DIFFERENTIAL LINE INPUT ......................................................................................................................................... 31
INPUT PGA GAIN CONTROL ....................................................................................................................................... 32
INPUT PGA COMMON MODE AMPLIFIER .................................................................................................................. 34
MICBIAS CONTROL ...................................................................................................................................................... 35
w
PD, Rev 4.1, January 2012
3
WM8918
Production Data
MICBIAS CURRENT DETECT ...................................................................................................................................... 36
MICBIAS CURRENT DETECT FILTERING .................................................................................................................. 37
DIGITAL MICROPHONE INTERFACE .......................................................................... 40
DIGITAL MICROPHONE VOLUME CONTROL............................................................................................................. 42
HIGH PASS FILTER ...................................................................................................................................................... 44
DYNAMIC RANGE CONTROL (DRC) ........................................................................... 45
GAIN LIMITS .................................................................................................................................................................. 47
ANTI-CLIP CONTROL ................................................................................................................................................... 48
QUICK RELEASE CONTROL ....................................................................................................................................... 49
GAIN SMOOTHING ....................................................................................................................................................... 49
RETUNE MOBILE MODE........................................................................................................................................... 52
DIGITAL MIXING ........................................................................................................... 54
DIGITAL MIXING PATHS .............................................................................................................................................. 54
DIGITAL SIDETONE ...................................................................................................................................................... 56
DAC DIGITAL VOLUME CONTROL .............................................................................................................................. 58
DAC SOFT MUTE AND SOFT UN-MUTE ..................................................................................................................... 60
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
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
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
BCLK AND LRCLK CONTROL ...................................................................................................................................... 90
DIGITAL PULL-UP AND PULL-DOWN .......................................................................................................................... 93
CLOCKING AND SAMPLE RATES ............................................................................... 95
SYSCLK CONTROL ...................................................................................................................................................... 97
CONTROL INTERFACE CLOCKING ............................................................................................................................ 97
DMIC / DAC CLOCK CONTROL ................................................................................................................................... 98
OPCLK CONTROL ........................................................................................................................................................ 99
TOCLK CONTROL ........................................................................................................................................................ 99
DAC OPERATION AT 88.2K / 96K .............................................................................................................................. 100
FREQUENCY LOCKED LOOP (FLL) .......................................................................... 101
GPIO OUTPUTS FROM FLL ....................................................................................................................................... 105
EXAMPLE FLL CALCULATION................................................................................................................................... 106
EXAMPLE FLL SETTINGS .......................................................................................................................................... 107
GENERAL PURPOSE INPUT/OUTPUT (GPIO) ......................................................... 108
USING IN1L AND IN1R AS INTERRUPT INPUTS ...................................................................................................... 114
CONTROL INTERFACE .............................................................................................. 115
CONTROL WRITE SEQUENCER ............................................................................... 117
INITIATING A SEQUENCE .......................................................................................................................................... 117
PROGRAMMING A SEQUENCE ................................................................................................................................ 118
FAST START-UP FROM STANDBY ........................................................................................................................... 127
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