WM8976 datasheet(2/108 Pages) WOLFSON

2 / 108 page

WM8976

Pre-Production

PP Rev 3.0 April 2006

TABLE OF CONTENTS

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

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

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

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

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

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

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

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

RECOMMENDED OPERATING CONDITIONS .....................................................6

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

TERMINOLOGY .......................................................................................................... 10

SPEAKER OUTPUT THD VERSUS POWER ......................................................11

POWER CONSUMPTION ....................................................................................12

AUDIO PATHS OVERVIEW .................................................................................14

SIGNAL TIMING REQUIREMENTS .....................................................................15

SYSTEM CLOCK TIMING ........................................................................................... 15

AUDIO INTERFACE TIMING – MASTER MODE ........................................................ 15

AUDIO INTERFACE TIMING – SLAVE MODE............................................................ 16

CONTROL INTERFACE TIMING – 3-WIRE MODE .................................................... 17

CONTROL INTERFACE TIMING – 2-WIRE MODE .................................................... 18

DEVICE DESCRIPTION .......................................................................................19

INTRODUCTION ......................................................................................................... 19

INPUT SIGNAL PATH ................................................................................................. 21

ANALOGUE TO DIGITAL CONVERTER (ADC).......................................................... 25

INPUT LIMITER / AUTOMATIC LEVEL CONTROL (ALC) .......................................... 29

OUTPUT SIGNAL PATH ............................................................................................. 41

3D STEREO ENHANCEMENT .................................................................................... 48

ANALOGUE OUTPUTS............................................................................................... 48

DIGITAL AUDIO INTERFACES................................................................................... 63

AUDIO SAMPLE RATES ............................................................................................. 68

MASTER CLOCK AND PHASE LOCKED LOOP (PLL) ............................................... 68

COMPANDING............................................................................................................ 70

GENERAL PURPOSE INPUT/OUTPUT...................................................................... 72

OUTPUT SWITCHING (JACK DETECT)..................................................................... 73

CONTROL INTERFACE.............................................................................................. 74

RESETTING THE CHIP .............................................................................................. 75

POWER SUPPLIES .................................................................................................... 76

RECOMMENDED POWER UP/DOWN SEQUENCE .................................................. 77

POWER MANAGEMENT ............................................................................................ 81

DIGITAL FILTER CHARACTERISTICS ...............................................................99

TERMINOLOGY .......................................................................................................... 99

DAC FILTER RESPONSES....................................................................................... 100

ADC FILTER RESPONSES....................................................................................... 100

HIGHPASS FILTER................................................................................................... 101

5-BAND EQUALISER ................................................................................................ 102

APPLICATION INFORMATION..........................................................................106

RECOMMENDED EXTERNAL COMPONENTS ........................................................ 106

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