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
w
PP, Rev 3.3, September 2012
3
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
