WM8988 datasheet(2/56 Pages) WOLFSON

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WM8988

Production Data

PD, Rev 4.0, October 2008

TABLE OF CONTENTS

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

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

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

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

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

PIN CONFIGURATION AND DEVICE MARKING..................................................3

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

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

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

RECOMMENDED OPERATION CONDITIONS .....................................................5

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

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

SIGNAL TIMING REQUIREMENTS .....................................................................11

SYSTEM CLOCK TIMING............................................................................................ 11

AUDIO INTERFACE TIMING – MASTER MODE ......................................................... 11

AUDIO INTERFACE TIMING – SLAVE MODE ............................................................ 12

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

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

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

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

AUTOMATIC LEVEL CONTROL (ALC) ....................................................................... 22

OUTPUT SIGNAL PATH.............................................................................................. 26

ANALOGUE OUTPUTS ............................................................................................... 31

ENABLING THE OUTPUTS ......................................................................................... 33

THERMAL SHUTDOWN .............................................................................................. 33

DIGITAL AUDIO INTERFACE...................................................................................... 34

AUDIO INTERFACE CONTROL .................................................................................. 37

CLOCKING AND SAMPLE RATES .............................................................................. 39

CONTROL INTERFACE .............................................................................................. 41

POWER SUPPLIES ..................................................................................................... 42

POWER MANAGEMENT ............................................................................................. 42

DIGITAL FILTER CHARACTERISTICS ...............................................................47

TERMINOLOGY........................................................................................................... 47

DAC FILTER RESPONSES ......................................................................................... 48

ADC FILTER RESPONSES ......................................................................................... 49

DE-EMPHASIS FILTER RESPONSES ........................................................................ 50

HIGHPASS FILTER ..................................................................................................... 51

APPLICATIONS INFORMATION .........................................................................52

RECOMMENDED EXTERNAL COMPONENTS........................................................... 52

LINE INPUT CONFIGURATION................................................................................... 53

HEADPHONE OUTPUT CONFIGURATION ................................................................ 53

LINE OUTPUT CONFIGURATION............................................................................... 53

MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS ........................................ 54

POWER MANAGEMENT EXAMPLES ......................................................................... 54

PACKAGE DIMENSIONS ....................................................................................55

IMPORTANT NOTICE ..........................................................................................56

ADDRESS.................................................................................................................... 56

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