WM8955L

Production Data

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PD Rev 4.2 March 2006

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

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

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

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

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

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

SPEAKER THD AND NOISE VERSUS POWER ......................................................... 10

POWER CONSUMPTION ....................................................................................11

AUDIO PATHS OVERVIEW .................................................................................12

SIGNAL TIMING REQUIREMENTS .....................................................................13

SYSTEM CLOCK TIMING............................................................................................ 13

AUDIO INTERFACE TIMING – MASTER MODE ......................................................... 13

AUDIO INTERFACE TIMING – SLAVE MODE ............................................................ 14

CONTROL INTERFACE TIMING – 3-WIRE MODE ..................................................... 14

CONTROL INTERFACE TIMING – 2-WIRE MODE ..................................................... 15

INTERNAL POWER ON RESET CIRCUIT ..........................................................16

DEVICE DESCRIPTION .......................................................................................17

INTRODUCTION.......................................................................................................... 17

SIGNAL PATH ............................................................................................................. 17

LINE INPUTS AND OUTPUT MIXERS ........................................................................ 21

ANALOGUE OUTPUTS ............................................................................................... 24

DIGITAL AUDIO INTERFACE...................................................................................... 28

MASTER CLOCK AND PHASE LOCKED LOOP ......................................................... 31

AUDIO SAMPLE RATES.............................................................................................. 33

CONTROL INTERFACE .............................................................................................. 35

POWER SUPPLIES ..................................................................................................... 36

POWER MANAGEMENT ............................................................................................. 37

REGISTER MAP...................................................................................................39

DIGITAL FILTER CHARACTERISTICS ...............................................................40

TERMINOLOGY........................................................................................................... 40

DAC FILTER RESPONSES ......................................................................................... 40

APPLICATIONS INFORMATION .........................................................................42

RECOMMENDED EXTERNAL COMPONENTS........................................................... 42

MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS ........................................ 43

LINE OUTPUT CONFIGURATION............................................................................... 43

HEADPHONE OUTPUT CONFIGURATION ................................................................ 44

SPEAKER OUTPUT CONFIGURATION...................................................................... 44

PACKAGE DIMENSIONS ....................................................................................45

IMPORTANT NOTICE ..........................................................................................46

ADDRESS:................................................................................................................... 46