WM8987 datasheet(2/59 Pages) WOLFSON

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WM8987L

Production Data

PD Rev 4.0 August 2008

TABLE OF CONTENTS

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

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

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

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

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

PIN CONFIGURATION...........................................................................................4

ORDERING INFORMATION ..................................................................................4

PIN DESCRIPTION ................................................................................................5

ABSOLUTE MAXIMUM RATINGS.........................................................................6

RECOMMENDED OPERATION CONDITIONS .....................................................6

ELECTRICAL CHARACTERISTICS ......................................................................7

TYPICAL PERFORMANCE....................................................................................9

POWER CONSUMPTION.............................................................................................. 9

HEADPHONE OUTPUT THD VERSUS POWER (TYPICAL)....................................... 10

OUTPUT PGA’S LINEARITY ....................................................................................... 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 ..................................................... 14

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

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

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

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

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

AUTOMATIC LEVEL CONTROL (ALC) ....................................................................... 24

OUTPUT SIGNAL PATH.............................................................................................. 28

ANALOGUE OUTPUTS ............................................................................................... 33

DIGITAL AUDIO INTERFACE...................................................................................... 36

AUDIO INTERFACE CONTROL .................................................................................. 39

CLOCKING AND SAMPLE RATES.............................................................................. 41

CONTROL INTERFACE .............................................................................................. 43

POWER SUPPLIES ..................................................................................................... 44

POWER MANAGEMENT ............................................................................................. 45

DIGITAL FILTER CHARACTERISTICS ...............................................................48

TERMINOLOGY........................................................................................................... 48

DAC FILTER RESPONSES ......................................................................................... 49

ADC FILTER RESPONSES ......................................................................................... 50

DE-EMPHASIS FILTER RESPONSES ........................................................................ 51

HIGHPASS FILTER ..................................................................................................... 52

APPLICATIONS INFORMATION .........................................................................53

RECOMMENDED EXTERNAL COMPONENTS........................................................... 53

DRIVING BTL HEADSETS........................................................................................... 54

DRIVING SINGLE-ENDED HEADPHONES................................................................. 54

MICROPHONE INPUT CONFIGURATION .................................................................. 56

LINE INPUT CONFIGURATION................................................................................... 57

MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS ........................................ 57

POWER MANAGEMENT EXAMPLES ......................................................................... 57

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