WM8978GEFLSLASHV datasheet(2/119 Pages) WOLFSON

2 / 119 page

WM8978

Pre-Production

PP Rev 3.0 May 2006

TABLE OF CONTENTS

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

BLOCK DIAGRAM .................................................................................................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

INTERNAL POWER ON RESET CIRCUIT ..........................................................19

RECOMMENDED POWER UP/DOWN SEQUENCE .................................................. 21

DEVICE DESCRIPTION .......................................................................................25

INTRODUCTION ......................................................................................................... 25

INPUT SIGNAL PATH ................................................................................................. 27

ANALOGUE TO DIGITAL CONVERTER (ADC).......................................................... 34

INPUT LIMITER / AUTOMATIC LEVEL CONTROL (ALC) .......................................... 40

OUTPUT SIGNAL PATH ............................................................................................. 52

3D STEREO ENHANCEMENT .................................................................................... 59

ANALOGUE OUTPUTS............................................................................................... 59

DIGITAL AUDIO INTERFACES................................................................................... 75

AUDIO SAMPLE RATES ............................................................................................. 80

MASTER CLOCK AND PHASE LOCKED LOOP (PLL) ............................................... 80

COMPANDING............................................................................................................ 83

GENERAL PURPOSE INPUT/OUTPUT...................................................................... 85

OUTPUT SWITCHING (JACK DETECT)..................................................................... 86

CONTROL INTERFACE.............................................................................................. 88

RESETTING THE CHIP .............................................................................................. 89

POWER SUPPLIES .................................................................................................... 89

POWER MANAGEMENT ............................................................................................ 90

DIGITAL FILTER CHARACTERISTICS .............................................................110

TERMINOLOGY ........................................................................................................ 110

DAC FILTER RESPONSES....................................................................................... 111

ADC FILTER RESPONSES....................................................................................... 111

HIGHPASS FILTER................................................................................................... 112

5-BAND EQUALISER ................................................................................................ 113

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