Pre-Production
WM8904
TABLE OF CONTENTS
DESCRIPTION....................................................................................................... 1
FEATURES............................................................................................................ 1
APPLICATIONS..................................................................................................... 1
BLOCK DIAGRAM ................................................................................................ 2
TABLE OF CONTENTS......................................................................................... 3
AUDIO SIGNAL PATHS DIAGRAM...................................................................... 6
PIN CONFIGURATION.......................................................................................... 7
ORDERING INFORMATION.................................................................................. 8
PIN DESCRIPTION................................................................................................ 9
ABSOLUTE MAXIMUM RATINGS...................................................................... 10
RECOMMENDED OPERATING CONDITIONS................................................... 10
ELECTRICAL CHARACTERISTICS ................................................................... 11
TERMINOLOGY ............................................................................................................ 11
COMMON TEST CONDITIONS .................................................................................... 11
INPUT SIGNAL PATH ................................................................................................... 12
OUTPUT SIGNAL PATH ............................................................................................... 16
BYPASS PATH.............................................................................................................. 18
CHARGE PUMP............................................................................................................ 18
FLL ................................................................................................................................ 18
OTHER PARAMETERS ................................................................................................ 19
POWER CONSUMPTION.................................................................................... 21
COMMON TEST CONDITIONS .................................................................................... 21
POWER CONSUMPTION MEASUREMENTS.............................................................. 21
SIGNAL TIMING REQUIREMENTS .................................................................... 25
COMMON TEST CONDITIONS .................................................................................... 25
MASTER CLOCK .......................................................................................................... 25
AUDIO INTERFACE TIMING ........................................................................................ 26
MASTER MODE ............................................................................................................................................................ 26
SLAVE MODE................................................................................................................................................................ 27
TDM MODE ................................................................................................................................................................... 28
CONTROL INTERFACE TIMING .................................................................................. 29
DIGITAL FILTER CHARACTERISTICS .............................................................. 30
ADC FILTER RESPONSES .......................................................................................... 31
ADC HIGH PASS FILTER RESPONSES...................................................................... 31
DAC FILTER RESPONSES .......................................................................................... 32
DE-EMPHASIS FILTER RESPONSES ......................................................................... 33
DEVICE DESCRIPTION ...................................................................................... 34
INTRODUCTION ........................................................................................................... 34
ANALOGUE INPUT SIGNAL PATH .............................................................................. 35
INPUT PGA ENABLE .................................................................................................................................................... 36
INPUT PGA CONFIGURATION..................................................................................................................................... 36
SINGLE-ENDED INPUT ................................................................................................................................................ 38
DIFFERENTIAL LINE INPUT......................................................................................................................................... 38
DIFFERENTIAL MICROPHONE INPUT........................................................................................................................ 39
INPUT PGA GAIN CONTROL ....................................................................................................................................... 39
INPUT PGA COMMON MODE AMPLIFIER.................................................................................................................. 41
ELECTRET CONDENSER MICROPHONE INTERFACE............................................. 42
MICBIAS CONTROL...................................................................................................................................................... 42
PP, Rev 3.3, September 2012
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
