WM8912
Production Data
DIGITAL-TO-ANALOGUE CONVERTER (DAC) ......................................................... 32
DAC DIGITAL VOLUME CONTROL ..........................................................................................................................32
DAC SOFT MUTE AND SOFT UN-MUTE..................................................................................................................34
DAC MONO MIX........................................................................................................................................................35
DAC DE-EMPHASIS..................................................................................................................................................35
DAC SLOPING STOPBAND FILTER.........................................................................................................................36
DAC OVERSAMPLING RATIO (OSR).......................................................................................................................36
OUTPUT SIGNAL PATH............................................................................................. 37
OUTPUT SIGNAL PATHS ENABLE ..........................................................................................................................38
HEADPHONE / LINE OUTPUT SIGNAL PATHS ENABLE........................................................................................38
OUTPUT VOLUME CONTROL..................................................................................................................................41
ANALOGUE OUTPUTS............................................................................................... 44
HEADPHONE OUTPUTS – HPOUTL AND HPOUTR................................................................................................44
LINE OUTPUTS – LINEOUTL AND LINEOUTR ........................................................................................................44
EXTERNAL COMPONENTS FOR GROUND REFERENCED OUTPUTS..................................................................45
REFERENCE VOLTAGES AND MASTER BIAS ......................................................... 46
CHARGE PUMP.......................................................................................................... 46
DC SERVO.................................................................................................................. 48
DC SERVO ENABLE AND START-UP......................................................................................................................48
DC SERVO ACTIVE MODES ....................................................................................................................................51
DC SERVO READBACK............................................................................................................................................53
DIGITAL AUDIO INTERFACE..................................................................................... 53
MASTER AND SLAVE MODE OPERATION..............................................................................................................53
OPERATION WITH TDM...........................................................................................................................................54
BCLK FREQUENCY..................................................................................................................................................55
AUDIO DATA FORMATS (NORMAL MODE).............................................................................................................55
AUDIO DATA FORMATS (TDM MODE) ....................................................................................................................57
DIGITAL AUDIO INTERFACE CONTROL................................................................... 59
AUDIO INTERFACE OUTPUT TRI-STATE ...............................................................................................................59
BCLK AND LRCLK CONTROL ..................................................................................................................................60
COMPANDING ..........................................................................................................................................................61
DIGITAL PULL-UP AND PULL-DOWN ......................................................................................................................63
CLOCKING AND SAMPLE RATES ............................................................................. 64
SYSCLK CONTROL ..................................................................................................................................................65
CONTROL INTERFACE CLOCKING.........................................................................................................................66
CLOCKING CONFIGURATION .................................................................................................................................66
DAC CLOCK CONTROL............................................................................................................................................67
OPCLK CONTROL ....................................................................................................................................................67
TOCLK CONTROL ....................................................................................................................................................68
DAC OPERATION AT 88.2K / 96K ............................................................................................................................69
FREQUENCY LOCKED LOOP (FLL) .......................................................................... 70
FREE-RUNNING FLL CLOCK ...................................................................................................................................73
EXAMPLE FLL CALCULATION.................................................................................................................................74
GPIO OUTPUTS FROM FLL .....................................................................................................................................75
EXAMPLE FLL SETTINGS........................................................................................................................................75
GENERAL PURPOSE INPUT/OUTPUT (GPIO).......................................................... 76
IRQ/GPIO1 ................................................................................................................................................................76
BCLK/GPIO4 .............................................................................................................................................................77
INTERRUPTS ............................................................................................................. 78
CONTROL INTERFACE.............................................................................................. 80
CONTROL WRITE SEQUENCER............................................................................... 83
INITIATING A SEQUENCE........................................................................................................................................83
PROGRAMMING A SEQUENCE...............................................................................................................................84
DEFAULT SEQUENCES ...........................................................................................................................................86
PD, Rev 4.0, September 2010
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
