WM8985GEFLSLASHR datasheet(3/118 Pages) WOLFSON

3 / 118 page

Pre-Production

WM8985

PP, Rev 3.5, January 2007

TABLE OF CONTENTS

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

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

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

BLOCK DIAGRAM .................................................................................................2

PIN CONFIGURATION...........................................................................................5

ORDERING INFORMATION ..................................................................................5

PIN DESCRIPTION ................................................................................................6

ABSOLUTE MAXIMUM RATINGS .........................................................................7

RECOMMENDED OPERATING CONDITIONS .....................................................7

ELECTRICAL CHARACTERISTICS ......................................................................8

TERMINOLOGY .......................................................................................................... 14

AUDIO PATHS OVERVIEW .................................................................................16

SIGNAL TIMING REQUIREMENTS .....................................................................17

SYSTEM CLOCK TIMING ........................................................................................... 17

AUDIO INTERFACE TIMING – MASTER MODE ........................................................ 17

AUDIO INTERFACE TIMING – SLAVE MODE............................................................ 18

CONTROL INTERFACE TIMING – 3-WIRE MODE .................................................... 19

CONTROL INTERFACE TIMING – 2-WIRE MODE .................................................... 20

INTERNAL POWER ON RESET CIRCUIT ..........................................................21

RECOMMENDED POWER UP/DOWN SEQUENCE .................................................. 23

DEVICE DESCRIPTION .......................................................................................27

INTRODUCTION ......................................................................................................... 27

INPUT SIGNAL PATH ................................................................................................. 28

ANALOGUE TO DIGITAL CONVERTER (ADC).......................................................... 38

INPUT LIMITER / AUTOMATIC LEVEL CONTROL (ALC) .......................................... 42

LIMITER MODE........................................................................................................... 45

OUTPUT SIGNAL PATH ............................................................................................. 54

3D STEREO ENHANCEMENT .................................................................................... 61

ANALOGUE OUTPUTS............................................................................................... 61

DIGITAL AUDIO INTERFACES................................................................................... 74

AUDIO SAMPLE RATES............................................................................................. 78

MASTER CLOCK AND PHASE LOCKED LOOP (PLL) ............................................... 79

COMPANDING............................................................................................................ 81

GENERAL PURPOSE INPUT/OUTPUT...................................................................... 83

OUTPUT SWITCHING (JACK DETECT)..................................................................... 84

CONTROL INTERFACE.............................................................................................. 85

RESETTING THE CHIP .............................................................................................. 86

POWER SUPPLIES .................................................................................................... 86

POWER MANAGEMENT ............................................................................................ 87

DIGITAL FILTER CHARACTERISTICS .............................................................109

TERMINOLOGY ........................................................................................................ 109

DAC FILTER RESPONSES....................................................................................... 110

ADC FILTER RESPONSES....................................................................................... 110

HIGHPASS FILTER................................................................................................... 111

5-BAND EQUALISER ................................................................................................ 112

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