WM8903
Production Data
MICROPHONE HOOK SWITCH DETECTION................................................................................................................ 39
DIGITAL MICROPHONE INTERFACE .......................................................................... 40
ANALOGUE-TO-DIGITAL CONVERTER (ADC)............................................................ 42
ADC DIGITAL VOLUME CONTROL................................................................................................................................ 42
HIGH-PASS FILTER (HPF) ............................................................................................................................................. 45
ADC OVERSAMPLING RATIO (OSR) ............................................................................................................................ 46
DYNAMIC RANGE CONTROL (DRC) ........................................................................... 46
COMPRESSION/LIMITING CAPABILITIES .................................................................................................................... 46
GAIN LIMITS.................................................................................................................................................................... 48
DYNAMIC CHARACTERISTICS ..................................................................................................................................... 49
ANTI-CLIP CONTROL..................................................................................................................................................... 50
QUICK RELEASE CONTROL ......................................................................................................................................... 50
GAIN SMOOTHING......................................................................................................................................................... 51
INITIALISATION .............................................................................................................................................................. 52
DIGITAL MIXING............................................................................................................ 53
DIGITAL MIXING PATHS ................................................................................................................................................ 53
DAC INTERFACE VOLUME BOOST .............................................................................................................................. 54
DIGITAL SIDETONE........................................................................................................................................................ 55
DIGITAL-TO-ANALOGUE CONVERTER (DAC)............................................................ 56
DAC DIGITAL VOLUME CONTROL................................................................................................................................ 57
DAC SOFT MUTE AND SOFT UN-MUTE....................................................................................................................... 59
DAC MONO MIX.............................................................................................................................................................. 60
DAC DE-EMPHASIS........................................................................................................................................................ 60
DAC SLOPING STOPBAND FILTER .............................................................................................................................. 61
DAC BIAS CONTROL...................................................................................................................................................... 61
DAC OVERSAMPLING RATIO (OSR) ............................................................................................................................ 62
OUTPUT SIGNAL PATH................................................................................................ 63
OUTPUT SIGNAL PATHS ENABLE................................................................................................................................ 64
HEADPHONE / LINE OUTPUT SIGNAL PATHS ENABLE............................................................................................. 65
OUTPUT PGA BIAS CONTROL...................................................................................................................................... 68
OUTPUT DRIVERS BIAS CONTROL ............................................................................................................................. 68
OUTPUT MIXER CONTROL ........................................................................................................................................... 69
OUTPUT VOLUME CONTROL ....................................................................................................................................... 71
ANALOGUE OUTPUTS ................................................................................................. 75
HEADPHONE OUTPUTS – HPOUTL AND HPOUTR..................................................................................................... 75
LINE OUTPUTS – LINEOUTL AND LINEOUTR ............................................................................................................. 75
DIFFERENTIAL LINE OUTPUTS – LON/LOP AND RON/ROP ...................................................................................... 75
EXTERNAL COMPONENTS FOR GROUND-REFERENCED OUTPUTS...................................................................... 76
REFERENCE VOLTAGES AND MASTER BIAS ........................................................... 77
POP SUPPRESSION CONTROL .................................................................................. 79
DISABLED INPUT / OUTPUT CONTROL....................................................................................................................... 79
DIFFERENTIAL LINE OUTPUT DISCHARGE CONTROL.............................................................................................. 79
CHARGE PUMP............................................................................................................. 80
DC SERVO.....................................................................................................................81
DIGITAL AUDIO INTERFACE........................................................................................ 84
MASTER AND SLAVE MODE OPERATION................................................................................................................... 84
OPERATION WITH TDM................................................................................................................................................. 85
BCLK FREQUENCY........................................................................................................................................................ 86
AUDIO DATA FORMATS (NORMAL MODE).................................................................................................................. 86
AUDIO DATA FORMATS (TDM MODE) ......................................................................................................................... 88
DIGITAL AUDIO INTERFACE CONTROL ..................................................................... 90
BCLK AND LRCLK CONTROL........................................................................................................................................ 91
COMPANDING ................................................................................................................................................................ 93
LOOPBACK ..................................................................................................................................................................... 94
PD, Rev 4.5, June 2012
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
