WM8904 datasheet(3/188 Pages) WOLFSON

3 / 188 page

Pre-Production

WM8904

PP, Rev 3.3, September 2012

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

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