WM8918 datasheet(3/176 Pages) CIRRUS

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Production Data

WM8918

PD, Rev 4.1, January 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.................................................................................. 7

PIN DESCRIPTION................................................................................................ 8

ABSOLUTE MAXIMUM RATINGS ........................................................................ 9

RECOMMENDED OPERATING CONDITIONS..................................................... 9

ELECTRICAL CHARACTERISTICS ................................................................... 10

TERMINOLOGY ............................................................................................................ 10

COMMON TEST CONDITIONS .................................................................................... 10

INPUT SIGNAL PATH ................................................................................................... 11

OUTPUT SIGNAL PATH ............................................................................................... 11

BYPASS PATH.............................................................................................................. 12

CHARGE PUMP ............................................................................................................ 13

FLL ................................................................................................................................ 13

OTHER PARAMETERS ................................................................................................ 13

POWER CONSUMPTION.................................................................................... 16

COMMON TEST CONDITIONS .................................................................................... 16

POWER CONSUMPTION MEASUREMENTS .............................................................. 16

SIGNAL TIMING REQUIREMENTS .................................................................... 18

COMMON TEST CONDITIONS .................................................................................... 18

MASTER CLOCK .......................................................................................................... 18

AUDIO INTERFACE TIMING ........................................................................................ 19

MASTER MODE ............................................................................................................................................................ 19

SLAVE MODE................................................................................................................................................................ 20

TDM MODE ................................................................................................................................................................... 21

CONTROL INTERFACE TIMING .................................................................................. 22

DIGITAL FILTER CHARACTERISTICS .............................................................. 23

DMIC FILTER RESPONSES......................................................................................... 24

DMIC HIGH PASS FILTER RESPONSES .................................................................... 24

DAC FILTER RESPONSES .......................................................................................... 25

DE-EMPHASIS FILTER RESPONSES ......................................................................... 26

DEVICE DESCRIPTION ...................................................................................... 27

INTRODUCTION ........................................................................................................... 27

ANALOGUE INPUT SIGNAL PATH .............................................................................. 28

INPUT PGA ENABLE .................................................................................................................................................... 29

INPUT PGA CONFIGURATION..................................................................................................................................... 29

SINGLE-ENDED INPUT ................................................................................................................................................ 31

DIFFERENTIAL LINE INPUT......................................................................................................................................... 31

DIFFERENTIAL MICROPHONE INPUT........................................................................................................................ 32

INPUT PGA GAIN CONTROL ....................................................................................................................................... 32

INPUT PGA COMMON MODE AMPLIFIER .................................................................................................................. 34

ELECTRET CONDENSER MICROPHONE INTERFACE ............................................. 35

MICBIAS CONTROL...................................................................................................................................................... 35

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