WM8994 Datasheet, PDF (5/359 Pages) Wolfson Microelectronics plc – Multi-Channel Audio Hub CODEC for Smartphones

Production Data
WM8994
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
REGISTER MAP ................................................................................................ 240
REGISTER BITS BY ADDRESS .................................................................................. 251
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
w
PD, April 2012, Rev 4.4
5