WM8955BL

Production Data

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PD Rev 4.1 February 2007

2

TABLE OF CONTENTS

DESCRIPTION....................................................................................................... 1

FEATURES ............................................................................................................ 1

APPLICATIONS..................................................................................................... 1

BLOCK DIAGRAM ................................................................................................ 1

TABLE OF CONTENTS......................................................................................... 2

PIN CONFIGURATION .......................................................................................... 3

ORDERING INFORMATION.................................................................................. 3

PIN DESCRIPTION................................................................................................ 4

ABSOLUTE MAXIMUM RATINGS ........................................................................ 5

RECOMMENDED OPERATING CONDITIONS..................................................... 5

ELECTRICAL CHARACTERISTICS ..................................................................... 6

TERMINOLOGY ............................................................................................................... 7

OUTPUT PGA’S LINEARITY ........................................................................................... 8

HEADPHONE OUTPUT THD VERSUS POWER ............................................................ 9

POWER CONSUMPTION .............................................................................................. 10

AUDIO PATHS OVERVIEW ................................................................................ 11

SIGNAL TIMING REQUIREMENTS .................................................................... 12

SYSTEM CLOCK TIMING.............................................................................................. 12

AUDIO INTERFACE TIMING – MASTER MODE .......................................................... 12

AUDIO INTERFACE TIMING – SLAVE MODE.............................................................. 13

CONTROL INTERFACE TIMING – 3-WIRE MODE....................................................... 13

CONTROL INTERFACE TIMING – 2-WIRE MODE....................................................... 14

INTERNAL POWER ON RESET CIRCUIT .......................................................... 15

DEVICE DESCRIPTION ...................................................................................... 16

INTRODUCTION ............................................................................................................ 16

SIGNAL PATH................................................................................................................ 16

LINE INPUTS AND OUTPUT MIXERS .......................................................................... 20

ANALOGUE OUTPUTS ................................................................................................. 23

DIGITAL AUDIO INTERFACE........................................................................................ 26

MASTER CLOCK AND PHASE LOCKED LOOP........................................................... 29

AUDIO SAMPLE RATES................................................................................................ 31

CONTROL INTERFACE................................................................................................. 33

POWER SUPPLIES ....................................................................................................... 34

POWER MANAGEMENT ............................................................................................... 35

REGISTER MAP .................................................................................................. 37

DIGITAL FILTER CHARACTERISTICS .............................................................. 38

TERMINOLOGY ............................................................................................................. 38

DAC FILTER RESPONSES ........................................................................................... 38

APPLICATIONS INFORMATION ........................................................................ 40

RECOMMENDED EXTERNAL COMPONENTS ............................................................ 40

MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS.......................................... 41

LINE OUTPUT CONFIGURATION................................................................................. 41

HEADPHONE OUTPUT CONFIGURATION.................................................................. 42

EARPIECE OUTPUT CONFIGURATION ...................................................................... 42

PACKAGE DIMENSIONS.................................................................................... 43

IMPORTANT NOTICE ......................................................................................... 44

ADDRESS: ..................................................................................................................... 44