WM8987LGECOSLASHRV datasheet(2/58 Pages) WOLFSON

2 / 58 page

WM8987L

Pre-Production

PP Rev 3.0 January 2007

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

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

TYPICAL PERFORMANCE....................................................................................8

POWER CONSUMPTION.............................................................................................. 8

HEADPHONE OUTPUT THD VERSUS POWER (TYPICAL)......................................... 9

OUTPUT PGA’S LINEARITY ....................................................................................... 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) ....................................................................... 23

OUTPUT SIGNAL PATH.............................................................................................. 27

ANALOGUE OUTPUTS ............................................................................................... 32

DIGITAL AUDIO INTERFACE...................................................................................... 35

AUDIO INTERFACE CONTROL .................................................................................. 38

CLOCKING AND SAMPLE RATES .............................................................................. 40

CONTROL INTERFACE .............................................................................................. 42

POWER SUPPLIES ..................................................................................................... 43

POWER MANAGEMENT ............................................................................................. 44

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

DRIVING BTL HEADSETS........................................................................................... 53

DRIVING SINGLE-ENDED HEADPHONES ................................................................. 53

MICROPHONE INPUT CONFIGURATION .................................................................. 55

LINE INPUT CONFIGURATION................................................................................... 56

MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS ........................................ 56

POWER MANAGEMENT EXAMPLES ......................................................................... 56

IMPORTANT NOTICE ..........................................................................................58

ADDRESS.................................................................................................................... 58

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