WM8976 datasheet(2/83 Pages) WOLFSON

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WM8976

Preliminary Technical Data

PTD Rev 2.0 February 2005

TABLE OF CONTENTS

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

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

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

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

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

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

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

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

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

TERMINOLOGY............................................................................................................ 8

SPEAKER OUTPUT THD VERSUS POWER ......................................................10

POWER CONSUMPTION ....................................................................................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

RECOMMENDED POWER UP/DOWN SEQUENCE .................................................. 18

DEVICE DESCRIPTION .......................................................................................22

INTRODUCTION ......................................................................................................... 22

INPUT SIGNAL PATH ................................................................................................. 24

ANALOGUE TO DIGITAL CONVERTER (ADC).......................................................... 29

INPUT LIMITER / AUTOMATIC LEVEL CONTROL (ALC) .......................................... 32

OUTPUT SIGNAL PATH ............................................................................................. 36

3D STEREO ENHANCEMENT .................................................................................... 42

ANALOGUE OUTPUTS............................................................................................... 43

DIGITAL AUDIO INTERFACES................................................................................... 56

AUDIO SAMPLE RATES ............................................................................................. 63

MASTER CLOCK AND PHASE LOCKED LOOP (PLL) ............................................... 63

GENERAL PURPOSE INPUT/OUTPUT...................................................................... 65

OUTPUT SWITCHING (JACK DETECT)..................................................................... 66

CONTROL INTERFACE.............................................................................................. 68

RESETTING THE CHIP .............................................................................................. 69

POWER SUPPLIES .................................................................................................... 69

POWER MANAGEMENT ............................................................................................ 70

DIGITAL FILTER CHARACTERISTICS ...............................................................74

TERMINOLOGY.......................................................................................................... 74

DAC FILTER RESPONSES......................................................................................... 75

ADC FILTER RESPONSES......................................................................................... 75

HIGHPASS FILTER..................................................................................................... 76

5-BAND EQUALISER .................................................................................................. 77

APPLICATIONS INFORMATION .........................................................................81

RECOMMENDED EXTERNAL COMPONENTS .......................................................... 81

IMPORTANT NOTICE ..........................................................................................83

ADDRESS: .................................................................................................................. 83

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