WM8994 datasheet(3/359 Pages) WOLFSON

3 / 359 page

Production Data

WM8994

PD, April 2012, Rev 4.4

INPUT MIXER CONFIGURATION AND VOLUME CONTROL ....................................................................................... 52

DIGITAL MICROPHONE INTERFACE .......................................................................... 56

DIGITAL PULL-UP AND PULL-DOWN............................................................................................................................ 59

ANALOGUE TO DIGITAL CONVERTER (ADC) ............................................................ 59

ADC CLOCKING CONTROL ........................................................................................................................................... 60

DIGITAL CORE ARCHITECTURE ................................................................................. 61

DIGITAL MIXING............................................................................................................ 63

AUDIO INTERFACE 1 (AIF1) OUTPUT MIXING............................................................................................................. 64

DIGITAL SIDETONE MIXING.......................................................................................................................................... 65

DIGITAL SIDETONE VOLUME AND FILTER CONTROL............................................................................................... 65

DAC OUTPUT DIGITAL MIXING..................................................................................................................................... 67

AUDIO INTERFACE 2 (AIF2) DIGITAL MIXING ............................................................................................................. 68

ULTRASONIC (4FS) AIF OUTPUT MODE...................................................................................................................... 69

DYNAMIC RANGE CONTROL (DRC) ........................................................................... 70

DRC COMPRESSION / EXPANSION / LIMITING........................................................................................................... 71

GAIN LIMITS.................................................................................................................................................................... 72

DYNAMIC CHARACTERISTICS ..................................................................................................................................... 72

ANTI-CLIP CONTROL ..................................................................................................................................................... 73

QUICK RELEASE CONTROL ......................................................................................................................................... 73

SIGNAL ACTIVITY DETECT ........................................................................................................................................... 73

DRC REGISTER CONTROLS......................................................................................................................................... 74

RETUNETM MOBILE PARAMETRIC EQUALIZER (EQ) ................................................ 83

DEFAULT MODE (5-BAND PARAMETRIC EQ) ............................................................................................................. 83

RETUNE

TM MOBILE MODE............................................................................................................................................. 86

EQ FILTER CHARACTERISTICS ................................................................................................................................... 87

3D STEREO EXPANSION ............................................................................................. 88

DIGITAL VOLUME AND FILTER CONTROL................................................................. 89

AIF1 - OUTPUT PATH VOLUME CONTROL .................................................................................................................. 89

AIF1 - OUTPUT PATH HIGH PASS FILTER................................................................................................................... 92

AIF1 - INPUT PATH VOLUME CONTROL ...................................................................................................................... 93

AIF1 - INPUT PATH SOFT MUTE CONTROL ................................................................................................................ 96

AIF1 - INPUT PATH MONO MIX AND DE-EMPHASIS FILTER ..................................................................................... 97

AIF2 - OUTPUT PATH VOLUME CONTROL .................................................................................................................. 97

AIF2 - OUTPUT PATH HIGH PASS FILTER................................................................................................................... 98

AIF2 - INPUT PATH VOLUME CONTROL ...................................................................................................................... 99

AIF2 - INPUT PATH SOFT MUTE CONTROL ................................................................................................................ 99

AIF2 - INPUT PATH MONO MIX AND DE-EMPHASIS FILTER ................................................................................... 100

DIGITAL TO ANALOGUE CONVERTER (DAC) .......................................................... 101

DAC CLOCKING CONTROL ......................................................................................................................................... 101

DAC DIGITAL VOLUME ................................................................................................................................................ 103

DAC SOFT MUTE AND SOFT UN-MUTE..................................................................................................................... 106

ANALOGUE OUTPUT SIGNAL PATH ......................................................................... 108

OUTPUT SIGNAL PATHS ENABLE.............................................................................................................................. 109

HEADPHONE SIGNAL PATHS ENABLE...................................................................................................................... 111

OUTPUT MIXER CONTROL ......................................................................................................................................... 113

SPEAKER MIXER CONTROL ....................................................................................................................................... 117

OUTPUT SIGNAL PATH VOLUME CONTROL............................................................................................................. 120

SPEAKER BOOST MIXER ............................................................................................................................................ 125

EARPIECE DRIVER MIXER.......................................................................................................................................... 125

LINE OUTPUT MIXERS ................................................................................................................................................ 126

CHARGE PUMP........................................................................................................... 130

DC SERVO................................................................................................................... 132

DC SERVO ENABLE AND START-UP ......................................................................................................................... 132

DC SERVO ACTIVE MODES ........................................................................................................................................ 134

GPIO / INTERRUPT OUTPUTS FROM DC SERVO..................................................................................................... 136

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