WM8918 datasheet(4/176 Pages) CIRRUS

4 / 176 page

WM8918

Production Data

PD, Rev 4.1, January 2012

MICBIAS CURRENT DETECT ...................................................................................................................................... 36

MICBIAS CURRENT DETECT FILTERING .................................................................................................................. 37

MICROPHONE HOOK SWITCH DETECTION.............................................................................................................. 39

DIGITAL MICROPHONE INTERFACE.......................................................................... 40

DIGITAL MICROPHONE VOLUME CONTROL............................................................................................................. 42

HIGH PASS FILTER ...................................................................................................................................................... 44

DYNAMIC RANGE CONTROL (DRC)........................................................................... 45

COMPRESSION/LIMITING CAPABILITIES .................................................................................................................. 45

GAIN LIMITS.................................................................................................................................................................. 47

DYNAMIC CHARACTERISTICS ................................................................................................................................... 47

ANTI-CLIP CONTROL ................................................................................................................................................... 48

QUICK RELEASE CONTROL ....................................................................................................................................... 49

GAIN SMOOTHING ....................................................................................................................................................... 49

INITIALISATION ............................................................................................................................................................ 50

RETUNETM MOBILE PARAMETRIC EQUALIZER (EQ)................................................ 51

DEFAULT MODE (5-BAND PARAMETRIC EQ) ........................................................................................................... 51

RETUNE

TM MOBILE MODE........................................................................................................................................... 52

EQ FILTER CHARACTERISTICS ................................................................................................................................. 52

DIGITAL MIXING ........................................................................................................... 54

DIGITAL MIXING PATHS .............................................................................................................................................. 54

DAC INTERFACE VOLUME BOOST ............................................................................................................................ 56

DIGITAL SIDETONE...................................................................................................................................................... 56

DIGITAL-TO-ANALOGUE CONVERTER (DAC) ........................................................... 58

DAC DIGITAL VOLUME CONTROL.............................................................................................................................. 58

DAC SOFT MUTE AND SOFT UN-MUTE ..................................................................................................................... 60

DAC MONO MIX............................................................................................................................................................ 61

DAC DE-EMPHASIS...................................................................................................................................................... 61

DAC SLOPING STOPBAND FILTER ............................................................................................................................ 62

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

OUTPUT VOLUME CONTROL...................................................................................................................................... 69

ANALOGUE OUTPUTS................................................................................................. 72

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

CHARGE PUMP ............................................................................................................ 76

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

AUDIO INTERFACE OUTPUT TRI-STATE ................................................................................................................... 90

WM8918 Datasheet(PDF) 4 Page - Cirrus Logic

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