WM8912 datasheet(4/128 Pages) WOLFSON

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WM8912

Production Data

PD, Rev 4.0, September 2010

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

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