mode ............................................................................................. 25 Figure 7.Typical Connection Diagram - Software Mode ........................................................................... 26 Figure 8.Typical Connection Diagram - Hardware Mode .......................................................................... 27 Figure 9.Serial Port Topology ................................................................................................................... 29 Figure 10.Master Mode Clock Generation ................................................................................................ 30 Figure 11.Converter Clocking ................................................................................................................... 31 Figure 12.Tri-State Serial Port .................................................................................................................. 31 Figure 13.Left-Justified up to 24-Bit Data .................................................................................................. 32 Figure 14.I²S up to 24-Bit Data ................................................................................................................. 32 Figure 15.Right-Justified 16-Bit Data, Right-Justified 24-Bit Data ............................................................ 32 Figure 16.Analog Input Architecture .......................................................................................................... 33 Figure 17.De-Emphasis Curve .................................................................................................................. 35 Figure 18.Analog Output Architecture ....................................................................................................... 36 Figure 19.Initialization Flow Chart ............................................................................................................. 39 Figure 20.Software Mode Timing, I²C Write .............................................................................................. 41 Figure 21.Software Mode Timing, I²C Read .............................................................................................. 41 Figure 22.Software Mode Timing, SPI Mode ............................................................................................ 43 Figure 23.Single-Speed Mode Stopband Rejection .................................................................................. 65 Figure 24.Single-Speed Mode Transition Band ........................................................................................ 65 Figure 25.Single-Speed Mode Transition Band (Detail) ............................................................................ 65 Figure 26.Single-Speed Mode Passband Ripple ...................................................................................... 65 Figure 27.Double-Speed Mode Stopband Rejection ................................................................................. 65 Figure 28.Double-Speed Mode Transition Band ....................................................................................... 65 Figure 29.Double-Speed Mode Transition Band (Detail) .......................................................................... 66 Figure 30.Double-Speed Mode Passband Ripple ..................................................................................... 66 Figure 31.Single-Speed Stopband Rejection ............................................................................................ 67 Figure 32.Single-Speed Transition Band .................................................................................................. 67 Figure 33.Single-Speed Transition Band (detail) ...................................................................................... 67 Figure 34.Single-Speed Passband Ripple ................................................................................................ 67 Figure 35.Double-Speed Stopband Rejection ........................................................................................... 67 Figure 36.Double-Speed Transition Band ................................................................................................. 67 Figure 37.Double-Speed Transition Band (detail) ..................................................................................... 68 Figure 38.Double-Speed Passband Ripple ............................................................................................... 68 Figure 39.Quad-Speed Stopband Rejection ............................................................................................. 68 Figure 40.Quad-Speed Transition Band ................................................................................................... 68 Figure 41.Quad-Speed Transition Band (detail) ....................................................................................... 68 Figure 42.Quad-Speed Passband Ripple ................................................................................................. 68 LIST OF TABLES Table 1. I/O Power Rails ........................................................................................................................... 12 Table 2. Speed Modes .............................................................................................................................. 28 Table 3. Single-Speed Mode Common Clock Frequencies ...................................................................... 28 Table 4. Double-Speed Mode Common Clock Frequencies ..................................................................... 28 Table 5. M1 and M0 Mode Pins in Hardware Mode .................................................................................. 29 Table 6. Slave Mode SCLK/LRCK Ratios ................................................................................................. 30 Table 7. MCLKx to LRCKx Ratios ............................................................................................................. 30 Table 8. Hardware Mode Interface Format Control ................................................................................... 32 6 DS721A6 CS42324 Table 9. Hardware Mode Feature Summary ............................................................................................. 40 Table 10. Freeze-able Bits ........................................................................................................................ 48 DS721A6 7 CS42324 1. PIN DESCRIPTIONS 1.1 Software Mode SDOUT MCLK1 LRCK1 SCLK2 MCLK2 SCLK1 LRCK2 SDIN1 38 GND 48 47 46 45 44 43 42 41 40 39 SDIN2 37 36 35 34 33 32 VD VL SDA/CDOUT SCL/CCLK AD0/CS AD1/CDIN INT FILT+ VCMADC GND VA VBIAS MUTEC1 MUTEC2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 OVFL RST AIN1A AIN1B AIN2A AIN2B AIN3A AIN3B AIN4A AIN4B AIN5A AIN5B CS42324 31 30 29 28 27 26 25 GNDH VA_H VA_H AOUT1A AOUT1B VCMBUF VCMDAC MUTEC3 AOUT2A AOUT2B AOUT3A Pin Name SDA/CDOUT # 1 Pin Description I²C Format SDA (Input/Output) - Acts as an input/output data pin. An external pull-up resistor is required for I²C control port operation. SPI Format CDOUT (Output) - Acts as an output only data pin. I²C Format, SCL (Input) – Serial clock for the serial control port. An external pull-up resistor is required for I²C control port operation. SPI Format, CCLK (Input) – Serial clock for the serial control port. I²C Format, AD0 (Input) - Forms the device address input AD[0]. SPI Format, CS (Input) - Acts as the active low chip select input. I²C Format, AD1 (Input) - Forms the device address input AD[1]. SPI Format, CDIN (Input) - Becomes the input data pin. Interrupt (Output) - Indicates an interrupt condition has occurred. FILT+ (Output) - Full-scale reference voltage for ADC. ADC Common-Mode Voltage (Output) - Filter connections for the ADC internal quiescent reference voltage. Analog Ground (Input) - Analog ground reference. Analog Power (Input) - Positive power for the internal analog section. Bias Voltage (Output) - Positive reference voltage for the internal DAC. Mute Control 1 (Output) - Active-low mute output can drive external circuitry to eliminate the clicks and pops associated with any single-rail output. This pin will become a high-impedance output during power-down mode or when an invalid MCLK to LRCK ratio is detected. SCL/CCLK AD0/CS AD1/CDIN INT FILT+ VCMADC GND VA VBIAS MUTEC1 2 3 4 5 6 7 8 9 10 11 8 AOUT3B DS721A6 CS42324 MUTEC2 12 Mute Control 2 (Output) - Active-low mute output can drive external circuitry to eliminate the clicks and pops associated with any single-rail output. This pin will become a high-impedance output during power-down mode or when an invalid MCLK to LRCK ratio is detected. Mute Control 3 (Output) - Active-low mute output can drive external circuitry to eliminate the clicks and pops associated with any single-rail output. This pin will become a high-impedance output during power-down mode or when an invalid MCLK to LRCK ratio is detected. VCMBUF (Output) - Internally buffered VCMDAC DAC Common-Mode Voltage (Output) - Filter connections for the DAC internal quiescent reference voltage. Analog High Voltage Power (Input) - Positive power for the internal output buffer section. Analog Ground (Input) - Ground reference for high-voltage section. MUTEC3 VCMBUF VCMDAC VA_H GNDH 13 14 15 16 18 17 AOUT1A, AOUT1B 19, 20 DAC Analog Audio Outputs (Output) - The full-scale output level is specified in the DAC Analog AOUT2A, AOUT2B 21, 22 Characteristics specification table. AOUT3A, AOUT3B 23, 24 AIN5B, AIN5A AIN4B, AIN4A AIN3B, AIN3A AIN2B, AIN2A AIN1B, AIN1A RST OVFL SDIN2 SDIN1 MCLK2 LRCK2 SCLK2 VD GND VL SDOUT SCLK1 LRCK1 MCLK1 25, 26 27, 28 Stereo Analog Inputs 1-5 (Input) - The full-scale input level is specified in the ADC Analog Char29, 30 acteristics specification table. 31, 32 33, 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 Reset (Input) - The device enters a low-power mode when this pin is driven low. ADC Overflow (Output) - Indicates an ADC overflow condition is present. Serial Audio Data Input (Input) - Input for two’s complement serial audio data. Master Clock 2 (Input) - Optional asynchronous clock source for the DAC’s delta-sigma modulators. Serial Port 2 Left/Right Clock (Input/Output) - Determines which channel, Left or Right, is currently active on the serial audio input data line. Serial Port 2 Serial Bit Clock (Input/Output) - Serial bit clock for serial audio interface 2. Digital Power (Input) - Positive power for the internal digital section. Digital Ground (Input) - Ground reference for the internal digital section. Digital Interface Power (Input) - Determines the required signal level for the control and serial port interfaces as shown in “I/O Power Rails” on page 12. Refer to the“Recommended Operating Conditions” on page 13 for appropriate voltages. Serial Audio Data Output (Output) - Output for two’s complement serial audio data. Serial Port 1 Serial Bit Clock (Input/Output) - Serial bit clock for serial audio interface 1. Serial Port 1 Left/Right Clock (Input/Output) - Determines which channel, Left or Right, is currently active on the serial audio output data line. Master Clock 1 (Input) - Clock source for the ADC’s delta-sigma modulators. By default, this signal also clocks the DAC’s delta-sigma modulators. DS721A6 9 CS42324 1.2 Hardware Mode SDOUT MCLK1 LRCK1 SCLK2 MCLK2 SCLK1 LRCK2 48 47 46 45 44 43 42 41 40 39 38 SDIN1 GND SDIN2 37 36 35 34 33 32 VD VL M0 M1 MDIV MUTE DIF FILT+ VCMADC GND VA VBIAS MUTEC1 MUTEC2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 OVFL RST AIN1A AIN1B AIN2A AIN2B AIN3A AIN3B AIN4A AIN4B AIN5A AIN5B CS42324 31 30 29 28 27 26 25 GNDH VA_H VA_H AOUT1A AOUT1B VCMBUF VCMDAC MUTEC3 AOUT2A AOUT2B AOUT3A Pin Name M0, M1 MDIV MUTE DIF FILT+ VCMADC GND VA VBIAS MUTEC1 # 1, 2 3 4 5 6 7 8 9 10 11 Pin Description Mode Selection (Input) - Determines the operational mode of the device. MCLK Divider (Input) - Setting this pin high places a divide-by-2 circuit in the MCLK path to the core device circuitry. MUTE (Input) - Engages the internal digital mute and activates the MUTECx pins DIF (Input) - Sets the serial audio interface format. Setting DIF high selects I²S audio format and low selects LJ audio format. FILT+ (Output) - Full-scale reference voltage for ADC. ADC Common-Mode Voltage (Output) - Filter connections for the ADC internal quiescent reference voltage. Analog Ground (Input) - Analog ground reference. Analog Power (Input) - Positive power for the internal analog section. Bias Voltage (Output) - Positive reference voltage for the internal DAC. Mute Control 1 (Output) - Active-low mute output can drive external circuitry to eliminate the clicks and pops associated with any single-rail output. This pin will become a high-impedance output during power-down mode or when an invalid MCLK to LRCK ratio is detected. Mute Control 2 (Output) - Active-low mute output can drive external circuitry to eliminate the clicks and pops associated with any single-rail output. This pin will become a high-impedance output during power-down mode or when an invalid MCLK to LRCK ratio is detected. MUTEC2 12 10 AOUT3B DS721A6 CS42324 MUTEC3 13 Mute Control 3 (Output) - Active-low mute output can drive external circuitry to eliminate the clicks and pops associated with any single-rail output. This pin will become a high-impedance output during power-down mode or when an invalid MCLK to LRCK ratio is detected. VCMBUF (Output) - Internally buffered VCMDAC DAC Common-Mode Voltage (Output) - Filter connections for the DAC internal quiescent reference voltage. VCMBUF VCMDAC VA_H GNDH 14 15 16, 18 Analog High Voltage Power (Input) - Positive power for the internal output buffer section. 17 Analog Ground (Input) - Ground reference for high-voltage section. AOUT1A, AOUT1B 19, 20 DAC Analog Audio Outputs (Output) - The full-scale output level is specified in the DAC Analog AOUT2A, AOUT2B 21, 22 Characteristics specification table. AOUT3A, AOUT3B 23, 24 AIN5B, AIN5A AIN4B, AIN4A AIN3B, AIN3A AIN2B, AIN2A AIN1B, AIN1A RST OVFL SDIN2 SDIN1 MCLK2 LRCK2 SCLK2 VD GND VL SDOUT SCLK1 LRCK1 MCLK1 25, 26 Stereo Analog Inputs 1-5 (Input) - The full-scale input level is specified in the ADC Analog Char27, 28 acteristics specification table. 29, 30 31, 32 33, 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 Reset (Input) - The device enters a low-power mode when this pin is driven low. ADC Overflow (Output) - Indicates an ADC overflow condition is present. Serial Audio Data Input (Input) - Input for two’s complement serial audio data. Master Clock 2 (Input) - Optional asynchronous clock source for the DAC’s delta-sigma modulators. Serial Port 2 Left/Right Clock (Input/Output) - Determines which channel, Left or Right, is currently active on the serial audio input data line. Serial Port 2 Serial Bit Clock (Input/Output) - Serial bit clock for serial audio interface 2. Digital Power (Input) - Positive power for the internal digital section. Digital Ground (Input) - Ground reference for the internal digital section. Digital Interface Power (Input) - Determines the required signal level for the control and serial port interfaces as shown in “I/O Power Rails” on page 12. Refer to the“Recommended Operating Conditions” on page 13 for appropriate voltages Serial Audio Data Output (Output) - Output for two’s complement serial audio data. Serial Port 1 Serial Bit Clock (Input/Output) - Serial bit clock for serial audio interface 1. Serial Port 1 Left Right/Clock (Input/Output) - Determines which channel, Left or Right, is currently active on the serial audio output data line. Master Clock 1 (Input) - Clock source for the ADC’s delta-sigma modulators. By default, this signal also clocks the DAC’s delta-sigma modulators. DS721A6 11 CS42324 1.3 Digital I/O Pin Characteristics The logic level for each input should adhere to the corresponding power rail and should not exceed the maximum ratings. Power Supply Pin Number 1 2 Pin Name I/O Driver Receiver Software Mode SDA CDOUT SCL CCLK AD0 CS AD1 CDIN INT M0 M1 MDIV MUTE DIF RST LRCK1 LRCK2 SCLK1 SCLK2 MCLK1 MCLK2 SDIN1 SDIN2 SDOUT OVFL MUTEC1 MUTEC2 MUTEC3 Input/Output Hi-Z/Output Input Input Input Output Input Input Input Input Input Input Input/Output Input/Output Input Input Output Output Output 1.8 V - 3.3 V, Open Drain 1.8 V - 3.3 V, CMOS 1.8 V - 3.3 V, Open Drain 1.8 V - 3.3 V, CMOS 1.8 V - 3.3 V, CMOS 1.8 V - 3.3 V, CMOS 1.8 V - 3.3 V, Open Drain 9.0 V - 12.0 V 1.8 V - 3.3 V, with Hysteresis 1.8 V - 3.3 V, with Hysteresis 1.8 V - 3.3 V, with Hysteresis 1.8 V - 3.3 V, with Hysteresis 1.8 V - 3.3 V, with Hysteresis 1.8 V - 3.3 V, with Hysteresis 1.8 V - 3.3 V, with Hysteresis 1.8 V - 3.3 V, with Hysteresis 1.8 V - 3.3 V, with Hysteresis 1.8 V - 3.3 V, with Hysteresis 1.8 V - 3.3 V 1.8 V - 3.3 V 1.8 V - 3.3 V 1.8 V - 3.3 V 1.8 V - 3.3 V - VL 3 4 5 Hardware Mode 1 2 VL 3 4 5 All Modes 35 47 40 46 41 VL 48 39 38 37 45 36 VA_H 11 12 13 Table 1. I/O Power Rails 12 DS721A6 CS42324 2. CHARACTERISTICS AND SPECIFICATIONS RECOMMENDED OPERATING CONDITIONS GND = GNDH = 0 V; All voltages with respect to ground. Parameters Analog Digital Logic High Voltage Analog Ambient Operating Temperature (Power Applied) Commercial(-CQZ) Automotive(-DQZ) DC Power Supplies: Symbol VA VD VL VA_H TA Min 3.13 3.13 1.71 8.55 -40 -40 Nom 3.3 3.3 3.3 9.0 Max 3.47 3.47 3.47 12.60 +85 +105 Units V V V V °C °C ABSOLUTE MAXIMUM RATINGS GND = GNDH = 0 V; All voltages with respect to ground. (Note 1) Parameter DC Power Supplies: Analog Digital Logic High Voltage Analog (Note 2) Logic Symbol VA VD VL VA_H Iin VINA VIND TA Tstg Min -0.3 -0.3 -0.3 -0.3 -10 GND - 0.3 -0.3 -55 -65 Max +4.50 +4.50 +4.50 +17.0 +10 VA_H + 0.3 VL + 0.4 +125 +150 Units V V V V mA V V °C °C Input Current Analog Input Voltage Digital Input Voltage Ambient Operating Temperature (Power Applied) Storage Temperature Notes: 1. Operation beyond these limits may result in permanent damage to the device. Normal operation is not guaranteed at these extremes. 2. Any pin except supplies. Transient currents of up to ±100 mA on the analog input pins will not cause SCR latch-up. DS721A6 13 CS42324 DAC ANALOG CHARACTERISTICS - COMMERCIAL (-CQZ) Test Conditions (unless otherwise specified): VA = VD = VL = 3.3 V, VA_H = 9 V, GND = GNDH = 0 V; TA = 25° C; 997 Hz Full-Scale Output Sine Wave. Decoupling capacitors, Filter capacitors, and Recommended output filter as shown in Figure 7 on page 26 and Figure 8 on page 27; Fs = 48 kHz or 96 kHz; Synchronous Mode; Measurement Bandwidth 10 Hz to 20 kHz, Parameter Dynamic Range 18 to 24-Bit 16-Bit Total Harmonic Distortion + Noise 18 to 24-Bit (Note 3) A-weighted unweighted A-weighted unweighted (Note 3) 0 dB -20 dB -60 dB THD+N 0 dB -20 dB -60 dB (1 kHz) Symbol Min 94 91 88 85 1.9 IOUT (Note 4) (Note 4) RL CL ZOUT 5 Typ 100 97 93 90 -90 -77 -37 -87 -77 -37 -100 0.1 100 2.0 575 50 Max -84 -73 -33 -82 -62 -22 0.25 2.1 100 Unit dB dB dB dB dB dB dB dB dB dB dB dB ppm/°C Vrms μA kΩ pF Ω 16-Bit Interchannel Isolation DC Accuracy Interchannel Gain Mismatch Gain Drift Analog Output Full-Scale Output Voltage Max current draw from an AOUT pin AC-Load Resistance Load Capacitance Output Impedance Notes: 3. One-half LSB of triangular PDF dither added to data. 4. See Figures 1 and 2 on page 16. RL and CL reflect the minimum resistance and maximum capacitance allowed in order to maintain stability in the internal op-amp. CL affects the dominant pole of the internal output amp; increasing CL beyond 100 pF can cause the internal op-amp to become unstable. 14 DS721A6 CS42324 DAC ANALOG CHARACTERISTICS - AUTOMOTIVE (-DQZ) Test Conditions (unless otherwise specified): VA = 3.13 V to 3.47 V, VD = 3.13 V to 3.47 V, VL = 1.71 V to 3.47 V, VA_H = 8.55 V to 12.60 V, GND = GNDH = 0 V; TA = -40° C to +85° C; 997 Hz Full-Scale Output Sine Wave. Decoupling capacitors, filter capacitors, and recommended output filter as shown in Figure 7 on page 26 and Figure 8 on page 27; Fs = 48 kHz or 96 kHz; Synchronous Mode; Measurement Bandwidth 10 Hz to 20 kHz, Parameter Dynamic Range 18 to 24-Bit 16-Bit Total Harmonic Distortion + Noise 18 to 24-Bit (Note 3) A-weighted unweighted A-weighted unweighted (Note 3) 0 dB -20 dB -60 dB THD+N 0 dB -20 dB -60 dB (1 kHz) Symbol Min 90 87 83 80 1.9 IOUT (Note 4) (Note 4) RL CL ZOUT 5 Typ 100 97 93 90 -90 -77 -37 -87 -77 -37 -100 0.1 100 2.0 575 50 Max -80 -67 -27 -77 -67 -27 0.25 2.1 100 Unit dB dB dB dB dB dB dB dB dB dB dB dB ppm/°C Vrms μA kΩ pF Ω 16-Bit Interchannel Isolation DC Accuracy Interchannel Gain Mismatch Gain Drift Analog Output Full-Scale Output Voltage Max current draw from an AOUT pin AC-Load Resistance Load Capacitance Output Impedance DS721A6 15 CS42324 DAC COMBINED INTERPOLATION & ON-CHIP ANALOG FILTER RESPONSE Parameter (Note 5) Single-Speed Mode Passband (Note 6) Frequency Response (10 Hz to 20 kHz) StopBand StopBand Attenuation Group Delay De-emphasis Error (Note 7) Double-Speed Mode Passband (Note 6) Frequency Response (10 Hz to 20 kHz) StopBand StopBand Attenuation Group Delay (Note 6) tgd to -0.01 dB corner to -3 dB corner 0 0 -0.01 .583 80 4.6/Fs .43 .499 +0.01 Fs Fs dB Fs dB s Fs = 44.1 kHz (Note 6) tgd to -0.01 dB corner to -3 dB corner 0 0 -0.01 0.547 102 9.4/Fs .454 .499 +0.01 +/-0.14 Fs Fs dB Fs dB s dB Symbol Min Typ Max Unit Notes: 5. Response is clock-dependent and will scale with Fs. Note that the amplitude vs. frequency plots of this data (Figures 31 to 42) have been normalized to Fs and can be de-normalized by multiplying the X-axis scale by Fs. 6. For Single-Speed Mode, the measurement bandwidth is from StopBand to 3 Fs. For Double-Speed Mode, the measurement bandwidth is from StopBand to 3 Fs. 7. De-emphasis is available only in Single-Speed Mode. 125 3.3 µF Capacitive Load -- C L (pF) AOUTx R L C L V out 100 75 50 25 10 Safe Operating Region GND 2.5 5 10 15 20 Resistive Load -- RL (kΩ) Figure 1. Equivalent Analog Output Load Figure 2. Maximum Analog Output Loading 16 DS721A6 CS42324 ADC ANALOG CHARACTERISTICS - COMMERCIAL (-CQZ) Test Conditions (unless otherwise specified): VA = VD = VL = 3.3 V, VA_H = 9 V, GND = GNDH = 0 V; TA = 25° C; 997 Hz Input Sine Wave. Decoupling capacitors, filter capacitors, and recommended input filter as shown in Figure 7 on page 26 and Figure 8 on page 27; Fs = 48 kHz or 96 kHz; Synchronous Mode; Measurement Bandwidth 10 Hz to 20 kHz, Parameter Single-Speed Mode Dynamic Range Total Harmonic Distortion + Noise A-weighted unweighted (Note 8) -1 dB -20 dB -60 dB A-weighted unweighted (Note 8) -1 dB -20 dB -60 dB Symbol Min 89 86 THD+N 89 86 THD+N -5 0.576•VA Typ 95 92 -88 -72 -32 95 92 -88 -72 -32 0.1 ±100 0.606•VA 200 2 -90 Max -80 -80 +5 0.636•VA Unit dB dB dB dB dB dB dB dB dB dB dB % ppm/°C Vrms kΩ % dB Double-Speed Mode Dynamic Range Total Harmonic Distortion + Noise DC Accuracy Interchannel Gain Mismatch Gain Error Gain Drift Analog Input Characteristics Full-scale Input Voltage Input Impedance Maximum Interchannel Input Impedance Mismatch Interchannel Isolation (1 kHz) Note: 8. Referred to the typical line-level full-scale input voltage. DS721A6 17 CS42324 ADC ANALOG CHARACTERISTICS - AUTOMOTIVE (-DQZ) Test Conditions (unless otherwise specified): VA = 3.13 V to 3.47 V, VD = 3.13 V to 3.47 V, VL = 1.71 V to 3.47 V, VA_H = 8.55 V to 12.60 V, GND = GNDH = 0 V; TA = -40° C to +85° C; 997 Hz Input Sine Wave. Decoupling capacitors, filter capacitors, and recommended input filter as shown in Figure 7 on page 26 and Figure 8 on page 27; Fs = 48 kHz or 96 kHz; Synchronous Mode; Measurement Bandwidth 10 Hz to 20 kHz, Parameter Single-Speed Mode Dynamic Range Total Harmonic Distortion + Noise A-weighted unweighted (Note 8) -1 dB -20 dB -60 dB A-weighted unweighted (Note 8) -1 dB -20 dB -60 dB Symbol Min 85 82 THD+N 85 82 THD+N -5 0.576•VA Typ 95 92 -88 -72 -32 95 92 -88 -72 -32 0.1 ±100 0.606•VA 200 2 -90 Max -78 -78 +5 0.636•VA Unit dB dB dB dB dB dB dB dB dB dB dB % ppm/°C Vrms kΩ % dB Double-Speed Mode Dynamic Range Total Harmonic Distortion + Noise DC Accuracy Interchannel Gain Mismatch Gain Error Gain Drift Analog Input Characteristics Full-scale Input Voltage Input Impedance Maximum Interchannel Input Impedance Mismatch Interchannel Isolation (1 kHz) Note: 9. Referred to the typical line-level full-scale input voltage. 18 DS721A6 CS42324 ADC DIGITAL FILTER CHARACTERISTICS Parameter (Note 10) Single-Speed Mode Passband Passband Ripple Stopband Stopband Attenuation Total Group Delay Double-Speed Mode Passband Passband Ripple Stopband Stopband Attenuation Total Group Delay High-Pass Filter Characteristics Frequency Response Phase Deviation Passband Ripple Filter Settling Time -3.0 dB -0.13 dB @ 20 Hz (Note 11) (Note 11) 1 20 10 105/Fs 0 Hz Hz Deg dB s tgd (-0.1 dB) 0 0.5604 69 9/Fs 0.489 0.025 Fs dB Fs dB s tgd (-0.1 dB) 0 0.569 70 12/Fs 0.489 0.035 Fs dB Fs dB s Symbol Min Typ Max Unit Notes: 10. Response is clock dependent and will scale with sample rate (Fs). Note that the response plots (Figures 23 to 30) are normalized to Fs and can be de-normalized by multiplying the X-axis scale by Fs. 11. Response shown is for Fs = 48 kHz. DS721A6 19 CS42324 ANALOG PASS-THRU CHARACTERISTICS Test Conditions (unless otherwise specified): VA = VD = VL = 3.3 V; VA_H = 9 V; GND = GNDH = 0 V; TA = 25° C; Input test signal is a 1 kHz sine wave; Measurement Bandwidth is 10 Hz to 20 kHz; Synchronous Mode. Parameter Symbol Analog Input to Analog Output Characteristics (Gain=0dB) Dynamic Range A-weighted unweighted Total Harmonic Distortion + Noise (Note 8) 0 dB THD+N -3 dB Frequency Response 10 Hz to 20 kHz Analog Characteristics Max Input Voltage Max Output Voltage Max current draw from an AOUT pin IOUT AC-Load Resistance (Note 4) RL Load Capacitance (Note 4) CL Output Impedance ZOUT Interchannel Isolation (1 kHz) Min Typ Max Unit 89 86 5 - 95 92 -87 -93 ±0.1 2.0 2.0 575 50 -90 -81 100 - dB dB dB dB dB Vrms Vrms μA kΩ pF Ω dB Note: 12. Referred to the typical line-level full-scale input voltage. 20 DS721A6 CS42324 DC ELECTRICAL CHARACTERISTICS GND = GNDH = 0 V; all voltages with respect to ground. MCLK1=12.288 MHz; MCLK2=static; Fs=48 kHz; Master Mode. Parameter Power Supply Current (Normal Operation) VA_H = 9 V VA = 3.3 V VD = 3.3 V VL = 3.3 V VA _H= 9 V VL=VD=VA=3.3 V VA_H = 9 V VL=VD=VA = 3.3 V All supplies (Note 14) Symbol IA_H IA ID IL IPD PSRR VCMADC VCMDAC (Note 15) ICM ZCM FILT+ VBIAS Min Typ 24 19 22 10 0 200 216 169 0.7 60 0.5•VA 4 23 VA VA-0.8 Max 32 25 29 13 289 225 1 Unit mA mA mA mA μA μA mW mW mW dB V V μA kΩ V V Power Supply Current (Power-Down Mode) (Note 13) Power Consumption (Normal Operation) (Power-Down Mode) Power Supply Rejection Ratio (1 kHz) Reference Voltages VCMADC Nominal Voltage VCMDAC Nominal Voltage DC Current from VCMADC or VCMDAC VCMADC or VCMDAC Output Impedance FILT+ Nominal Voltage VBIAS Nominal Voltage Notes: 13. Power-Down Mode is defined as RST = Low, with all clock and data lines held static low and no analog input. 14. Valid with the recommended capacitor values on FILT+, VCMDAC, VCMADC and VCMBUF as shown in Figure 7 on page 26 and Figure 8 on page 27. 15. The DC current draw represents the allowed current draw due to typical leakage through the electrolytic de-coupling capacitors. DIGITAL INTERFACE CHARACTERISTICS Parameters (Note 16) Symbol High-Level Input Voltage VIH Low-Level Input Voltage VIL Digital Interface VOH High-Level Output Voltage at Io=2 mA VOH MUTEC1/MUTEC2/MUTEC3 Digital Interface VOL Low-Level Output Voltage at Io=2 mA VOL MUTEC1/MUTEC2/MUTEC3 Input Leakage Current Iin Input Capacitance Maximum MUTEC1/MUTEC2/MUTEC3 Drive Current Minimum OVFL Active Time Min 0.7•VL VL-1.0 VA_H-1.0 -10 10 -------------------LRC KX 6 Typ 3 Max 0.2•VL 0.4 0.4 +10 1 - Units V V V V V V μA pF mA μs Note: 16. Digital Interface signals include all pins sourced from the VL supply as shown in “I/O Power Rails” on page 12. DS721A6 21 CS42324 SWITCHING CHARACTERISTICS - SERIAL AUDIO Logic ‘0’ = GND = GNDH = 0 V; Logic ‘1’ = VL; CL = 20 pF. Parameter Master Clock (MCLKx = MCLK1, MCLK2) MCLKx Frequency MCLKx Duty Cycle Sample Rates Single-Speed Mode Double-Speed Mode Master Mode SCLKx Frequency SCLKx Period SCLKx Duty Cycle (Note 17) LRCKx setup LRCKx hold SDOUT setup SDOUT hold Slave Mode SCLKx Frequency (Note 18) SCLKx Period SCLKx Duty Cycle LRCKx setup LRCKx hold SDOUT setup SDOUT hold 1/(128•108 kHz) before SCLK rising after SCLK rising before SCLK rising after SCLK rising tPERIOD tHIGH ÷ tPERIOD tSETUP1 tHOLD1 tSETUP2 tHOLD2 72.3 40 20 20 10 10 64•Fs 50 60 Hz ns % ns ns 1/(128*108 kHz) before SCLK rising after SCLK rising before SCLK rising after SCLK rising tPERIOD tHIGH ÷ tPERIOD tSETUP1 tHOLD1 tSETUP2 tHOLD2 64•Fs 72.3 40 20 20 10 10 50 64•Fs 60 Hz ns % ns ns 4 50 54 108 kHz 1.024 40 50 41.4720 60 MHz % Symbol Min Typ Max Unit Notes: 17. Duty cycle of generated SCLKx in Master Mode depends on duty cycle of the corresponding MCLKx as specified under “System Clocking” on page 28. 18. In Slave Mode, the SCLK/LRCK ratio can be set according to preference. However, specified performance is guaranteed only when using the ratios in Section 4.2.1 Master Mode on page 30 and Section 4.2.2 Slave Mode on page 30. tPERIOD SCLKx tHOLD1 LRCKx channel tSETUP1 channel tSETUP2 SDOUT data data tHOLD2 tHIGH Figure 3. Serial Input Timing 22 DS721A6 CS42324 SWITCHING CHARACTERISTICS - SERIAL AUDIO (CONT.) Logic ‘0’ = GND = GNDH = 0 V; Logic ‘1’ = VL; CL = 20 pF. Parameter Master Mode SDINx setup SDINx hold Slave Mode SDINx setup SDINx hold before SCLK rising after SCLK rising tSETUP3 tHOLD3 10 10 ns before SCLK rising after SCLK rising tSETUP3 tHOLD3 10 10 ns Symbol Min Typ Max Unit tPERIOD SCLKx tHOLD1 LRCKx channel tSETUP1 channel tSETUP3 SDINx data data Figure 4. Serial Output Timing tHIGH tHOLD3 DS721A6 23 CS42324 SWITCHING CHARACTERISTICS - SOFTWARE MODE - I²C FORMAT Inputs: Logic ‘0’ = GND = GNDH = 0 V, Logic ‘1’ = VL, CL = 30 pF) Parameter SCL Clock Frequency RST 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 (Note Note:) 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: 19. 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 t t sud t sust low hdd Figure 5. Software Mode Timing - I²C Format tr 24 DS721A6 CS42324 SWITCHING CHARACTERISTICS - SOFTWARE MODE - SPI FORMAT Inputs: Logic ‘0’ = GND = GNDH = 0 V; Logic ‘1’ = VLC; CL = 20 pF. Parameter CCLK Clock Frequency RST Rising Edge to CS Falling CCLK Edge to CS Falling (Note 20) CS High Time Between Transmissions CS Falling to CCLK Edge CCLK Low Time CCLK High Time CDIN to CCLK Rising Setup Time CCLK Rising to DATA Hold Time (Note 21) Rise Time of CCLK and CDIN (Note 22) Fall Time of CCLK and CDIN (Note 22) Transition Time from CCLK to CDOUT Valid (Note 23) Time from CS rising to CDOUT High-Z Symbol fsclk tsrs tspi tcsh tcss tscl tsch tdsu tdh tr2 tf2 tr2 tf2 Min 500 500 1.0 20 66 66 40 15 Max 6 100 100 100 100 Unit MHz ns ns µs ns ns ns ns ns ns ns ns ns Notes: 20. tspi only needed before first falling edge of CS after RST rising edge. tspi = 0 at all other times. 21. Data must be held for sufficient time to bridge the transition time of CCLK. 22. For FSCK < 1 MHz. 23. CDOUT should not be sampled during this time. RST t srs CS t spi t css CCLK t r2 CDIN t scl t sch t csh t f2 t dsu t dh Hi-Impedance CDOUT t scdov t scdov t cscdo Figure 6. Software Mode Timing - SPI Mode DS721A6 25 CS42324 3. TYPICAL CONNECTION DIAGRAMS +3.3 V +9 V to +12 V 10 µF 0.1 µF 0.1 µF 10 µF VD +3.3 V 3.3 µF 10 µF 0.1 µF VBIAS VCMADC FILT+ 1 µF 3.3 µF 0.1 µF 1 µF 0.1 µF GND 0.1 µF 3.3 µF 0.1 µF VA VA_H VA_H M UTEC 1 AOUT1A 470 Ω 3.3 µF 3.3 µF 10 k Ω 10 k Ω 470 Ω Optional Analog Muting Optional Analog Muting CS42324 AOUT1B MUTEC 2 AOUT2A * * C * See Note 2 C 2 Vrms Left Analog Out 1 2 Vrms Right Analog Out 1 470 Ω 3.3 µF 3.3 µF 10 k Ω 10 k Ω 470 Ω Optional Analog Muting VCMBUF VCMDAC Note 2 : For best response to Fs /2 : * * C * See Note 2 C 2 Vrms Left Analog Out 2 AOUT2B 2 Vrms Right Analog Out 2 C= Rext + 470 4πFs(Rext × 470) MUTEC 3 AOUT3A 3.3 µF 3.3 µF 470 Ω 10 k Ω 10 k Ω 470 Ω This circuitry is intended for applications where the CS 42324 connects directly to a line level output. For internal routing applications please see the DAC Analog Output Characteristics section for loading lim itations . R ext is the load im pedance . * * C * See Note 2 C 2 Vrms Left Analog Out 3 AOUT3B MCLK2 SCLK2 LRCK2 2 Vrms Right Analog Out 3 * Capacitors must be C0G or equivalent 1 µF SDIN1 SDIN2 MCLK1 SCLK1 S OC/DSP LRCK1 SDOUT INT OVFL RST SCL/CCLK SDA/CDOUT AD0/CS AD1/CDIN 2 kΩ +1.8V to +3.3V See Note 1 AIN1A 1 µF 2 Vrms Left Analog In 1 2 Vrms Right Analog In 1 2 Vrms Left Analog In 2 2 Vrms Right Analog In 2 2 Vrms Left Analog In 3 2 Vrms Right Analog In 3 2 Vrms Left Analog In 4 2 Vrms Right Analog In 4 2 Vrms Left Analog In 5 2 Vrms Right Analog In 5 AIN1B 1 µF AIN2A 1 µF AIN2B 1 µF AIN3A 1 µF AIN3B 1 µF AIN4A 1 µF 2 kΩ VL 0.1 µF AIN4B 1 µF AIN5A 1 µF AIN5B Note 1: Resistors are required for I ²C control port operation GND GNDH Figure 7. Typical Connection Diagram - Software Mode 26 DS721A6 CS42324 +3.3 V +9 V to +12 V 10 µF 0.1 µF 0.1 µF 10 µF VD +3.3 V 3.3 µF 10 µF 0.1 µF VBIAS VCMADC FILT+ 1 µF 3.3 µF 0.1 µF 1 µF 0.1 µF GND 0.1 µF 3.3 µF 0.1 µF VA VA_H VA_H MUTEC1 AOUT1A 470 Ω 3.3 µF 3.3 µF 10 kΩ 10 kΩ 470 Ω Optional Analog Muting Optional Analog Muting CS42324 AOUT1B MUTEC2 AOUT2A * * C * See Note 1 C 2 Vrms Left Analog Out 1 2 Vrms Right Analog Out 1 470 Ω 3.3 µF 3.3 µF 10 kΩ 10 kΩ 470 Ω Optional Analog Muting VCMBUF VCMDAC Note 1 : For best response to Fs/2 : * * C * See Note 1 C 2 Vrms Left Analog Out 2 AOUT2B MUTEC3 AOUT3A 3.3 µF 3.3 µF 2 Vrms Right Analog Out 2 Rext + 470 C= 4πFs(Rext × 470) 470 Ω 10 kΩ 10 kΩ 470 Ω This circuitry is intended for applications where the CS42324 connects directly to a line level output. For internal routing applications please see the DAC Analog Output Characteristics section for loading limitations. R ext is the load impedance. * * C * See Note 1 C 2 Vrms Left Analog Out 3 AOUT3B MCLK2 SCLK2 LRCK2 2 Vrms Right Analog Out 3 * Capacitors must be C0G or equivalent 1 µF SDIN1 SDIN2 MCLK1 SCLK1 LRCK1 SOC/DSP VL * See Note 2 5 kΩ AIN1A 1 µF 2 Vrms Left Analog In 1 2 Vrms Right Analog In 1 2 Vrms Left Analog In 2 2 Vrms Right Analog In 2 2 Vrms Left Analog In 3 2 Vrms Right Analog In 3 2 Vrms Left Analog In 4 2 Vrms Right Analog In 4 2 Vrms Left Analog In 5 2 Vrms Right Analog In 5 AIN1B 1 µF AIN2A 1 µF AIN2B SDOUT 1 µF RST OVFL M0 M1 MDIV MUTE DIF +1.8V to +3.3V VL 0.1 µF AIN3A 1 µF AIN3B 1 µF AIN4A 1 µF AIN4B 1 µF AIN5A 1 µF AIN5B Note 2 : Pull-up on SDOUT indicates hardware mode operation GND GNDH Figure 8. Typical Connection Diagram - Hardware Mode DS721A6 27 CS42324 4. APPLICATIONS 4.1 System Clocking The CS42324 will operate at sampling frequencies from 4 kHz to 108 kHz. This range is divided into two speed modes as shown in Table 2. Speed Mode Single-Speed Double-Speed Master Mode Sampling Frequency Slave Mode Sampling Frequency 4-54 kHz 50-108 kHz 4-54 kHz 50-108 kHz Table 2. Speed Modes The CS42324 has two serial ports which can operate synchronously or asynchronously. Serial Port 1 (SP1) consists of the SCLK1 and LRCK1 signals. Serial Port 2 (SP2) consists of the SCLK2 and LRCK2 signals. The serial audio output, SDOUT, and serial audio inputs, SDIN1 and SDIN2, can be independently assigned to either of the two serial ports for ease of clocking. Each serial port may be independently placed into Single- or Double-Speed Mode. The serial ports may also be independently placed into Master or Slave Mode. 4.1.1 Master Clock In both Synchronous and Asynchronous Modes, MCLKx (MCLK1 and/or MCLK2) and the corresponding LRCKx must maintain an integer ratio. Some common ratios are shown in Tables 3 and 4. The LRCKx frequency is equal to Fs, the frequency at which audio samples for each channel are clocked into or out of the device. The SP1_SPEED and SP2_SPEED bits and the MCLKx FREQ bits configure the device to generate the proper clocks in Master Mode and receive the proper clocks in Slave Mode when auto detect mode is disabled. Tables 3 and 4 illustrate several standard audio sample rates and the required MCLKx and LRCKx frequencies. Mode LRCKx (kHz) 32 SINGLE SPEED MODE (SSM) MCLKx FREQ [1:0] MDIV pin 44.1 48 MCLKx (MHz) 128x 192x 256x 8.1920 11.2896 12.2880 00 0 384x 12.2880 16.9344 18.4320 01 512x 16.3840 22.5792 24.5760 10 1 768x 24.5760 33.8680 36.8640 11 - Table 3. Single-Speed Mode Common Clock Frequencies Mode LRCKx (kHz) 64 MCLKx (MHz) 128x 8.1920 11.2896 12.2880 00 0 192x 12.2880 16.9344 18.4320 01 256x 16.3840 22.5792 24.5760 10 1 384x 24.5760 33.8680 36.8640 11 512x 768x - DOUBLE SPEED MODE (DSM) MCLKx FREQ [1:0] MDIV pin 88.2 96 Table 4. Double-Speed Mode Common Clock Frequencies 28 DS721A6 CS42324 4.1.2 Synchronous / Asynchronous Mode By default, the CS42324 operates in Synchronous Mode with both serial ports synchronous to MCLK1. In this mode, the serial ports may operate at different synchronous rates as set by the SP1_SPEED and SP2_SPEED bits, and MCLK2 does not need to be provided (the MCLK2 pin should be left unconnected if not required). If the SPx_MCLK (SPx = SP1 and/or SP2) bits in serial ports 1 and 2 are set differently, the CS42324 will operate in Asynchronous Mode. The serial ports will operate asynchronously with Serial Port 1 clocked from its SP1_MCLK selection and Serial Port 2 clocked from its SP2_MCLK selection. In this mode, the serial ports may operate at different asynchronous rates. In Hardware Mode MCLK1 is the master clock source for all internal circuits. Clock selection and asynchronous operation are not available. 4.2 Serial Port Operation Each CS42324 serial audio interface port operates as either a clock slave or master. They accept externally generated clocks in slave mode (LRCKx and SCLKx pins are inputs, generated clocks shown in Figure 9 are disabled) and will generate synchronous clocks derived from an input master clock (MCLK1/MCLK2) in master mode (LRCKx and SCLKx pins are outputs, generated clocks shown in Figure 9 are enabled). SP1_M/S Generated-LRCK1 LRCK1 pin Internal-LRCK1 To converters SP1_M/S Generated-SCLK1 SCLK1 pin Internal-SCLK1 To converters Master Mode Clock Generation LRCK2 pin Internal-LRCK2 To converters SP2_M/S Generated-SCLK2 SCLK2 pin Internal-SCLK2 To converters Master Mode Clock Generation SP2_M/S Generated-LRCK2 Figure 10 on page 30 Figure 10 on page 30 Serial Port 1 (SP1) Serial Port 2 (SP2) Figure 9. Serial Port Topology The LRCK, Fs, is the frequency at which audio samples for each channel are clocked into or out of the device. In slave mode, LRCK should be synchronously derived from the MCLK selected in SPx_MCLK register. The SCLK is the bit clock which is used to clock in the serial audio data stream. SCLK should adhere to the timing requirements outlined in “Switching Characteristics - Serial Audio” on page 22. The SP1_SPEED, SP2_SPEED, MCLK1 FREQ[1:0] and MCLK2 FREQ[1:0] Software Mode control bits or the M1, M0, and MDIV hardware control pins, configure the device to generate the proper clocks in Master Mode and receive the proper clocks in Slave Mode. In hardware mode, control pins M1 and M0 configure the master/slave mode setting for the serial ports as well as the speed mode as shown in Table 5. M0 (Pin 1) 0 0 1 1 M1 (Pin 2) 0 1 0 1 Serial Port Configuration Clock Master, Single-Speed Mode Clock Master, Double-Speed Mode Reserved Clock Slave, Auto-detect Speed Mode Table 5. M1 and M0 Mode Pins in Hardware Mode DS721A6 29 CS42324 4.2.1 Master Mode As a clock master, the LRCKx and SCLKx of each serial port will operate as outputs. The two serial ports may be independently placed into Master or Slave Mode. Each LRCKx and SCLKx are internally derived from the MCLKx selected by the SP1_MCLK and SP2_MCLK signals as shown in Figure 10. MCLK1 FREQ[1:0] ÷256 ÷1 ÷1.5 MCLK1 ÷2 ÷3 10 11 ÷2 SP1_MCLK MCLK2 FREQ[1:0] ÷256 ÷1 ÷1.5 MCLK2 ÷2 ÷3 10 ÷4 11 SP2_MCLK ÷2 0 Generated-SCLK2 1 00 0 01 Internal-MCLK2 1 SP2_SPEED ÷128 0 Generated-LRCK2 1 00 01 Internal-MCLK1 0 1 ÷4 0 Generated-SCLK1 1 SP1_SPEED ÷128 0 Generated-LRCK1 1 Figure 10. Master Mode Clock Generation 4.2.2 Slave Mode In Slave Mode, SCLKx and LRCKx operate as inputs. Each serial port may be independently placed into Slave Mode. The Left/Right clock signal, LRCKx, must be equal to the sample rate, Fs. The serial bit clock, SCLKx, must be equal to 128x, 64x, 48x, or 32x Fs depending on the desired speed mode. Refer to Table 6 for required serial bit clock to Left/Right clock ratios. If operating in Asynchronous Mode, LRCK1 and SCLK1 must be synchronously derived from the SP1’s selected MCLK, and LRCK2 and SCLK2 must be synchronously derived from SP2’s selected MCLK. If operating in Synchronous Mode, SCLK1, LRCK1, SCLK2 and LRCK2 must be synchronously derived from the same MCLK. For more information on Synchronous and Asynchronous Modes, see “Synchronous / Asynchronous Mode” on page 29. Serial Data Format I²S, LJ or RJ Data Format 32, 48, 64, 128 SCLKx to LRCKx Ratio Single Speed Mode Double Speed Mode 32, 48, 64 Table 6. Slave Mode SCLK/LRCK Ratios The speed of each serial port is automatically determined based on the input MCLKx to LRCKx ratio when the Auto-Detect function is enabled. Certain input clock ratios will then require an internal divide-by-two of MCLKx using either the MCLKx FREQ bits or the MDIV hardware control pin. Mode MCLKx to LRCKx Ratio Single Speed Mode Double Speed Mode SW Auto Mode Detect 256, 384, 512, 768 128, 192, 256, 384 HW Auto Mode Detect 256, 512 128, 256 See Table 3 an Table 4 on page 28 for clock ratio configuration. Table 7. MCLKx to LRCKx Ratios 30 DS721A6 CS42324 4.2.3 ADC, DAC1, and DAC2 clock selection The ADC, DAC1, and DAC2 can be independently set to use either of the two serial ports as a clock source. Each also has control over which MCLK to use. This allows for full flexibility in configuration of the converter. Master/Slave control is achieved at the serial port level (See Figure 9 on page 29); the internal converters discussed here are always slave. Each converter has a bit in the registers (xxx_SP, where xxx = ADC, DAC1, or DAC2) which allows selection of the SCLK/LRCK pair used for the converter. The xxx_MCLK bits select which MCLK source to use for the converter. If the serial port selected for use is in master mode, this selection must be the same as the MCLK_SPx for the serial port which is in use. In Slave mode the MCLK selected must be synchronous to the LRCK/SCLK selected by xxx_SP. ADC_MCLK DAC1_MCLK DAC2_MCLK Internal-MCLK1 Internal-MCLK2 0 1 Internal-MCLK1 Internal-MCLK2 0 1 Internal-MCLK1 Internal-MCLK2 0 1 ADC_SP DAC1_SP DAC2_SP Internal-LRCK1 Internal-LRCK2 0 1 Internal-LRCK1 0 1 Internal-LRCK1 0 1 ADC Internal-LRCK2 DAC1 Internal-LRCK2 DAC2 Internal-SCLK1 Internal-SCLK2 0 1 Internal-SCLK1 Internal-SCLK2 0 1 Internal-SCLK1 Internal-SCLK2 0 1 ADC_DIF[2:0] SDOUT SDIN1 DAC1_DIF[2:0] SDIN2 DAC2_DIF[2:0] Figure 11. Converter Clocking 4.2.4 High-Impedance Digital Output Each serial port may be placed on a clock/data bus that allows multiple masters, without the need for external buffers. The 3ST_SP1, 3ST_SP2 and 3ST_SDOUT bits place the internal buffers for the serial port signals in a high-impedance state, allowing another device to transmit clocks or data without bus contention. CS42324 Transm itting Device #1 3ST_SDOUT SDOUT Transm itting Device #2 3ST_SPx SCLKx/LRCKx Receiving Device Figure 12. Tri-State Serial Port DS721A6 31 CS42324 4.2.5 Digital Interface Formats Each converter (ADC, DAC1, and DAC2) has independent selection for serial formats (I²S, Left-Justified, etc.). Data is clocked out of the ADC or into the DAC on the rising edge of SCLK. Figures 13-17 illustrate the general structure of each format. Refer to “Switching Characteristics - Serial Audio” on page 22 or “Switching Characteristics - Serial Audio (Cont.)” on page 23 for exact timing relationship between clocks and data. For a complete overview of Serial Audio Interface Formats, please reference Application Note AN282. DIF (Pin 5) Setting LO HI Left-Justified Interface I²S Interface Selection Table 8. Hardware Mode Interface Format Control LRCKx SCLKx SDIN1/2 SDOUT MSB L eft C h a n n el Rig ht C h a n n el LS B AOUTxA AINxA MSB AOUTxB AINxB LS B MSB Figure 13. Left-Justified up to 24-Bit Data LRCKx SCLKx SDIN1/2 SDOUT M SB L eft C h a n n el Rig ht C h a n n el LS B AOUTxA AINxA MSB AOUTxB AINxB LS B MSB Figure 14. I²S up to 24-Bit Data LRCKx SCLKx SDIN1/2 SDOUT M SB AOUTxA AINxA LS B MSB AOUTxB AINxB LS B L e ft C h a n n e l R ig ht C h a n n e l Figure 15. Right-Justified 16-Bit Data, Right-Justified 24-Bit Data 4.2.6 Synchronization of Multiple Devices In systems where multiple ADCs and DACs are required, care must be taken to achieve simultaneous sampling. To ensure synchronous sampling, the master clocks and left/right clocks must be the same for all of the CS42324’s in the system. If only one master clock source is needed, one solution is to place one CS42324 in Master Mode, and slave all of the other devices to the one master. 32 DS721A6 CS42324 4.3 4.3.1 Analog-to-Digital Data Path ADC Analog Input Multiplexer AINxA and AINxB are the analog inputs, internally biased to VCMADC. The CS42324 contains a stereo 5-to-1 analog input multiplexer which can select one of 5 possible stereo analog input sources and route it to the ADC. Figure 16 shows the architecture of the input multiplexer. AIN1A AIN2A AIN3A AIN4A AIN5A MUX Out to ADC Channel A AIN_SEL[2:0] AIN1B AIN2B AIN3B AIN4B AIN5B MUX Out to ADC Channel B Figure 16. Analog Input Architecture “Section 6.9 “ADC Control (Address 0Ah)” on page 52” outlines the bit settings necessary to control the input multiplexer. By default, line level input 1 is selected. 4.3.2 ADC Description The ADC analog modulator samples the input at 6.144 MHz (MCLK=12.288 MHz). The digital filter will reject signals within the stopband of the filter. However, there is no rejection for input signals which are (n × 6.144 MHz) the digital passband frequency, where n=0,1,2,... Refer to the Typical Connection Diagram for the recommended analog input circuit that will attenuate noise energy at 6.144 MHz. The use of capacitors which have a large voltage coefficient (such as general purpose ceramics) must be avoided since these can degrade signal linearity. Any unused analog input pairs should be left unconnected. The ADC output data is in two’s complement binary format. For inputs above positive full-scale or below negative full-scale, the ADC will output 7FFFFFH or 800000H, respectively and cause the ADC overflow bit to be set to a ‘1’. Given the two’s complement format, low-level signals may cause the MSB of the serial data to periodically toggle between ‘1’ and ‘0’, possibly introducing noise into the system as the bit switches back and forth. To prevent this phenomena, a constant DC offset is added to the serial data bringing the low-level signal just above the point at which the MSB would normally toggle, thus reducing the noise introduced. Note that this offset is not removed (refer to “ADC Analog Characteristics - Commercial (-CQZ)” on page 17 for the specified offset level). DS721A6 33 CS42324 4.3.3 High-Pass Filter and DC Offset Calibration When using operational amplifiers in the input circuitry driving the CS42324, a small DC offset may be driven into the A/D converter. The CS42324 includes a high-pass filter after the decimator to remove any DC offset which could result in recording a DC level, possibly yielding clicks when switching between devices in a multichannel system. The high-pass filter continuously subtracts a measure of the DC offset from the output of the decimation filter. If the HPFFreeze bit is set during normal operation, the current value of the DC offset for the each channel is frozen and this DC offset will continue to be subtracted from the conversion result. This feature makes it possible to perform a system DC offset calibration by: 1. Running the CS42324 with the high-pass filter enabled until the filter settles. See “ADC Digital Filter Characteristics” on page 19 for filter settling time. 2. Disabling the high-pass filter and freezing the stored DC offset for continuous subtraction. A system calibration performed in this way eliminates offsets anywhere in the signal path between the calibration point and the CS42324. 4.3.4 Digital Attenuation Control Digital attenuation control functions are implemented, offering independent channel control for the ADC PCM signal path. The volume controls are programmable to ramp in increments of 0.5 dB at a rate controlled by the ADC soft ramp. Each ADC signal path may also be independently muted via mute control bits. When enabled, each bit attenuates the signal to its maximum value. When the mute bit is disabled, the signal returns to the attenuation level set in the respective volume control register. The attenuation is ramped up and down at the rate specified by the ADC_SOFT. 4.4 4.4.1 Digital-to-Analog Data Path Digital Volume Control Two stereo digital volume control functions are implemented, offering independent channel control for DAC1 and DAC2 PCM signal paths into the digital mixer. The volume controls are programmable to ramp in increments of 0.5 dB at a rate controlled by the DAC1/2 soft ramp/zero cross settings. Each DAC1/2 signal path may also be independently muted via mute control bits. When enabled, each bit attenuates the signal to its maximum value. When the mute bit is disabled, the signal returns to the attenuation level set in the respective volume control register. The attenuation is ramped up and down at the rate specified by the DAC1/2_SOFT and DAC1/2_ZC bits. 4.4.2 Mono Channel Mixer Independent channel mixers for DAC1 and DAC2 may be used to create a mix of the left and right channels PCM signals. This mix allows the user to produce a MONO signal from a stereo source. The mixer may also be used to implement a left/right channel swap. 34 DS721A6 CS42324 4.4.3 De-Emphasis Filter The CS42324 includes on-chip digital de-emphasis optimized for a sample rate of 44.1 kHz. The filter response is shown in Figure 17. The frequency response of the de-emphasis curve will scale proportionally with changes in sample rate, Fs. The de-emphasis feature is included to accommodate audio recordings that utilize 50/15 μs pre-emphasis equalization as a means of noise reduction. De-emphasis is only available in Single-Speed Mode Gain dB T1=50 µs 0dB T2 = 15 µs -10dB F1 3.183 kHz F2 Frequency 10.61 kHz Figure 17. De-Emphasis Curve 4.4.4 Internal Digital Loopback The CS42324 supports an internal digital loopback mode in which the ADC’s output data can be internally routed to either of the DAC inputs. This mode may be activated by setting the DACx_LOOP_BACK bit in “DAC1 Control (Address 0Bh)” on page 53 and “DAC2 Control (Address 0Ch)” on page 55. During this mode, the ADC and DAC will need to operate at the same synchronous sample rate. When the DACx_LOOP_BACK bit is set, the respective DACx_DIF[2:0] bits must be set to the same value as the ADC_DIF[2:0] register. During loop back mode, the ADC data will continue to be present on the SDOUT pin in the format selected by the ADC_DIF[2:0] bits. 4.4.5 DAC Description The CS42324 uses a switched current architecture followed by on chip current to voltage conversion and continuous time low-pass filter. The digital interpolator response is shown in the “DAC Digital Filter Response Plots” on page 67. The recommended external analog circuitry is shown in the “Typical Connection Diagrams” on page 26. The CS42324 DAC does not include phase or amplitude compensation for an external filter. Therefore, the DAC system phase and amplitude response will be dependent on the external analog circuitry. DS721A6 35 CS42324 4.4.6 Analog Output Multiplexer The CS42324 contains three independent stereo 7-to-1 analog output multiplexers which can select one of seven possible stereo analog output sources and route it to the AOUTxA and AOUTxB pins. Figure 18 shows the architecture of the analog output multiplexer. DAC1A DAC2A AIN1A AIN2A AIN3A AIN4A AIN5A AOUTx_SEL[2:0] DAC1B DAC2B AIN1B AIN2B AIN3B AIN4B AIN5B MUX AOUTxB MUX AOUTxA Figure 18. Analog Output Architecture “Section 6.12 “AOUT1 Control (Address 0Dh)” on page 56” and Section 6.13 “AOUT2 Control (Address 0Eh)” on page 57 outline the bit settings necessary to control the output multiplexer. 4.4.7 Output Transient Control The CS42324 uses Popguard technology to minimize the effects of output transients during power-up and power-down. This technique eliminates the audio transients commonly produced by single-ended singlesupply converters when it is implemented with external DC-blocking capacitors connected in series with the audio outputs. To make best use of this feature, it is necessary to understand its operation. 4.4.7.1 Power-Up When the device is initially powered up, the audio outputs AOUTxA and AOUTxB are clamped to VCMBUF which is initially low. After the PDN bit is released (set to ‘0’) the outputs begin to ramp with VCMBUF towards the nominal quiescent voltage. This ramp takes approximately 200 ms to complete. The gradual voltage ramping allows time for the external DC-blocking capacitors to charge to VCMBUF, effectively blocking the quiescent DC voltage. Audio output from the DACs will begin after approximately 2000 sample periods. 4.4.7.2 Power-Down To prevent audio transients at power-down, the DC-blocking capacitors must fully discharge before turning off the power. In order to do this, either the PDN bit should be set or the device should be reset about 250 ms before removing power. During this time, the voltage on VCMBUF and the AOUTx outputs discharge gradually to GND. If power is removed before this 250 ms time period has passed, a transient will occur when the VA supply drops below that of VCMBUF. There is no minimum time for a power cycle; power may be re-applied at any time. 36 DS721A6 CS42324 4.4.7.3 Serial Interface Clock Changes When changing the serial port clock ratio or sample rate, it is recommended that zero data (or near zero data) be present on SDIN for at least 10 LRCK samples before the change is made. During the clocking change, the DAC outputs will always be in a zero data state. If non-zero serial audio input is present at the time of switching, a slight click or pop may be heard as the DAC output automatically goes to it’s zero data state. 4.4.8 Mute Control The MUTECx pins become active during power-up initialization, reset, software/hardware muting, and power-down mode (PDN=1). The MUTECx pins are intended to be used as control for an external mute circuit in order to add off-chip mute capability. Use of the Mute Control function is not mandatory but recommended for designs requiring the absolute minimum in extraneous clicks and pops. Also, use of the Mute Control function can enable the system designer to achieve idle channel noise/signal-to-noise ratios which are only limited by the external mute circuit. The MUTECx pins are active-low CMOS drivers. 4.5 Initialization The initialization and Power-Down sequence flow chart is shown in Figure 19 on page 39. The CODEC enters a Power-Down state upon initial power-up. The interpolation and decimation filters, delta-sigma modulators and software registers are reset. The internal voltage reference, multi-bit DACs and ADC, and on-chip amplifiers are powered down. 4.5.1 Determining Hardware or Software Mode The device will remain in the Power-Down state until the RST pin is brought high. If there is a pull-up on SDOUT, or SDOUT is held high by any other means at the time RST pin is brought high, the device will enter Hardware mode and begin powering up immediately. If no pull-up is present, or SDOUT is held low by any other means at the time RST pin is brought high, the device will enter software mode. 4.5.2 Hardware Mode Start-Up When the pull-up on SDOUT is present Hardware Mode is selected. Once hardware mode is selected, the hardware mode configuration pins are used to set up the device and power-up will occur following the HW startup path as shown in Figure 19 on page 39. The modes of configuration for this mode can be found in Section 4.6.1 "Hardware Mode" on page 40. Because of the limited configuration abilities in Hardware mode, many modes of operation are not available. Only MCLK1 needs to be applied. Once the appropriate MCLK1 is valid and RST is high, the quiescent voltage, VCMADC and VCMBUF, and the internal voltage references, FILT+ and VCM_ADC, will begin powering up to normal operation. During this voltage reference ramp delay, both SDOUT and the AOUTxA/AOUTxB outputs will be automatically muted. Once LRCKx is valid, MCLKx occurrences are counted over one LRCKx period to determine the MCLKx/LRCKx frequency ratio and normal operation begins. It is recommended that RST be activated if the analog or digital supplies drop below the recommended operating condition to prevent power-glitch-related issues. DS721A6 37 CS42324 4.5.2.1 Recommended Power-Up Sequence, Hardware Mode 1. Hold RST low until MCLK1 and the power supplies are stable. 2. Bring RST high (SDOUT must be pulled high). 3. Apply all LRCKx, SCLKx and SDIN signals for normal operation to begin. 4. Bring RST low if the analog or digital supplies drop below the recommended operating condition to prevent power glitch related issues. 4.5.2.2 Recommended Power-Down Sequence, Hardware Mode To minimize audible pops when turning off or placing the CODEC in standby: 1. Mute the SDIN1 and SDIN2 streams feeding the CODEC. 2. Bring RST low. 4.5.3 Software Mode Start-Up When no pull-up on SDOUT is present, the Software Mode is accessible once RST is high. The desired register settings can be loaded per the interface descriptions in “Software Mode - I²C Control Port” on page 41. When the desired configuration is complete the PDN bit in “Operational Control (Address 02h)” on page 47 should be set to 0 to initiate the power up sequence. The quiescent voltage, VCMADC and VCMBUF, and the internal voltage references, FILT+ and VCM_ADC, will then begin powering up to normal operation. During this voltage reference ramp delay, both SDOUT and the AOUTxA/AOUTxB outputs will be automatically muted. Once LRCKx is valid, MCLKx occurrences are counted over one LRCKx period to determine the MCLKx/LRCKx frequency ratio and normal operation begins. It is recommended that RST be activated if the analog or digital supplies drop below the recommended operating condition to prevent power-glitch-related issues. 4.5.3.1 Recommended Power-Up Sequence, Software Mode 1. Hold RST low until the power supplies are stable. 2. Bring RST high, the device will be in “standby”. 3. Load the desired register settings while keeping the PDN bit set to ‘1’b. 4. Start MCLK1 (and MCLK2 if it is used) to the appropriate frequency, as discussed in Section 4.1.1. 5. Set the PDN bit to ‘0’b. 6. Apply all LRCKx, SCLKx and SDIN signals for normal operation to begin. 7. Bring RST low if the analog or digital supplies drop below the recommended operating condition to prevent power glitch related issues. 4.5.3.2 Recommended Power-Down Sequence, Software Mode To minimize audible pops when turning off or placing the CODEC in standby: 1. Using the appropriate registers, 9Mute the AOUTxA, AOUTxB, DAC’s & 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. 3. Bring RST low. 38 DS721A6 CS42324 4.5.4 Initialization Flow Chart No Power 1. No audio signal generated. PDN bit = '1'b? Power Applied No Standby Mode 1. No audio signal generated. Yes 2. Control Port Registers retain settings. 3. Update Control Port Registers as Required. Off Mode (Power Applied) 1. No audio signal generated. 2. Control Port Registers reset to default. 20 ms delay RST = Low? Yes Charge Caps 1. VCMADC/VCMDAC Charged to quiescent voltage. 2. Filt+/VBIAS Charged. No DAC / ADC Initialization Yes Pull-up on SDOUT? Digital/Analog Output Muted 20 μs delay (DAC only) Power Off Transition 1. Audible pops. Hardware Mode Minimal feature set support. Software Mode Registers setup to desired settings. Sub-Clocks Applied 1. LRCKx valid. 2. SCLKx valid. 3. Audio samples processed. No 2048 internal MCLKx cycle delay Stand-By Transition 1. Pops suppressed. Reset Transition 1. Pops suppressed. No Valid MCLKx/LRCKx Ratio? Yes RST = Low ERROR: MCLKx/LRCKx ratio change ERROR: Power removed Normal Operation Audio signal generated per control port or standalone settings. PDN bit set to '1'b (software mode only) ERROR: MCLKx removed Analog Output Freeze 1. AOUTx bias = last audio sample. 2. DAC Modulators stop operation. 3. Audible pops. Figure 19. Initialization Flow Chart DS721A6 39 CS42324 4.6 Device Control In Software Mode, all functions and features may be controlled either by two-wire I²C or SPI Software Mode interface. In Hardware Mode, a limited feature set may be controlled via hardware control pins. 4.6.1 Hardware Mode A limited feature-set is available when the CS42324 powers up in Hardware Mode (see “Recommended Power-Up Sequence, Hardware Mode” on page 38) and may be controlled via hardware control pins. Table 9 shows a list of functions/features, the default configuration and the associated hardware control available. Hardware Mode Feature Summary Default Configuration Powered Up ADC Powered Up DAC1 Powered Up DAC2 Enabled; Active low, open drain Enabled (256x/128xFs, 512x/256xFs only) (Selectable) Synchronous only (Selectable) Serial Port 1 Serial Port 2 Soft Ramp Zero Cross Mute Invert Volume (Selectable) Disabled Enabled Disabled Disabled Disabled 0 dB Enabled Continuous DC Subtraction AIN1 Enabled Disabled Disabled Disabled Disabled (‘00’) 0 dB Disabled Output of DAC1 Output of DAC2 AIN1x (Selectable) Feature/Function Power Control SP_ERROR Auto Detect Serial Port Master/Slave and Speed Mode Async / Sync Mode MCLK Divide Serial Port Interface Format Freeze Bit Settings ADC Volume & Gain Hardware Control “M0” and “M1”, pins 1 and 2 (see page 29) “MDIV” pin 3 (see page 30) “DIF” pin 5 (see page 32) MUTE pin 4 (see page 37) ADC High-Pass Filter ADC High-Pass Filter Freeze AIN Input Select to ADC (SDOUT source) DAC1 & DAC2 Volume & Gain Soft Ramp Zero Cross Mute Invert Mixer Volume source source source MUTE DAC1 & DAC2 De-Emphasis AOUT1x AOUT2x AOUT3x AOUTxx Table 9. Hardware Mode Feature Summary 40 DS721A6 CS42324 4.6.2 Software Mode - I²C Control Port Software Mode is used to access the registers, allowing the CS42324 to be configured for the desired operational modes and formats. The operation in Software Mode may be completely asynchronous with respect to the audio sample rates. However, to avoid potential interference problems, the I²C pins should remain static if no operation is required. Software Mode supports the I²C interface, with the CS42324 acting as a slave device. SDA is a bidirectional data line. Data is clocked into and out of the part by the clock, SCL. Pin AD0 forms the least significant bit of the chip address and should be connected through a resistor to VL or GND as desired. The state of the pin is sensed while the CS42324 is being reset. 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 a rising transition while the clock is high. All other transitions of SDA occur while the clock is low. The first byte sent to the CS42324 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 5 bits of the 7-bit address field are fixed at 10011. To communicate with a CS42324, the chip address field, which is the first byte sent to the CS42324, should match 10011 followed by the settings of AD0. 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 CS42324 after each input byte is read, and is input to the CS42324 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 2 1 0 7 6 1 0 7 DATA +1 6 1 0 7 DATA +n 6 1 0 SDA START 1 0 0 1 1 AD1 AD0 0 6 5 4 3 ACK ACK ACK ACK STOP Figure 20. Software Mode 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 1 AD1 AD0 1 DATA 7 0 DATA +1 7 0 DATA + n 7 0 SDA 1 0 0 1 1 AD1 AD0 0 6 5 4 3 2 ACK START ACK START ACK ACK NO ACK STOP Figure 21. Software Mode Timing, I²C Read Since the read operation can not 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. DS721A6 41 CS42324 Send start condition. Send 10011xx0 (chip address & write operation). Receive acknowledge bit. Send MAP byte, auto increment off. Receive acknowledge bit. Send stop condition, aborting write. Send start condition. Send 10011xx1(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. 4.6.3 Software Mode - SPI Control Port In SPI Mode, data is clocked into the serial control data line, CDIN, by the serial clock, CCLK (see Figure 22 for the clock to data relationship). There are no AD0 or AD1 pins. Pin CS is the chip select signal and is used to control SPI writes to the registers. When the device detects a high-to-low transition on the AD0/CS pin after power-up, SPI Mode will be selected. All signals are inputs and data is clocked in on the rising edge of CCLK. 4.6.3.1 SPI Write To write to the device, follow the procedure below while adhering to the Software Mode switching specifications in “Switching Characteristics - Software Mode - SPI Format” section on page 25. 1. Bring CS low. 2. The address byte on the CDIN pin must then be 10011110 (R/W = 0). 3. Write to the memory address pointer, MAP. This byte points to the register to be written. 4. Write the desired data to the register pointed to by the MAP. 5. If the INCR bit (see Section 4.6.4.1) is set to 1, repeat the previous step until all the desired registers are written, then bring CS high. 6. If the INCR bit is set to 0 and further SPI writes to other registers are desired, it is necessary to bring CS high, and follow the procedure detailed from step 1. If no further writes to other registers are desired, bring CS high 4.6.3.2 SPI Read To read from the device, follow the procedure below while adhering to the values specified in “Switching Characteristics - Software Mode - SPI Format” section on page 25. 1. Bring CS low. 2. The address byte on the CDIN pin must then be 10011111 (R/W = 1). 3. CDOUT pin will then output the data from the register pointed to by the MAP, which is set during the SPI write operation. 4. If the INCR bit (see Section 4.6.4.1) is set to 1, keep CS low and continue providing clocks on CCLK to read from multiple consecutive registers. Bring CS high when reading is complete. 42 DS721A6 CS42324 5. If the INCR bit is set to 0 and further SPI reads from other registers are desired, it is necessary to bring CS high, and follow the procedure detailed from step 1. If no further reads from other registers are desired, bring CS high. CS CCLK C H IP ADDRESS CDIN 1001111 R/W C H IP ADDRESS LSB b y te n MSB LSB MSB LSB 1001111 R/W MAP MSB DATA b y te 1 CDOUT High Impedance MAP = Memory Address Pointer, 8 bits, MSB first Figure 22. Software Mode Timing, SPI Mode 4.6.4 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. 4.6.4.1 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 and SPI writes. If INCR is set to 1, MAP will auto increment after each byte is written, allowing block reads or writes of successive registers. 4.7 Interrupts and Overflow The CS42324 has a comprehensive interrupt capability. The INT output pin is intended to drive the interrupt input pin on the host microcontroller. The INT pin may function as either an active high CMOS driver or an active low open-drain driver (see “Operational Control (Address 02h)” on page 47). When configured as active low open-drain, the INT pin has no active pull-up transistor, allowing it to be used for wired-OR hookups with multiple peripherals connected to the microcontroller interrupt input pin. In this configuration, an external pull-up resistor must be placed on the INT pin for proper operation. Many conditions can cause an interrupt, as listed in the interrupt status register descriptions. See “Interrupt Status (Address 18h) (Read Only)” on page 61. Each source may be masked off through mask register bits. In addition, each source may be set to rising edge, falling edge, or level sensitive. Combined with the option of level sensitive or edge sensitive modes within the microcontroller, many different configurations are possible, depending on the needs of the equipment designer. Reading the Interrupt Status register will clear the interrupt condtion. The CS42324 also has a dedicated overflow output. The OVFL pin functions as active low open drain and has no active pull-up transistor, thereby requiring an external pull-up resistor. The OVFL pin outputs an OR of the ADC Overflow Positive and Negative conditions available in the Interrupt Status register; however, these conditions do not need to be unmasked for proper operation of the OVFL pin. DS721A6 43 CS42324 5. REGISTER QUICK REFERENCE This table shows the register names and their associated default values. All bits marked as “Reserved” must maintain their default values. Addr 00h Function Device ID page 46 7 DEVICE3 0 Reserved 0 Reserved 0 SP1_M/S 0 SP2_M/S 0 Reserved 0 6 DEVICE2 1 SYS_MCLK 1 PDN 1 Reserved 0 Reserved 0 Reserved 0 ADC_ MCLK 0 DAC1_ MCLK 0 DAC2_ MCLK 0 Reserved 0 ADC_ HPFRZ 0 DAC1_ SNGVOL 0 DAC2_ SNGVOL 0 Reserved 0 Reserved 0 Reserved 0 5 DEVICE1 1 DAC2_ MuteL 0 INT_HL 0 Reserved 0 Reserved 0 Reserved 0 Reserved 0 Reserved 0 Reserved 0 Reserved 0 ADC_ SOFT 1 DAC1_SOFT 1 DAC2_ SOFT 1 Reserved 0 Reserved 0 Reserved 0 4 DEVICE0 0 DAC2_ MuteR 0 FREEZE 0 SP1_ SPEED 0 SP2_ SPEED 0 Reserved 0 ADC_ SP 0 DAC1_SP 1 DAC2_SP 1 Reserved 0 Reserved 0 DAC1_ZC 0 DAC2_ ZC 0 Reserved 0 Reserved 0 Reserved 0 3 REV3 x DAC1_ MuteL 0 Reserved 0 MCLK1 FREQ1 0 MCLK2 FREQ1 0 Reserved 0 Reserved 1 Reserved 1 Reserved 1 Reserved 0 Reserved 0 DAC1_ LOOPBACK 0 DAC2_ LOOPBACK 0 MUTEC1 0 MUTEC2 0 MUTEC3 0 2 REV2 x DAC1_ MuteR 0 TRI-SDOUT 0 MCLK1 FREQ0 0 MCLK2 FREQ0 0 Reserved 0 Reserved 0 Reserved 0 Reserved 0 Reserved 0 AIN_SEL2 0 DAC1_INV 0 DAC2_INV 0 AOUT1_ SEL2 1 AOUT2_ SEL2 1 AOUT3_ SEL2 0 1 REV1 x ADC_ MuteL 0 TRI-SP1 0 Reserved 0 Reserved 0 Reserved 0 ADC_DIF1 0 DAC1_DIF1 0 DAC2_DIF1 0 Reserved 0 AIN_SEL1 0 0 REV0 x ADC_ MuteR 0 TRI-SP2 0 SP1_MCLK 0 SP2_MCLK 0 Reserved 0 ADC_DIF0 0 DAC1_DIF0 0 DAC2_DIF0 0 Reserved 0 AIN_SEL0 1 01h Mute Control page 46 02h Operational Control page 47 03h Serial Port 1 Control page 49 04h Serial Port 2 Control page 50 05h Reserved 06h ADC clocking page 50 Reserved 0 Reserved 0 Reserved 0 Reserved 0 07h DAC1 clocking page 51 08h DAC2 clocking page 52 09h Reserved 0Ah ADC Control page 52 Reserved 1 DAC1_ DEPH 0 DAC2_ DEPH 0 Reserved 0 Reserved 0 Reserved 0 0Bh DAC1 Control page 53 DAC1_MIX1 DAC1_MIX0 0 0 0Ch DAC2 Control page 55 DAC2_MIX1 DAC2_MIX0 0 AOUT1_ SEL1 1 AOUT2_ SEL1 1 AOUT3_ SEL1 0 0 AOUT1_ SEL0 0 AOUT2_ SEL0 1 AOUT3_ SEL0 1 0Dh AOUT1 Control page 56 0Eh AOUT2 Control page 57 0Fh AOUT3 Control page 57 44 DS721A6 CS42324 Addr 10h Function ADC Ch A Volume Control page 58 7 ADCA_ VOL7 0 ADCB_ VOL7 0 DAC1A_ VOL7 0 DAC1B_ VOL7 0 DAC2A_ VOL7 0 DAC2B_ VOL7 0 SP2_ CLKERR1 0 DAC2_ AMUTELM 0 DAC2_ AMUTEL 0 6 ADCA_ VOL6 0 ADCB_ VOL6 0 DAC1A_ VOL6 0 DAC1B_ VOL6 0 DAC2A_ VOL6 0 DAC2B_ VOL6 0 SP2_ CLKERR0 0 DAC2_ AMUTERM 0 DAC2_ AMUTER 0 5 ADCA_ VOL5 0 ADCB_ VOL5 0 DAC1A_ VOL5 0 DAC1B_ VOL5 0 DAC2A_ VOL5 0 DAC2B_ VOL5 0 SP1_ CLKERR1 0 DAC1_ AMUTELM 0 DAC1_ AMUTEL 0 4 ADCA_ VOL4 0 ADCB_ VOL4 0 DAC1A_ VOL4 0 DAC1B_ VOL4 0 DAC2A_ VOL4 0 DAC2B_ VOL4 0 SP1_ CLKERR0 0 DAC1_ AMUTERM 0 DAC1_ AMUTER 0 3 ADCA_ VOL3 0 ADCB_ VOL3 0 DAC1A_ VOL3 0 DAC1B_ VOL3 0 DAC2A_ VOL3 0 DAC2B_ VOL3 0 DAC_ AMUTE1 0 SP2_ CLKERRM 0 SP2_ CLKERR 0 2 ADCA_ VOL2 0 ADCB_ VOL2 0 DAC1A_ VOL2 0 DAC1B_ VOL2 0 DAC2A_ VOL2 0 DAC2B_ VOL2 0 DAC_ AMUTE0 0 SP1_ CLKERRM 0 SP1_ CLKERR 0 1 ADCA_ VOL1 0 ADCB_ VOL1 0 DAC1A_ VOL1 0 DAC1B_ VOL1 0 DAC2A_ VOL1 0 DAC2B_ VOL1 0 ADC_ OVFLx1 0 ADC_ OVFLPM 0 ADC_ OVFLP 0 0 ADCA_ VOL0 0 ADCB_ VOL0 0 DAC1A_ VOL0 0 DAC1B_ VOL0 0 DAC2A_ VOL0 0 DAC2B_ VOL0 0 ADC_ OVFLx0 0 ADC_ OVFLNM 0 ADC_ OVFLN 0 11h ADC Ch B Volume Control page 58 12h DAC1 Ch A Volume Control page 58 13h DAC1 Ch B Volume Control page 58 14h DAC2 Ch A Volume Control page 59 15h DAC2 Ch B Volume Control page 59 16h Interrupt Mode page 59 17h Interrupt Mask page 59 18h Interrupt Status page 61 DS721A6 45 CS42324 6. REGISTER DESCRIPTION All registers are read/write except where otherwise noted. See the following bit definition tables for bit assignment information. The default state of each bit after release of reset is listed in the shaded row of each bit description table. When writing to registers containing “Reserved” bits, all bits marked as “Reserved” must maintain their default values. 6.1 7 Device I.D. and Revision Register (Address 00h) (Read Only) 6 DEVICE2 5 DEVICE1 4 DEVICE0 3 REV3 2 REV2 1 REV1 0 REV0 DEVICE3 6.1.1 Device I.D. (Read Only) I.D. code for the CS42324. DEVICE[3:0] 0110 CS42324 Device 6.1.2 Chip Revision (Read Only) CS42324 revision level. REV[3:0] 000 001 A1 B0 Revision Level 6.2 7 Mute Control (Address 01h) 6 SYS_MCLK 5 DAC2_ MuteL 4 DAC2_ MuteR 3 DAC1_ MuteL 2 DAC1_ MuteR 1 ADC_ MuteL 0 ADC_ MuteR Reserved 6.2.1 System MCLK Source This bit selects which MCLK pin provides the clock for internal state machines. It must always be set to whichever clock is currently active. SYS_MCLK 0 1 MCLK1 MCLK2 System MCLK source 6.2.2 Mute DAC2 Left-Channel When set, this bit engages internal mute circuit on DAC2 output. DAC2_MuteL 0 1 Un-muted Muted Mute status of DAC2 Left-channel 46 DS721A6 CS42324 6.2.3 Mute DAC2 Right-Channel When set, this bit engages internal mute circuit on DAC2 output. DAC2_MuteR 0 1 Un-muted Muted Mute status of DAC2 Right-channel 6.2.4 Mute DAC1 Left-Channel When set, this bit engages internal mute circuit on DAC1 output. DAC1_MuteL 0 1 Unmuted Muted Mute status of DAC1 Left-channel 6.2.5 Mute DAC1 Right-Channel When set, this bit engages internal mute circuit on DAC1 output. DAC1_MuteR 0 1 Un-muted Muted Mute Status of DAC1 Right-Channel 6.2.6 Mute ADC Left-Channel When set, this bit engages internal mute circuit on ADC output. ADC_MuteL 0 1 Un-muted Muted Mute Status of ADC Left-Channel 6.2.7 Mute ADC Right-Channel When set, this bit engages internal mute circuit on ADC output. ADC_MuteR 0 1 Un-muted Muted Mute Status of ADC Right-Channel 6.3 Operational Control (Address 02h) 6 PDN 5 INT_H/L 4 FREEZE 3 Reserved 2 TRI-SDOUT 1 TRI-SP1 0 TRI-SP2 7 Reserved 6.3.1 Global Power-Down When set, this bit places the device in power-down mode. PDN 0 1 Device is running Device is in power-down mode Device Power-Down State DS721A6 47 CS42324 6.3.2 INT Pin High/Low Active (INT_H/L) When this bit is set, the INT pin will function as an active high CMOS driver. When this bit is cleared, the INT pin will function as an active low open drain driver and will require an external pull-up resistor for proper operation. INT_H/L 0 1 Active low, open drain driver Active high, CMOS driver INT Pin Polarity 6.3.3 Freeze This function allows modifications to be made to certain bits without the changes taking effect until the Freeze bit is disabled. To make multiple changes to these bits take effect simultaneously, set the Freeze bit, make all changes, then clear the Freeze bit. The bits affected by the Freeze function are listed in Table 10. FREEZE 0 1 FREEZE Status Changes to registers take effect immediately Changes to registers are held until FREEZE is released Name Mute Control ADC Ch A Vol. Control ADC Ch B Vol. Control DAC1 Ch A Vol. Control DAC1 Ch B Vol. Control DAC2 Ch A Vol. Control DAC2 Ch B Vol. Control Register 01h 0Fh 10h 11h 12h 13h 14h Bit(s) 7:0 7:0 7:0 7:0 7:0 7:0 7:0 Table 10. Freeze-able Bits 6.3.4 Tri-State SDOUT When this bit is set, SDOUT will be placed in a high-impedance state. TRI-SDOUT 0 1 Output High-impedance SDOUT state 6.3.5 Tri-State Serial Port 1 When enabled, and the device is configured as a master, then SCLK1 and LRCK1 of Serial Port 1 (SP1) will be placed in a high-impedance output state. If Serial Port 1 is configured as a slave, SCLK1 and LRCK1 will remain as inputs. TRI-SP1 0 1 SCLK1 and LRCK1 State SCLK1 and LRCK1 operate as inputs if Serial Port 1 is configured as a slave; SCLK1 and LRCK1 operate as outputs if Serial Port 1 is configured as a master SCLK1 and LRCK1 operate as inputs if Serial Port 1 is configured as a slave; SCLK1 and LRCK1 become high-impedance outputs if Serial Port 1 is configured as a master 48 DS721A6 CS42324 6.3.6 Tri-State Serial Port 2 When enabled, and the device is configured as a master, then SCLK2 and LRCK2 of Serial Port 2 (SP2) will be placed in a high-impedance output state. If Serial Port 2 is configured as a slave, SCLK2 and LRCK2 will remain as inputs. SDIN1 and SDIN2 are always configured as inputs. TRI-SP2 0 1 SCLK2 and LRCK2 State SCLK2 and LRCK2 operate as inputs if Serial Port 2 is configured as a slave; SCLK2 and LRCK2 operate as outputs if Serial Port 2 is configured as a master SCLK2 and LRCK2 operate as inputs if Serial Port 2 is configured as a slave; SCLK2 and LRCK2 become high-impedance outputs if Serial Port 2 is configured as a master 6.4 7 Serial Port 1 Control (Address 03h) 6 Reserved 5 Reserved 4 SP1_SPEED 3 MCLK1 FREQ1 2 MCLK1 FREQ0 1 Reserved 0 SP1_MCLK SP1_M/S 6.4.1 Serial Port 1 Master/Slave Select This bit configures Serial Port 1 to operate as either a clock master or clock slave. SP1_M/S 0 1 Slave Mode Master Mode Serial Port 1 Master/Slave Select 6.4.2 Serial Port 1 Speed Mode In Master Mode this bit configures the speed mode of Serial Port 1. SP1_SPEED 0 1 Single-Speed Mode (SSM) Double-Speed Mode (DSM) Serial Port 1 Speed Mode 6.4.3 MCLK1 Divider These bits configure the internal MCLK1 dividers. MCLK1 FREQ[1:0] 00 01 10 11 ÷1 ÷1.5 ÷2 ÷3 MCLK Divider 6.4.4 Serial Port 1 MCLK source This bit selects which MCLK pin provides the clock for deriving Master Mode sub-clocks for Serial Port 1. SP1_MCLK 0 1 MCLK1 MCLK2 Serial Port 1 MCLK source DS721A6 49 CS42324 6.5 7 SP2_M/S Serial Port 2 Control (Address 04h) 6 Reserved 5 Reserved0 4 SP2_SPEED 3 MCLK2 FREQ1 2 MCLK2 FREQ0 1 Reserved 0 SP2_MCLK 6.5.1 Serial Port 2 Master/Slave Select This bit configures Serial Port 2 to operate as either a clock master or clock slave. SP2_M/S 0 1 Slave Mode Master Mode Serial Port 2 Master/Slave Select 6.5.2 Serial Port 2 Speed Mode In Master Mode this bit configures the speed mode of Serial Port 2. SP2_SPEED 0 1 Single-Speed Mode (SSM) Double-Speed Mode (DSM) Serial Port 2 Speed Mode 6.5.3 MCLK2 Divider These bits configure the internal MCLK2 dividers. MCLK2 FREQ[1:0] 00 01 10 11 ÷1 ÷1.5 ÷2 ÷3 MCLK Divider 6.5.4 Serial Port 2 MCLK Source This bit selects which MCLK pin provides the clock for deriving Master Mode sub-clocks for Serial Port 2. SP2_MCLK 0 1 MCLK1 MCLK2 Serial Port 2 MCLK source 6.6 7 ADC Clocking (Address 06h) 6 ADC_MCLK 5 Reserved 4 ADC_SP 3 Reserved 2 Reserved 1 ADC_DIF1 0 ADC_DIF0 Reserved 6.6.1 ADC MCLK Source This bit selects which MCLK pin provides the clock for the ADC. ADC_MCLK 0 1 MCLK1 MCLK2 ADC MCLK source 50 DS721A6 CS42324 6.6.2 ADC Serial Port Source This bit selects which serial port provides the sub clocks for the ADC. ADC_SP 0 1 Serial Port 1 (SCLK1/LRCK1) Serial Port 2 (SCLK2/LRCK2) ADC sub clock source 6.6.3 ADC Digital Interface Format (ADC_DIF) These bits configure the serial audio interface format for transmitting digital audio data on SDOUT ADC_DIF[1:0] 00 01 10 11 Left-Justified, 24-bit data I²S, 24-bit data Reserved Reserved ADC Serial Audio Interface Format 6.7 7 DAC1 Clocking (Address 07h) 6 DAC1_MCLK 5 Reserved 4 DAC1_SP 3 Reserved 2 Reserved 1 DAC1_DIF1 0 DAC1_DIF0 Reserved 6.7.1 DAC1 MCLK Source This bit selects which MCLK pin provides the clock for DAC1. DAC1_MCLK 0 1 MCLK1 MCLK2 DAC1 MCLK source 6.7.2 DAC1 Serial Port Source This bit selects which serial port provides the sub clocks for the DAC1. DAC1_SP 0 1 Serial Port 1 (SCLK1/LRCK1) Serial Port 2 (SCLK2/LRCK2) DAC1 sub clock source 6.7.3 DAC1 Digital Interface Format (DAC1_DIF) These bits configure the serial audio interface format for incoming digital audio data on SDIN1. DAC1_DIF[1:0] 00 01 10 11 I²S, up to 24-bit data Right Justified, 16-bit data Right Justified, 24-bit data DAC1 Serial Audio Interface Format Left-Justified, up to 24-bit data DS721A6 51 CS42324 6.8 7 Reserved DAC2 Clocking (Address 08h) 6 DAC2_MCLK 5 Reserved 4 DAC2_SP 3 Reserved 2 Reserved 1 DAC2_DIF1 0 DAC2_DIF0 6.8.1 DAC2 MCLK Source This bit selects which MCLK pin provides the clock for DAC2. DAC2_MCLK 0 1 MCLK1 MCLK2 DAC2 MCLK source 6.8.2 DAC2 Serial Port Source This bit selects which serial port provides the sub clocks for the DAC2. DAC2_SP 0 1 Serial Port 1 (SCLK1/LRCK1) Serial Port 2 (SCLK2/LRCK2) DAC2 sub clock source 6.8.3 DAC2 Digital Interface Format (DAC2_DIF) These bits configure the serial audio interface format for incoming digital audio data on SDIN2. DAC2_DIF[1:0] 00 01 10 11 I²S, up to 24-bit data Right Justified, 16-bit data Right Justified, 24-bit data DAC2 Serial Audio Interface Format Left-Justified, up to 24-bit data 6.9 7 ADC Control (Address 0Ah) 6 ADC_HPFRZ 5 ADC_SOFT 4 Reserved 3 Reserved 2 AIN_SEL2 1 AIN_SEL1 0 AIN_SEL0 Reserved 6.9.1 ADC High-Pass Filter Freeze The high-pass filter works by continuously subtracting a measure of the DC offset from the output of the decimation filter. If the ADC_HPFRZ bit is taken high during normal operation, the current value of the DC offset is frozen and this DC offset will continue to be subtracted from the conversion result. For DC measurements, this bit must be set to ‘1’. ADC_HPFRZ 0 1 Continuous DC Subtraction Fixed DC Subtraction ADC High-Pass Filter Freeze 6.9.2 ADC Soft Ramp Control Soft Ramp allows level changes, both muting and attenuation, to be implemented by incrementally ramping, in 1/8 dB steps, from the current level to the new level at a rate of 1 dB per 8 left/right clock periods. 52 DS721A6 CS42324 ADC_SOFT 0 1 Off On ADC Soft Ramp Control 6.9.3 Analog Input Selection These bits are used to select the input source for the ADC. AIN_SEL[2:0] 000 001 010 011 100 101 110 111 Reserved Line-Level Input Pair 1 Line-Level Input Pair 2 Line-Level Input Pair 3 Line-Level Input Pair 4 Line-Level Input Pair 5 Reserved Reserved ADC Soft Ramp Control 6.10 7 DAC1 Control (Address 0Bh) 5 DAC1_SOFT 4 DAC1_ZC 3 DAC1_ LOOPBACK 2 DAC1_INV 1 DAC1_MIX1 0 DAC1_MIX0 6 DAC1_SNGV DAC1_DEPH OL 6.10.1 DAC1 De-Emphasis Control This bit enables the digital filter to apply the standard 15μs/50μs digital de-emphasis filter response for a sample rate (Fs) of 44.1 kHz. De-emphasis is available only in Single-Speed Mode. DAC1_DEPH 0 1 Off On (valid for Fs = 44.1 kHz) DAC1 De-Emphasis Control 6.10.2 DAC1 Single Volume Control The individual channel volume levels are independently controlled by their respective Volume Control registers when this function is disabled. When enabled, the volume on DAC1 channels is determined by the DAC1A Volume Control register and the DAC1B Volume Control register is ignored. DAC1_SNGVOL 0 1 Off On DAC1 Single Volume Control 6.10.3 DAC1 Soft Ramp Control Soft Ramp allows level changes, both muting and attenuation, to be implemented by incrementally ramping, in 1/8 dB steps, from the current level to the new level at a rate of 1 dB per 8 left/right clock periods. DAC1_SOFT 0 1 Off On DAC1 Soft Ramp Control DS721A6 53 CS42324 6.10.4 DAC1 Zero Cross Control Zero Cross Enable dictates that signal level changes, either by attenuation changes or muting, will occur on a signal zero crossing to minimize audible artifacts. The requested level change will occur after a timeout period between 512 and 1024 sample periods (10.7 ms to 21.3 ms at 48 kHz sample rate) if the signal does not encounter a zero crossing. The zero cross function is independently monitored and implemented for each channel. Soft Ramp and Zero Cross Enable Soft Ramp and Zero Cross Enable dictate that signal level changes, either by attenuation changes or muting, will occur in 1/8 dB steps and be implemented on a signal zero crossing. The 1/8 dB level change will occur after a time-out period between 512 and 1024 sample periods (10.7 ms to 21.3 ms at 48 kHz sample rate) if the signal does not encounter a zero crossing. The zero cross function is independently monitored and implemented for each channel. DAC1_SOFT 0 0 1 1 0 1 0 1 DAC1_ZC Mode Changes to affect immediately Zero Cross enabled Soft Ramp enabled Soft Ramp and Zero Cross enabled 6.10.5 DAC1 Loop-Back Loops ADC SDOUT, SCLK, and LRCK to DAC1 serial port pins. DAC1_LOOP_ BACK 0 1 Off On DAC1 Loop-Back 6.10.6 DAC1 Invert Signal Polarity When enabled, this bit will effect a 180 degree phase shift in the DAC1 channels. DAC1_INV 0 1 Off On DAC1 Invert Signal Polarity 6.10.7 DAC1 Channel Mixer These bits implement mono mixes of the left and right channels as well as a left/right channel swap. DAC1_MIX[1:0] 00 01 10 11 L L+R ---------2 DAC1 OUTA R L+R ---------2 DAC1 OUTB R L 54 DS721A6 CS42324 6.11 7 DAC2_DEPH DAC2 Control (Address 0Ch) 6 DAC2_ SNGVOL 5 DAC2_SOFT 4 DAC2_ZC 3 DAC2_ LOOP_BACK 2 DAC2_INV 1 DAC2_MIX1 0 DAC2_MIX0 6.11.1 DAC2 De-Emphasis Control This bit enables the digital filter to apply the standard 15μs/50μs digital de-emphasis filter response for a sample rate (Fs) of 44.1 kHz. De-emphasis is available only in Single-Speed Mode. DAC2_DEPH 0 1 Off On (valid for Fs = 44.1 kHz) DAC2 De-Emphasis Control 6.11.2 DAC2 Single Volume Control The individual channel volume levels are independently controlled by their respective Volume Control registers when this function is disabled. When enabled, the volume on DAC2 channels is determined by the DAC2A Volume Control register and the DAC2B Volume Control register is ignored. DAC2_SNGVOL 0 1 Off On DAC2 Single Volume Control 6.11.3 DAC2 Soft Ramp Control Soft Ramp allows level changes, both muting and attenuation, to be implemented by incrementally ramping, in 1/8 dB steps, from the current level to the new level at a rate of 1 dB per 8 left/right clock periods. DAC2_SOFT 0 1 Off On DAC2 Soft Ramp Control 6.11.4 DAC2 Zero Cross Control Zero Cross Enable dictates that signal level changes, either by attenuation changes or muting, will occur on a signal zero crossing to minimize audible artifacts. The requested level change will occur after a timeout period between 512 and 1024 sample periods (10.7 ms to 21.3 ms at 48 kHz sample rate) if the signal does not encounter a zero crossing. The zero cross function is independently monitored and implemented for each channel. Soft Ramp and Zero Cross Enable Soft Ramp and Zero Cross Enable dictate that signal level changes, either by attenuation changes or muting, will occur in 1/8 dB steps and be implemented on a signal zero crossing. The 1/8 dB level change will occur after a time-out period between 512 and 1024 sample periods (10.7 ms to 21.3 ms at 48 kHz sample rate) if the signal does not encounter a zero crossing. The zero cross function is independently monitored and implemented for each channel. DAC2_SOFT 0 0 1 1 0 1 0 1 DAC2_ZC Mode Changes to affect immediately Zero Cross enabled Soft Ramp enabled Soft Ramp and Zero Cross enabled DS721A6 55 CS42324 6.11.5 DAC2 Loop-Back Loops ADC SDOUT, SCLK, and LRCK to DAC1 serial port pins. DAC2_LOOP_ BACK 0 1 Off On DAC2 Loop-Back 6.11.6 DAC2 Invert Signal Polarity When enabled, this bit will effect a 180 degree phase shift in the DAC2 channels. DAC2_INV 0 1 Off On DAC2 Invert Signal Polarity 6.11.7 DAC2 Channel Mixer These bits implements mono mixes of the left and right channels as well as a left/right channel swap. DAC2_MIX[1:0] 00 01 10 11 DAC2 OUTA L L+R ---------2 R DAC2 OUTB R L+R ---------2 L 6.12 AOUT1 Control (Address 0Dh) 6 Reserved 5 Reserved 4 Reserved 3 MUTEC1 2 1 0 AOUT1_SEL2 AOUT1_SEL1 AOUT1_SEL0 7 Reserved 6.12.1 External Mute Control Pin This bit controls the logic state of the corresponding MUTEC1 pin. Though this bit is active high, it should be noted that the MUTEC1 pin is active low. MUTEC1 0 1 High (Mute Disengaged) Low (Mute Engaged) Output on MUTEC1 pin 6.12.2 AOUT1 Select These bits are used to select the analog output source. AOUT1_SEL[2:0] 000 001 010 011 100 101 110 111 Reserved AIN Pair 1 AIN Pair 2 AIN Pair 3 AIN Pair 4 AIN Pair 5 DAC1 Output Pair DAC2 Output Pair AOUT1 Source 56 DS721A6 CS42324 6.13 AOUT2 Control (Address 0Eh) 6 Reserved 5 Reserved 4 Reserved 3 MUTEC2 2 1 0 AOUT2_SEL2 AOUT2_SEL1 AOUT2_SEL0 7 Reserved 6.13.1 External Mute Control Pin This bit controls the logic state of the corresponding MUTEC2 pin. Though this bit is active high, it should be noted that the MUTEC2 pin is active low. MUTEC2 0 1 High (Mute Disengaged) Low (Mute Engaged) Output on MUTEC2 pin 6.13.2 AOUT2 Select These bits are used to select the analog output source. AOUT2_SEL[2:0] 000 001 010 011 100 101 110 111 Reserved AIN Pair 1 AIN Pair 2 AIN Pair 3 AIN Pair 4 AIN Pair 5 DAC1 Output Pair DAC2 Output Pair AOUT2 Source 6.14 AOUT3 Control (Address 0Fh) 6 Reserved 5 Reserved 4 Reserved 3 MUTEC3 2 1 0 AOUT3_SEL2 AOUT3_SEL1 AOUT3_SEL0 7 Reserved 6.14.1 External Mute Control Pin This bit controls the logic state of the corresponding MUTEC3 pin. Though this bit is active high, it should be noted that the MUTEC3 pin is active low. MUTEC3 0 1 High (Mute Disengaged) Low (Mute Engaged) Output on MUTEC3 pin DS721A6 57 CS42324 6.14.2 AOUT3 Select These bits are used to select the analog output source. AOUT3_SEL[2:0] 000 001 010 011 100 101 110 111 Reserved AIN Pair 1 AIN Pair 2 AIN Pair 3 AIN Pair 4 AIN Pair 5 DAC1 Output Pair DAC2 Output Pair AOUT3 Source 6.15 ADCx Volume Control: ADCA (Address 10h) & ADCB (Address 11h) 6 ADCx_VOL6 5 ADCx_VOL5 4 ADCx_VOL4 3 ADCx_VOL3 2 ADCx_VOL2 1 ADCx_VOL1 0 ADCx_VOL0 7 ADCx_VOL7 The level for each channel of the ADC can be adjusted in 0.5 dB increments as dictated by the ADC Soft and Zero Cross bits (ADC_SOFT) from +12 to -84 dB. Levels are decoded in two’s complement, as shown in the table below. Binary Code 0001 1000 ··· 0000 0000 1111 1111 1111 1110 ··· 0101 1000 All other values Volume Setting +12.0 dB ··· 0.0 dB -0.5 dB -1.0 dB ··· -84.0 dB Reserved 6.16 DAC1x Volume Control: DAC1A (Address 12h) & DAC1B (Address 13h) 7 6 5 4 3 2 1 0 DAC1x_VOL7 DAC1x_VOL6 DAC1x_VOL5 DAC1x_VOL4 DAC1x_VOL3 DAC1x_VOL2 DAC1x_VOL1 DAC1x_VOL0 The level for each channel of DAC1 output can be adjusted in 0.5 dB increments as dictated by the DAC1 Soft and Zero Cross bits (DAC1_SOFT & DAC1_ZC) from 0 to -127.5 dB. Levels are decoded as unsigned, as shown in the table below. Binary Code 0000 0000 0000 0001 0000 0010 ··· 1111 1111 Volume Setting 0 dB -0.5 dB -1.0 dB ··· -127.5 dB 58 DS721A6 CS42324 6.17 DAC2x Volume Control: DAC1A (Address 14h) & DAC1B (Address 15h) 7 6 5 4 3 2 1 0 DAC2x_VOL7 DAC2x_VOL6 DAC2x_VOL5 DAC2x_VOL4 DAC2x_VOL3 DAC2x_VOL2 DAC2x_VOL1 DAC2x_VOL0 The level for each channel of DAC2 output can be adjusted in 0.5 dB increments as dictated by the DAC2 Soft and Zero Cross bits (DAC2_SOFT & DAC2_ZC) from 0 to -127.5 dB. Levels are decoded in unsigned, as shown in the table below. Binary Code 0000 0000 0000 0001 0000 0010 ··· 1111 1111 Volume Setting 0 dB -0.5 dB -1.0 dB ··· -127.5 dB 6.18 Interrupt Mode (Address 16h) 6 SP2_ CLKERR0 5 SP1_ CLKERR1 4 SP1_ CLKERR0 3 2 DAC_AMUTE1 DAC_AMUTE0 1 ADC_ OVFLx1 0 ADC_ OVFLx0 7 SP2_ CLKERR1 The Interrupt Mode register contains four two-bit codes which correspond to either an Interrupt Status bit or group of bits as shown below. There are three ways to set the INT pin active in accordance with the interrupt condition. In the Rising-edge Active Mode, the INT pin becomes active on the arrival of the interrupt condition. In the Falling-edge Active Mode, the INT pin becomes active on the removal of the interrupt condition. In Level Active Mode, the INT pin remains active during the interrupt condition . Interrupt Mode SP2_CLKERR[1:0] SP1_CLKERR[1:0] DAC_AMUTE[1:0] ADC_AVFLx[1:0] Bit Settings 00 01 10 11 Associated Interrupt Status Bit(s) SP2_CLKERR SP1_CLKERR DAC2_AMUTEL, DAC2_AMUTER, DAC1_AMUTEL, DAC1_AMUTER ADC_OVFLP, ADC_OVFLN Interrupt Mode Setting Rising-edge Active Falling-edge Active Level Active Reserved 6.19 Interrupt Mask (Address 17h) 6 DAC2_ AMUTERM 5 DAC1_ AMUTELM 4 DAC1_ AMUTERM 3 SP2_ CLKERRM 2 SP1_ CLKERRM 1 ADC_ OVFLPM 0 ADC_ OVFLNM 7 DAC2_ AMUTELM These bits are mask bits for the corresponding bits in the “Interrupt Status (Address 18h) (Read Only)” register on page 61. Bit Settings 0 1 Bit in Interrupt Register Not Masked Masked DS721A6 59 CS42324 6.19.1 DAC2 Auto Mute Left Mask (DAC2_AMUTELM) This bit serves as a mask for the DAC2 Auto Mute Left interrupt source. If this bit is cleared, the DAC2_AMUTEL interrupt is unmasked, meaning that if the DAC2_AMUTEL condition occurs, the INT pin will go active according to the DAC_AMUTE[1:0] bits in the “Interrupt Mode (Address 16h)” register on page 59. If the DAC2_AMUTELM bit is set, the DAC2_AMUTEL condition is masked, meaning that its occurrence will not affect the INT pin. 6.19.2 DAC2 Auto Mute Right Mask (DAC2_AMUTERM) This bit serves as a mask for the DAC2 Auto Mute Left interrupt source. If this bit is cleared, the DAC2_AMUTER interrupt is unmasked, meaning that if the DAC2_AMUTER condition occurs, the INT pin will go active according to the DAC_AMUTE[1:0] bits in the “Interrupt Mode (Address 16h)” register on page 59. If the DAC2_AMUTERM bit is set, the DAC2_AMUTER condition is masked, meaning that its occurrence will not affect the INT pin. 6.19.3 DAC1 Auto Mute Left Mask (DAC1_AMUTELM) This bit serves as a mask for the DAC1 Auto Mute Left interrupt source. If this bit is cleared, the DAC1_AMUTEL interrupt is unmasked, meaning that if the DAC1_AMUTEL condition occurs, the INT pin will go active according to the DAC_AMUTE[1:0] bits in the “Interrupt Mode (Address 16h)” register on page 59. If the DAC1_AMUTELM bit is set, the DAC1_AMUTEL condition is masked, meaning that its occurrence will not affect the INT pin. 6.19.4 DAC1 Auto Mute Right Mask (DAC1_AMUTELM) This bit serves as a mask for the DAC1 Auto Mute Left interrupt source. If this bit is cleared, the DAC1_AMUTER interrupt is unmasked, meaning that if the DAC1_AMUTER condition occurs, the INT pin will go active according to the DAC_AMUTE[1:0] bits in the “Interrupt Mode (Address 16h)” register on page 59. If the DAC1_AMUTERM bit is set, the DAC1_AMUTER condition is masked, meaning that its occurrence will not affect the INT pin. 6.19.5 Serial Port 2 Clock Error Mask (SP2_CLKERRM) This bit serves as a mask for the serial port 2 clock error interrupt source. If this bit is cleared, the SP2_CLKERR interrupt is unmasked, meaning that if the SP2_CLKERR bit is set, the INT pin will go active according to the SP2_CLKERR[1:0] bits in the “Interrupt Mode (Address 16h)” register on page 59. If the SP2_CLKERRM bit is set, the SP2_CLKERR condition is masked, meaning that its occurrence will not affect the INT pin. 6.19.6 Serial Port 1 Clock Error Mask (SP1_CLKERRM) This bit serves as a mask for the serial port 1 clock error interrupt source. If this bit is cleared, the SP1_CLKERR interrupt is unmasked, meaning that if the SP1_CLKERR bit is set, the INT pin will go active according to the SP1_CLKERR[1:0] bits in the “Interrupt Mode (Address 16h)” register on page 59. If the SP1_CLKERRM bit is set, the SP1_CLKERR condition is masked, meaning that its occurrence will not affect the INT pin. 60 DS721A6 CS42324 6.19.7 ADC Positive Overflow Mask (ADC_OVFLPM) This bit serves as a mask for the ADC positive overflow interrupt source. If this bit is cleared, the ADC_OVFLP interrupt is unmasked, meaning that if the ADC_OVFLP conditions are met in the interrupt status register, the INT pin will go active according to the ADC_OVFLx[1:0] bits in the “Interrupt Mode (Address 16h)” register on page 59. If the ADC_OVFLPM bit is set, the ADC_OVFLP condition is masked, meaning that its occurrence will not affect the INT pin. However, the OVFL pin will continue to reflect the overflow state of the ADC. 6.19.8 ADC Negative Overflow Mask (ADC_OVFLNM) This bit serves as a mask for the ADC negative overflow interrupt source. If this bit is cleared, the ADC_OVFLN interrupt is unmasked, meaning that if the ADC_OVFLN conditions are met in the interrupt status register, the INT pin will go active according to the ADC_OVFLx[1:0] bits in the “Interrupt Mode (Address 16h)” register on page 59. If the ADC_OVFLNM bit is set, the ADC_OVFLN condition is masked, meaning that its occurrence will not affect the INT pin. However, the OVFL pin will continue to reflect the overflow state of the ADC. 6.20 Interrupt Status (Address 18h) (Read Only) 6 DAC2_ AMUTER 5 DAC1_ AMUTEL 4 DAC1_ AMUTER 3 SP2_ CLKERR 2 SP1_ CLKERR 1 ADC_ OVFLP 0 ADC_ OVFLN 7 DAC2_ AMUTEL This register defaults to 00h and is read only. If the INT pin is active, reading this register clears the interrupt condition. Bit Settings 0 1 Bit in Interrupt Register Interrupt has not occurred since the last read of this register. Interrupt has occurred since the last read of this register. 6.20.1 DAC2 Auto Mute Left Interrupt Status (DAC2_AMUTEL) This bit is read only. When set, indicates that DAC2 left channel has had an auto-mute condition since the last read of this register. Conditions which cause an auto-mute, such as receiving 4096 consecutive samples of zeroes or ones on the left channel of SDIN2, will cause this bit to be set. This interrupt status bit is an edge-triggered event and will be cleared following a read of this register. The INT pin will go active according to the DAC_AMUTE[1:0] bits in the “Interrupt Mode (Address 16h)” on page 59 and the status of this bit if DAC2_AMUTELM bit is cleared. 6.20.2 DAC2 Auto Mute Right Interrupt Status (DAC2_AMUTER) This bit is read only. When set, indicates that DAC2 right channel has had an auto-mute condition since the last read of this register. Conditions which cause an auto-mute, such as receiving 4096 consecutive samples of zeroes or ones on the right channel of SDIN2, will cause this bit to be set. This interrupt status bit is an edge-triggered event and will be cleared following a read of this register. The INT pin will go active according to the DAC_AMUTE[1:0] bits in the “Interrupt Mode (Address 16h)” on page 59 and the status of this bit if DAC2_AMUTERM bit is cleared. DS721A6 61 CS42324 6.20.3 DAC1 Auto Mute Left Interrupt Status (DAC1_AMUTEL) This bit is read only. When set, indicates that DAC1 left channel has had an auto-mute condition since the last read of this register. Conditions which cause an auto-mute, such as receiving 4096 consecutive samples of zeroes or ones on the left channel of SDIN1, will cause this bit to be set. This interrupt status bit is an edge-triggered event and will be cleared following a read of this register. The INT pin will go active according to the DAC_AMUTE[1:0] bits in the “Interrupt Mode (Address 16h)” on page 59 and the status of this bit if DAC1_AMUTELM bit is cleared. 6.20.4 DAC1 Auto Mute Right Interrupt Status (DAC1_AMUTEL) This bit is read only. When set, indicates that DAC1 right channel has had an auto-mute condition since the last read of this register. Conditions which cause an auto-mute, such as receiving 4096 consecutive samples of zeroes or ones on the right channel of SDIN1, will cause this bit to be set. This interrupt status bit is an edge-triggered event and will be cleared following a read of this register. The INT pin will go active according to the DAC_AMUTE[1:0] bits in the “Interrupt Mode (Address 16h)” on page 59 and the status of this bit if DAC1_AMUTERM bit is cleared. 6.20.5 Serial Port 2 Clock Error Interrupt Status (SP2_CLKERR) This bit is read only. When set, indicates that Serial Port 2 has had a clock error since the last read of this register. Conditions which cause a clock error in the serial port, such as loss of LRCK2, SCLK2, an MCLKx/LRCK2 ratio change, or speed mode change, will cause this bit to be set. This interrupt bit is an edge-triggered event and will be cleared following a read of this register. The INT pin will go active according to the SP2_CLKERR[1:0] bits in the “Interrupt Mode (Address 16h)” on page 59 and the status of this bit if SP2_CLKERRM bit is cleared. 6.20.6 Serial Port 1 Clock Error Interrupt Status (SP1_CLKERR) This bit is read only. When set, indicates that Serial Port 1 has had a clock error since the last read of this register. Conditions which cause a clock error in the serial port, such as loss of LRCK1, SCLK1, an MCLKx/LRCK1 ratio change, or speed mode change, will cause this bit to be set. This interrupt bit is an edge-triggered event and will be cleared following a read of this register. The INT pin will go active according to the SP1_CLKERR[1:0] bits in the “Interrupt Mode (Address 16h)” on page 59 and the status of this bit if SP1_CLKERRM bit is cleared. 6.20.7 ADC Positive Overflow Interrupt Bit (ADC_OVFLP) This bit is read only. When set, indicates that a positive over-range condition occurred anywhere in the CS42324 ADC signal path and has ADC data has been clipped to positive full scale since the last read of this register. This interrupt bit is an edge-triggered event and will be cleared following a read of this register. The INT pin will go active according to the ADC_OVFLx[1:0] bits in the “Interrupt Mode (Address 16h)” on page 59 and the status of this bit if ADC_OVFLPM bit is cleared. To determine the current overflow state of the ADC use the OVFL pin. 62 DS721A6 CS42324 6.20.8 ADC Negative Overflow Interrupt Bit (ADC_OVFLN) This bit is read only. When set, indicates that a negative over-range condition occurred anywhere in the CS42324 ADC signal path and has ADC data has been clipped to negative full scale since the last read of this register. This interrupt bit is an edge-triggered event and will be cleared following a read of this register. The INT pin will go active according to the ADC_OVFLx[1:0] bits in the “Interrupt Mode (Address 16h)” on page 59 and the status of this bit if ADC_OVFLNM bit is cleared. To determine the current overflow state of the ADC use the OVFL pin. DS721A6 63 CS42324 7. GROUNDING AND POWER SUPPLY DECOUPLING As with any high-resolution converter, the CS42324 requires careful attention to power supply and grounding arrangements if its potential performance is to be realized. Figure 7 on page 26 shows the recommended power arrangements, with VA connected to a clean supply. VD, which powers the digital filter, may be run from the system logic supply (VL) or may be powered from the analog supply (VA) via a resistor. In this case, no additional devices should be powered from VD. Power supply decoupling capacitors should be as near to the CS42324 as possible, with the low value ceramic capacitor being the nearest. All signals, especially clocks, should be kept away from the FILT+, VCM_ADC, VBIAS, VCMBUF, and VCMDAC pins in order to avoid unwanted coupling into the modulators. The FILT+, VCM_ADC, VBIAS, VCMBUF, and VCMDAC decoupling capacitors, particularly the 0.1 µF, must be positioned to minimize the electrical path from each pin to GND. The CS42324 evaluation board demonstrates the optimum layout and power supply arrangements. To minimize digital noise, connect the CS42324 digital outputs only to CMOS inputs. 64 DS721A6 CS42324 8. ADC FILTER PLOTS 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 0.40 0.42 0.44 Amplitude (dB) Amplitude (dB) 0.46 0.48 0.50 0.52 0.54 0.56 0.58 0.60 Frequency (norm alized to Fs) Frequency (norm alized to Fs) Figure 23. Single-Speed Mode Stopband Rejection Figure 24. Single-Speed Mode Transition Band 0 -1 -2 0.10 0.08 0.06 Amplitude (dB) -3 -4 -5 -6 -7 -8 -9 -10 0.46 0.47 0.48 0.49 0.50 0.51 0.52 Amplitude (dB) 0.04 0.02 0.00 -0.02 -0.04 -0.06 -0.08 -0.10 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 Frequency (norm alized to Fs) Frequency (norm alized to Fs) Figure 25. Single-Speed Mode Transition Band (Detail) Figure 26. Single-Speed Mode Passband Ripple 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 0.40 0.42 0.44 Amplitude (dB) Amplitude (dB) 0.46 0.48 0.50 0.52 0.54 0.56 0.58 0.60 Frequency (norm alized to Fs) Frequency (norm alized to Fs) Figure 27. Double-Speed Mode Stopband Rejection Figure 28. Double-Speed Mode Transition Band DS721A6 65 CS42324 0 -1 -2 0.10 0.08 0.06 Amplitude (dB) -3 -4 -5 -6 -7 -8 -9 -10 0.46 0.47 0.48 0.49 0.50 0.51 0.52 Amplitude (dB) 0.04 0.02 0.00 -0.02 -0.04 -0.06 -0.08 -0.10 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 Frequency (norm alized to Fs) Frequency (norm alized to Fs) Figure 29. Double-Speed Mode Transition Band (Detail) Figure 30. Double-Speed Mode Passband Ripple 66 DS721A6 CS42324 9. DAC DIGITAL FILTER RESPONSE PLOTS 0 0 −20 −20 Amplitude (dB) Amplitude (dB) −40 −40 −60 −60 −80 −80 −100 −100 −120 0.4 0.5 0.6 0.7 0.8 Frequency(normalized to Fs) 0.9 1 −120 0.4 0.42 0.44 0.46 0.48 0.5 0.52 Frequency(normalized to Fs) 0.54 0.56 0.58 0.6 Figure 31. Single-Speed Stopband Rejection 0 0.02 Figure 32. Single-Speed Transition Band −1 0.015 −2 0.01 −3 0.005 Amplitude (dB) Amplitude (dB) −4 −5 0 −6 −0.005 −7 −0.01 −8 −0.015 −9 −10 0.45 0.46 0.47 0.48 0.49 0.5 0.51 Frequency(normalized to Fs) 0.52 0.53 0.54 0.55 −0.02 0 0.05 0.1 0.15 0.2 0.25 0.3 Frequency(normalized to Fs) 0.35 0.4 0.45 0.5 Figure 33. Single-Speed Transition Band (detail) Figure 34. Single-Speed Passband Ripple 0 0 20 20 Amplitude (dB) Amplitude (dB) 40 40 60 60 80 80 100 100 120 120 0.4 0.5 0.6 0.7 0.8 Frequency(normalized to Fs) 0.9 1 0.4 0.42 0.44 0.46 0.48 0.5 0.52 Frequency(normalized to Fs) 0.54 0.56 0.58 0.6 Figure 35. Double-Speed Stopband Rejection Figure 36. Double-Speed Transition Band DS721A6 67 CS42324 0 0.02 1 0.015 2 0.01 3 Amplitude (dB) 5 Amplitude (dB) 4 0.005 0 6 0.005 7 0.01 8 9 0.015 10 0.45 0.46 0.47 0.48 0.49 0.5 0.51 Frequency(normalized to Fs) 0.52 0.53 0.54 0.55 0.02 0 0.05 0.1 0.15 0.2 0.25 0.3 Frequency(normalized to Fs) 0.35 0.4 0.45 0.5 Figure 37. Double-Speed Transition Band (detail) Figure 38. Double-Speed Passband Ripple 0 0 20 20 40 Amplitude (dB) Amplitude (dB) 40 60 60 80 80 100 100 120 120 0.2 0.3 0.4 0.5 0.6 0.7 Frequency(normalized to Fs) 0.8 0.9 1 0.2 0.3 0.4 0.5 0.6 Frequency(normalized to Fs) 0.7 0.8 Figure 39. Quad-Speed Stopband Rejection 0 0.2 Figure 40. Quad-Speed Transition Band 1 0.15 2 0.1 3 0.05 Amplitude (dB) Amplitude (dB) 0.05 0.1 0.15 0.2 4 5 0 6 7 8 9 10 0.45 0.46 0.47 0.48 0.49 0.5 0.51 Frequency(normalized to Fs) 0.52 0.53 0.54 0.55 0 0.05 0.1 0.15 Frequency(normalized to Fs) 0.2 0.25 Figure 41. Quad-Speed Transition Band (detail) Figure 42. Quad-Speed Passband Ripple 68 DS721A6 CS42324 10.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 bandwidth 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 bandwidth (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 channels. 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 channels. 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. DS721A6 69 CS42324 11.PACKAGE DIMENSIONS 48L LQFP PACKAGE DRAWING E E1 D D1 1 e ∝ B A A1 L DIM MIN A --A1 0.002 B 0.007 D 0.343 D1 0.272 E 0.343 E1 0.272 e* 0.016 L 0.018 µ 0.000° * Nominal pin pitch is 0.50 mm INCHES NOM MAX MIN 0.055 0.063 --0.004 0.006 0.05 0.009 0.011 0.17 0.354 0.366 8.70 0.28 0.280 6.90 0.354 0.366 8.70 0.28 0.280 6.90 0.020 0.024 0.40 0.24 0.030 0.45 4° 7.000° 0.00° *Controlling dimension is mm. MILLIMETERS NOM MAX 1.40 1.60 0.10 0.15 0.22 0.27 9.0 BSC 9.30 7.0 BSC 7.10 9.0 BSC 9.30 7.0 BSC 7.10 0.50 BSC 0.60 0.60 0.75 4° 7.00° *JEDEC Designation: MS022 THERMAL CHARACTERISTICS AND SPECIFICATIONS Parameters Package Thermal Resistance multi-layer dual-layer Symbol θJA θJA θJC Min Typ 48 65 15 Max Units °C/Watt °C/Watt °C/Watt 70 DS721A6 CS42324 12.ORDERING INFORMATION Description Package 2-In, 4-Out Audio CS42324 CODEC with 2Vrms LQFP Analog I/O 2-In, 4-Out Audio CS42324 CODEC with 2Vrms LQFP Analog I/O CDB42324 Evaluation Board Product Pb-Free Yes Grade Temp Range Container Tray Order # CS42324-CQZ Commercial -40°C to +85° C Yes - Automotive -40°C to +105° C - Tray - CS42324-DQZ CDB42324 13.REVISION HISTORY Release A5 A6 Changes Changed Title Corrected SCL/CCLK pin description (Pin 2) in the Pin Description table on page 8. Contacting Cirrus Logic Support For all product questions and inquiries, contact a Cirrus Logic Sales Representative. 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