WM8904ECSSLASHR datasheet(4/188 Pages) WOLFSON

4 / 188 page

WM8904

Pre-Production

PP, Rev 3.3, September 2012

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

MICBIAS CURRENT DETECT FILTERING .................................................................................................................. 44

MICROPHONE HOOK SWITCH DETECTION.............................................................................................................. 46

DIGITAL MICROPHONE INTERFACE.......................................................................... 47

ANALOGUE-TO-DIGITAL CONVERTER (ADC) ........................................................... 49

ADC DIGITAL VOLUME CONTROL.............................................................................................................................. 49

HIGH PASS FILTER ...................................................................................................................................................... 51

ADC OVERSAMPLING RATIO (OSR) .......................................................................................................................... 52

DYNAMIC RANGE CONTROL (DRC)........................................................................... 53

COMPRESSION/LIMITING CAPABILITIES .................................................................................................................. 53

GAIN LIMITS.................................................................................................................................................................. 55

DYNAMIC CHARACTERISTICS ................................................................................................................................... 55

ANTI-CLIP CONTROL ................................................................................................................................................... 56

QUICK RELEASE CONTROL ....................................................................................................................................... 57

GAIN SMOOTHING ....................................................................................................................................................... 57

INITIALISATION ............................................................................................................................................................ 58

RETUNETM MOBILE PARAMETRIC EQUALIZER (EQ)................................................ 59

DEFAULT MODE (5-BAND PARAMETRIC EQ) ........................................................................................................... 59

RETUNE

TM MOBILE MODE........................................................................................................................................... 60

EQ FILTER CHARACTERISTICS ................................................................................................................................. 60

DIGITAL MIXING ........................................................................................................... 62

DIGITAL MIXING PATHS .............................................................................................................................................. 62

DAC INTERFACE VOLUME BOOST ............................................................................................................................ 64

DIGITAL SIDETONE...................................................................................................................................................... 64

DIGITAL-TO-ANALOGUE CONVERTER (DAC) ........................................................... 66

DAC DIGITAL VOLUME CONTROL.............................................................................................................................. 66

DAC SOFT MUTE AND SOFT UN-MUTE ..................................................................................................................... 68

DAC MONO MIX............................................................................................................................................................ 69

DAC DE-EMPHASIS...................................................................................................................................................... 69

DAC SLOPING STOPBAND FILTER ............................................................................................................................ 70

DAC OVERSAMPLING RATIO (OSR) .......................................................................................................................... 70

OUTPUT SIGNAL PATH ............................................................................................... 71

OUTPUT SIGNAL PATHS ENABLE.............................................................................................................................. 72

HEADPHONE / LINE OUTPUT SIGNAL PATHS ENABLE ........................................................................................... 72

OUTPUT MUX CONTROL............................................................................................................................................. 76

OUTPUT VOLUME CONTROL...................................................................................................................................... 76

ANALOGUE OUTPUTS................................................................................................. 79

HEADPHONE OUTPUTS – HPOUTL AND HPOUTR................................................................................................... 79

LINE OUTPUTS – LINEOUTL AND LINEOUTR............................................................................................................ 79

EXTERNAL COMPONENTS FOR GROUND REFERENCED OUTPUTS.................................................................... 80

REFERENCE VOLTAGES AND MASTER BIAS........................................................... 81

ANALOGUE REFERENCE AND MASTER BIAS .......................................................................................................... 81

LOW POWER PLAYBACK MODE ................................................................................................................................ 82

POP SUPPRESSION CONTROL.................................................................................. 83

DISABLED INPUT CONTROL....................................................................................................................................... 83

CHARGE PUMP ............................................................................................................ 84

DC SERVO .................................................................................................................... 85

DC SERVO ENABLE AND START-UP ......................................................................................................................... 85

DC SERVO ACTIVE MODES ........................................................................................................................................ 88

DC SERVO READBACK ............................................................................................................................................... 90

DIGITAL AUDIO INTERFACE ....................................................................................... 90

MASTER AND SLAVE MODE OPERATION................................................................................................................. 91

OPERATION WITH TDM............................................................................................................................................... 91

BCLK FREQUENCY ...................................................................................................................................................... 92

WM8904ECS/R 数据表(PDF) 4 Page - Wolfson Microelectronics plc

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