WM8974 datasheet(2/63 Pages) WOLFSON

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WM8974

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PP Rev 1.1 September 2004

TABLE OF CONTENTS

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

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

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

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

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

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

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

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

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

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

SIGNAL TIMING REQUIREMENTS .......................................................................9

SYSTEM CLOCK TIMING ............................................................................................. 9

AUDIO INTERFACE TIMING – MASTER MODE .......................................................... 9

AUDIO INTERFACE TIMING – SLAVE MODE............................................................ 10

CONTROL INTERFACE TIMING – 3-WIRE MODE .................................................... 11

CONTROL INTERFACE TIMING – 2-WIRE MODE .................................................... 12

DEVICE DESCRIPTION .......................................................................................13

INTRODUCTION ......................................................................................................... 13

INPUT SIGNAL PATH ................................................................................................. 14

ANALOGUE TO DIGITAL CONVERTER (ADC).......................................................... 19

INPUT LIMITER / AUTOMATIC LEVEL CONTROL (ALC) .......................................... 22

OUTPUT SIGNAL PATH ............................................................................................. 26

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

OUTPUT SWITCH ...................................................................................................... 38

DIGITAL AUDIO INTERFACES................................................................................... 40

AUDIO SAMPLE RATES ............................................................................................. 46

MASTER CLOCK AND PHASE LOCKED LOOP (PLL) ............................................... 47

GENERAL PURPOSE INPUT/OUTPUT...................................................................... 49

CONTROL INTERFACE.............................................................................................. 49

RESETTING THE CHIP........................................................................................50

POWER SUPPLIES .................................................................................................... 50

POWER MANAGEMENT ............................................................................................ 51

DIGITAL FILTER CHARACTERISTICS ...............................................................53

TERMINOLOGY .......................................................................................................... 53

DAC FILTER RESPONSES .................................................................................54

ADC FILTER RESPONSES .................................................................................54

DE-EMPHASIS FILTER RESPONSES ................................................................55

HIGHPASS FILTER..............................................................................................56

5-BAND EQUALISER...........................................................................................57

APPLICATIONS INFORMATION .........................................................................61

RECOMMENDED EXTERNAL COMPONENTS .......................................................... 61

PACKAGE DIAGRAM ..........................................................................................62

IMPORTANT NOTICE ..........................................................................................63

ADDRESS ................................................................................................................... 63

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