WM8912 datasheet(4/129 Pages) CIRRUS

4 / 129 page

WM8912

Production Data

PD, Rev 4.1, February 2013

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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