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WM8918 Production Data
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PD, Rev 4.1, January 2012
4
MICBIAS CURRENT DETECT ...................................................................................................................................... 36
MICBIAS CURRENT DETECT FILTERING .................................................................................................................. 37
MICROPHONE HOOK SWITCH DETECTION .............................................................................................................. 39
DIGITAL MICROPHONE INTERFACE .......................................................................... 40
DIGITAL MICROPHONE VOLUME CONTROL ............................................................................................................. 42
HIGH PASS FILTER ...................................................................................................................................................... 44
DYNAMIC RANGE CONTROL (DRC) ........................................................................... 45
COMPRESSION/LIMITING CAPABILITIES .................................................................................................................. 45
GAIN LIMITS .................................................................................................................................................................. 47
DYNAMIC CHARACTERISTICS ................................................................................................................................... 47
ANTI-CLIP CONTROL ................................................................................................................................................... 48
QUICK RELEASE CONTROL ....................................................................................................................................... 49
GAIN SMOOTHING ....................................................................................................................................................... 49
INITIALISATION ............................................................................................................................................................ 50
RETUNETM MOBILE PARAMETRIC EQUALIZER (EQ) ................................................ 51
DEFAULT MODE (5-BAND PARAMETRIC EQ) ........................................................................................................... 51
RETUNETM MOBILE MODE ........................................................................................................................................... 52
EQ FILTER CHARACTERISTICS ................................................................................................................................. 52
DIGITAL MIXING ........................................................................................................... 54
DIGITAL MIXING PATHS .............................................................................................................................................. 54
DAC INTERFACE VOLUME BOOST ............................................................................................................................ 56
DIGITAL SIDETONE ...................................................................................................................................................... 56
DIGITAL-TO-ANALOGUE CONVERTER (DAC) ........................................................... 58
DAC DIGITAL VOLUME CONTROL .............................................................................................................................. 58
DAC SOFT MUTE AND SOFT UN-MUTE ..................................................................................................................... 60
DAC MONO MIX ............................................................................................................................................................ 61
DAC DE-EMPHASIS ...................................................................................................................................................... 61
DAC SLOPING STOPBAND FILTER ............................................................................................................................ 62
DAC OVERSAMPLING RATIO (OSR) .......................................................................................................................... 62
OUTPUT SIGNAL PATH ............................................................................................... 63
OUTPUT SIGNAL PATHS ENABLE .............................................................................................................................. 64
HEADPHONE / LINE OUTPUT SIGNAL PATHS ENABLE ........................................................................................... 64
OUTPUT MUX CONTROL ............................................................................................................................................. 69
OUTPUT VOLUME CONTROL...................................................................................................................................... 69
ANALOGUE OUTPUTS ................................................................................................. 72
HEADPHONE OUTPUTS – HPOUTL AND HPOUTR ................................................................................................... 72
LINE OUTPUTS – LINEOUTL AND LINEOUTR............................................................................................................ 72
EXTERNAL COMPONENTS FOR GROUND REFERENCED OUTPUTS .................................................................... 73
REFERENCE VOLTAGES AND MASTER BIAS ........................................................... 74
POP SUPPRESSION CONTROL .................................................................................. 75
DISABLED INPUT CONTROL ....................................................................................................................................... 75
CHARGE PUMP ............................................................................................................ 76
DC SERVO .................................................................................................................... 77
DC SERVO ENABLE AND START-UP ......................................................................................................................... 77
DC SERVO ACTIVE MODES ........................................................................................................................................ 80
DC SERVO READBACK ............................................................................................................................................... 82
DIGITAL AUDIO INTERFACE ....................................................................................... 82
MASTER AND SLAVE MODE OPERATION ................................................................................................................. 83
OPERATION WITH TDM ............................................................................................................................................... 83
BCLK FREQUENCY ...................................................................................................................................................... 84
AUDIO DATA FORMATS (NORMAL MODE) ................................................................................................................ 84
AUDIO DATA FORMATS (TDM MODE)........................................................................................................................ 87
DIGITAL AUDIO INTERFACE CONTROL..................................................................... 89
AUDIO INTERFACE OUTPUT TRI-STATE ................................................................................................................... 90