WM8994 datasheet(5/359 Pages) WOLFSON

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Production Data

WM8994

PD, April 2012, Rev 4.4

EXAMPLE FLL SETTINGS............................................................................................................................................ 204

SAMPLE RATE CONVERSION ................................................................................... 205

SAMPLE RATE CONVERTER 1 (SRC1) ...................................................................................................................... 205

SAMPLE RATE CONVERTER 2 (SRC2) ...................................................................................................................... 205

SAMPLE RATE CONVERTER RESTRICTIONS .......................................................................................................... 205

SAMPLE RATE CONVERTER CONFIGURATION ERROR INDICATION ................................................................... 207

CONTROL INTERFACE............................................................................................... 208

SELECTION OF CONTROL INTERFACE MODE......................................................................................................... 208

2-WIRE (I2C) CONTROL MODE ................................................................................................................................... 209

3-WIRE (SPI) CONTROL MODE................................................................................................................................... 212

4-WIRE (SPI) CONTROL MODE................................................................................................................................... 213

CONTROL WRITE SEQUENCER................................................................................ 214

INITIATING A SEQUENCE............................................................................................................................................ 214

PROGRAMMING A SEQUENCE .................................................................................................................................. 215

DEFAULT SEQUENCES ............................................................................................................................................... 218

LDO REGULATORS .................................................................................................... 224

POP SUPPRESSION CONTROL ................................................................................ 227

DISABLED LINE OUTPUT CONTROL.......................................................................................................................... 227

LINE OUTPUT DISCHARGE CONTROL ...................................................................................................................... 228

VMID REFERENCE DISCHARGE CONTROL.............................................................................................................. 228

INPUT VMID CLAMPS .................................................................................................................................................. 228

REFERENCE VOLTAGES AND MASTER BIAS ......................................................... 229

POWER MANAGEMENT ............................................................................................. 230

THERMAL SHUTDOWN .............................................................................................. 235

POWER ON RESET..................................................................................................... 236

QUICK START-UP AND SHUTDOWN ........................................................................ 238

SOFTWARE RESET AND DEVICE ID......................................................................... 239

APPLICATIONS INFORMATION ...................................................................... 345

RECOMMENDED EXTERNAL COMPONENTS .......................................................... 345

AUDIO INPUT PATHS................................................................................................................................................... 345

HEADPHONE OUTPUT PATH...................................................................................................................................... 346

EARPIECE DRIVER OUTPUT PATH............................................................................................................................ 347

LINE OUTPUT PATHS .................................................................................................................................................. 347

POWER SUPPLY DECOUPLING ................................................................................................................................. 348

CHARGE PUMP COMPONENTS ................................................................................................................................. 349

MICROPHONE BIAS CIRCUIT ..................................................................................................................................... 349

CLASS D SPEAKER CONNECTIONS .......................................................................................................................... 350

RECOMMENDED EXTERNAL COMPONENTS DIAGRAM ......................................................................................... 352

DIGITAL AUDIO INTERFACE CLOCKING CONFIGURATIONS................................. 353

PCB LAYOUT CONSIDERATIONS ............................................................................. 356

CLASS D LOUDSPEAKER CONNECTION .................................................................................................................. 356

PACKAGE DIMENSIONS.................................................................................. 357

IMPORTANT NOTICE ....................................................................................... 358

ADDRESS: ................................................................................................................... 358

REVISION HISTORY ......................................................................................... 359

WM8994 Datasheet(PDF) 5 Page - Wolfson Microelectronics plc

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