WM8993 datasheet(4/229 Pages) WOLFSON

4 / 229 page

WM8993

Production Data

PD, November 2010, Rev 4.0

ADC / DAC CLOCK CONTROL ................................................................................................................................. 127

256K, DC SERVO, CLASS D CLOCK CONTROL ..................................................................................................... 128

OPCLK CONTROL .................................................................................................................................................... 130

TOCLK CONTROL .................................................................................................................................................... 130

BCLK AND LRCLK CONTROL .................................................................................................................................. 131

FREQUENCY LOCKED LOOP (FLL)......................................................................................................................... 131

FREE-RUNNING FLL CLOCK ................................................................................................................................... 135

EXAMPLE FLL CALCULATION ................................................................................................................................. 136

EXAMPLE FLL SETTINGS ........................................................................................................................................ 137

CONTROL INTERFACE ............................................................................................ 138

CONTROL WRITE SEQUENCER.............................................................................. 141

INITIATING A SEQUENCE........................................................................................................................................ 141

PROGRAMMING A SEQUENCE............................................................................................................................... 142

DEFAULT SEQUENCES ........................................................................................................................................... 144

POP SUPPRESSION CONTROL............................................................................... 152

DISABLED LINE OUTPUT CONTROL ...................................................................................................................... 152

LINE OUTPUT DISCHARGE CONTROL................................................................................................................... 152

VMID REFERENCE DISCHARGE CONTROL........................................................................................................... 153

INPUT VMID CLAMPS .............................................................................................................................................. 153

REFERENCE VOLTAGES AND MASTER BIAS........................................................ 154

POWER MANAGEMENT ........................................................................................... 155

POWER ON RESET .................................................................................................. 159

QUICK START-UP AND SHUTDOWN ...................................................................... 161

SOFTWARE RESET AND DEVICE ID....................................................................... 162

THERMAL SHUTDOWN ............................................................................................ 163

DIGITAL FILTER CHARACTERISTICS .............................................................214

ADC FILTER RESPONSES ....................................................................................... 215

ADC HIGH PASS FILTER RESPONSES ................................................................... 215

DAC FILTER RESPONSES ....................................................................................... 216

DE-EMPHASIS FILTER RESPONSES ...................................................................... 217

APPLICATIONS INFORMATION .......................................................................218

RECOMMENDED EXTERNAL COMPONENTS......................................................... 218

AUDIO INPUT PATHS............................................................................................................................................... 218

HEADPHONE OUTPUT PATH .................................................................................................................................. 220

EARPIECE DRIVER OUTPUT PATH ........................................................................................................................ 220

LINE OUTPUT PATHS .............................................................................................................................................. 220

POWER SUPPLY DECOUPLING.............................................................................................................................. 221

CHARGE PUMP COMPONENTS.............................................................................................................................. 222

MICROPHONE BIAS CIRCUIT.................................................................................................................................. 222

CLASS D SPEAKER CONNECTIONS ...................................................................................................................... 223

RECOMMENDED EXTERNAL COMPONENTS DIAGRAM....................................................................................... 225

PCB LAYOUT CONSIDERATIONS............................................................................ 227

CLASS D LOUDSPEAKER CONNECTION ............................................................................................................... 227

PACKAGE DIMENSIONS ..................................................................................228

IMPORTANT NOTICE ........................................................................................229

ADDRESS:................................................................................................................. 229

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