WM8904 datasheet(4/184 Pages) CIRRUS

4 / 184 page

WM8904

Rev 4.0

MICBIAS CURRENT DETECT ....................................................................................................................................................43

MICBIAS CURRENT DETECT FILTERING ................................................................................................................................43

MICROPHONE HOOK SWITCH DETECTION............................................................................................................................45

DIGITAL MICROPHONE INTERFACE....................................................................................46

ANALOGUE-TO-DIGITAL CONVERTER (ADC) .....................................................................47

ADC DIGITAL VOLUME CONTROL............................................................................................................................................48

HIGH PASS FILTER ....................................................................................................................................................................50

ADC OVERSAMPLING RATIO (OSR) ........................................................................................................................................51

DYNAMIC RANGE CONTROL (DRC).....................................................................................51

COMPRESSION/LIMITING CAPABILITIES ................................................................................................................................52

GAIN LIMITS................................................................................................................................................................................53

DYNAMIC CHARACTERISTICS .................................................................................................................................................54

ANTI-CLIP CONTROL .................................................................................................................................................................54

QUICK RELEASE CONTROL .....................................................................................................................................................55

GAIN SMOOTHING .....................................................................................................................................................................56

INITIALISATION ..........................................................................................................................................................................56

RETUNETM MOBILE PARAMETRIC EQUALIZER (EQ)..........................................................57

DEFAULT MODE (5-BAND PARAMETRIC EQ) .........................................................................................................................57

RETUNETM MOBILE MODE.........................................................................................................................................................58

EQ FILTER CHARACTERISTICS ...............................................................................................................................................58

DIGITAL MIXING .....................................................................................................................60

DIGITAL MIXING PATHS ............................................................................................................................................................60

DAC INTERFACE VOLUME BOOST ..........................................................................................................................................62

DIGITAL SIDETONE....................................................................................................................................................................62

DIGITAL-TO-ANALOGUE CONVERTER (DAC) .....................................................................64

DAC DIGITAL VOLUME CONTROL............................................................................................................................................64

DAC SOFT MUTE AND SOFT UN-MUTE ...................................................................................................................................66

DAC MONO MIX ..........................................................................................................................................................................67

DAC DE-EMPHASIS....................................................................................................................................................................67

DAC SLOPING STOPBAND FILTER ..........................................................................................................................................68

DAC OVERSAMPLING RATIO (OSR) ........................................................................................................................................68

OUTPUT SIGNAL PATH .........................................................................................................69

OUTPUT SIGNAL PATHS ENABLE ............................................................................................................................................70

HEADPHONE / LINE OUTPUT SIGNAL PATHS ENABLE .........................................................................................................70

OUTPUT MUX CONTROL...........................................................................................................................................................73

OUTPUT VOLUME CONTROL....................................................................................................................................................74

ANALOGUE OUTPUTS...........................................................................................................76

HEADPHONE OUTPUTS

– HPOUTL AND HPOUTR.................................................................................................................76

LINE OUTPUTS

– LINEOUTL AND LINEOUTR..........................................................................................................................76

EXTERNAL COMPONENTS FOR GROUND REFERENCED OUTPUTS..................................................................................77

REFERENCE VOLTAGES AND MASTER BIAS.....................................................................77

ANALOGUE REFERENCE AND MASTER BIAS ........................................................................................................................77

LOW POWER PLAYBACK MODE ..............................................................................................................................................79

POP SUPPRESSION CONTROL............................................................................................80

DISABLED INPUT CONTROL .....................................................................................................................................................80

CHARGE PUMP ......................................................................................................................80

DC SERVO ..............................................................................................................................82

DC SERVO ENABLE AND START-UP .......................................................................................................................................82

DC SERVO ACTIVE MODES ......................................................................................................................................................85

DC SERVO READBACK .............................................................................................................................................................87

DIGITAL AUDIO INTERFACE .................................................................................................87

MASTER AND SLAVE MODE OPERATION...............................................................................................................................87

OPERATION WITH TDM .............................................................................................................................................................88

BCLK FREQUENCY ....................................................................................................................................................................89

AUDIO DATA FORMATS (NORMAL MODE) ..............................................................................................................................89

WM8904 Datasheet(PDF) 4 Page - Cirrus Logic

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