wm8918 Wolfson Microelectronics plc, wm8918 Datasheet - Page 4

• Manufacturer Part Number: wm8918
• Description: Ultra Low Power Dac For Portable Audio Applications
• Manufacturer: Wolfson Microelectronics plc

WM8918
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DIGITAL MICROPHONE INTERFACE ........................................................................ 40
DYNAMIC RANGE CONTROL (DRC) ......................................................................... 45
RETUNE
DIGITAL MIXING ......................................................................................................... 54
DIGITAL-TO-ANALOGUE CONVERTER (DAC) ......................................................... 58
OUTPUT SIGNAL PATH ............................................................................................. 63
ANALOGUE OUTPUTS............................................................................................... 71
REFERENCE VOLTAGES AND MASTER BIAS ......................................................... 73
POP SUPPRESSION CONTROL ................................................................................ 74
CHARGE PUMP .......................................................................................................... 75
DC SERVO .................................................................................................................. 76
DIGITAL AUDIO INTERFACE ..................................................................................... 81
DIGITAL AUDIO INTERFACE CONTROL ................................................................... 88
MICBIAS CONTROL .................................................................................................................................................. 35
MICBIAS CURRENT DETECT ................................................................................................................................... 36
MICBIAS CURRENT DETECT FILTERING ............................................................................................................... 37
MICROPHONE HOOK SWITCH DETECTION .......................................................................................................... 39
DIGITAL MICROPHONE VOLUME CONTROL ......................................................................................................... 42
HIGH PASS FILTER .................................................................................................................................................. 44
COMPRESSION/LIMITING CAPABILITIES ............................................................................................................... 45
GAIN LIMITS ............................................................................................................................................................. 47
DYNAMIC CHARACTERISTICS ................................................................................................................................ 47
ANTI-CLIP CONTROL ............................................................................................................................................... 48
QUICK RELEASE CONTROL .................................................................................................................................... 49
GAIN SMOOTHING ................................................................................................................................................... 49
INITIALISATION ........................................................................................................................................................ 50
DEFAULT MODE (5-BAND PARAMETRIC EQ) ........................................................................................................ 51
RETUNE
EQ FILTER CHARACTERISTICS .............................................................................................................................. 52
DIGITAL MIXING PATHS .......................................................................................................................................... 54
DAC INTERFACE VOLUME BOOST ......................................................................................................................... 56
DIGITAL SIDETONE .................................................................................................................................................. 56
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 PATHS ENABLE .......................................................................................................................... 64
HEADPHONE / LINE OUTPUT SIGNAL PATHS ENABLE ........................................................................................ 64
OUTPUT MUX CONTROL ......................................................................................................................................... 68
OUTPUT VOLUME CONTROL .................................................................................................................................. 68
HEADPHONE OUTPUTS – HPOUTL AND HPOUTR ................................................................................................ 71
LINE OUTPUTS – LINEOUTL AND LINEOUTR ........................................................................................................ 71
EXTERNAL COMPONENTS FOR GROUND REFERENCED OUTPUTS.................................................................. 72
DISABLED INPUT CONTROL ................................................................................................................................... 74
DC SERVO ENABLE AND START-UP ...................................................................................................................... 76
DC SERVO ACTIVE MODES .................................................................................................................................... 79
DC SERVO READBACK............................................................................................................................................ 81
MASTER AND SLAVE MODE OPERATION.............................................................................................................. 82
OPERATION WITH TDM ........................................................................................................................................... 82
BCLK FREQUENCY .................................................................................................................................................. 83
AUDIO DATA FORMATS (NORMAL MODE) ............................................................................................................. 84
AUDIO DATA FORMATS (TDM MODE) .................................................................................................................... 86
TM
TM
MOBILE MODE ....................................................................................................................................... 52
MOBILE PARAMETRIC EQUALIZER (EQ) .............................................. 51
PD, Rev 4.0, September 2010
Production Data
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