WM8974 datasheet(2/89 Pages) CIRRUS

2 / 89 page

WM8974

Rev 4.7

TABLE OF CONTENTS

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

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

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

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

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

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

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

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) ............................................ 23

OUTPUT SIGNAL PATH ................................................................................................ 35

ANALOGUE OUTPUTS ................................................................................................. 42

OUTPUT SWITCH ......................................................................................................... 47

DIGITAL AUDIO INTERFACES ..................................................................................... 49

AUDIO SAMPLE RATES................................................................................................ 54

MASTER CLOCK AND PHASE LOCKED LOOP (PLL) ................................................. 55

GENERAL PURPOSE INPUT/OUTPUT ........................................................................ 57

CONTROL INTERFACE................................................................................................. 57

RESETTING THE CHIP ................................................................................................. 59

POWER SUPPLIES ....................................................................................................... 59

POWER MANAGEMENT ............................................................................................... 63

DIGITAL FILTER CHARACTERISTICS .............................................................. 78

TERMINOLOGY ............................................................................................................. 78

DAC FILTER RESPONSES ........................................................................................... 79

ADC FILTER RESPONSES ........................................................................................... 79

DE-EMPHASIS FILTER RESPONSES .......................................................................... 80

HIGH-PASS FILTER ...................................................................................................... 81

5-BAND EQUALISER..................................................................................................... 82

APPLICATIONS INFORMATION ........................................................................ 86

RECOMMENDED EXTERNAL COMPONENTS ............................................................ 86

PACKAGE DIAGRAM ......................................................................................... 87

IMPORTANT NOTICE ......................................................................................... 88

REVISION HISTORY ........................................................................................... 89

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