WM8950 datasheet(2/52 Pages) WOLFSON

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WM8950

Preliminary Technical Data

PTD Rev 2.1 June 2005

TABLE OF CONTENTS

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

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

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

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

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

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

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

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

TERMINOLOGY ............................................................................................................ 7

SIGNAL TIMING REQUIREMENTS .......................................................................8

SYSTEM CLOCK TIMING ............................................................................................. 8

AUDIO INTERFACE TIMING – MASTER MODE .......................................................... 8

AUDIO INTERFACE TIMING – SLAVE MODE.............................................................. 9

CONTROL INTERFACE TIMING – 3-WIRE MODE .................................................... 10

CONTROL INTERFACE TIMING – 2-WIRE MODE .................................................... 11

DEVICE DESCRIPTION .......................................................................................12

INTRODUCTION ......................................................................................................... 12

INPUT SIGNAL PATH ................................................................................................. 13

ANALOGUE TO DIGITAL CONVERTER (ADC).......................................................... 18

INPUT LIMITER / AUTOMATIC LEVEL CONTROL (ALC) .......................................... 21

DIGITAL AUDIO INTERFACES................................................................................... 29

AUDIO SAMPLE RATES ............................................................................................. 35

MASTER CLOCK AND PHASE LOCKED LOOP (PLL) ............................................... 35

GENERAL PURPOSE INPUT/OUTPUT...................................................................... 37

CONTROL INTERFACE.............................................................................................. 38

RESETTING THE CHIP........................................................................................39

POWER SUPPLIES .................................................................................................... 39

POWER MANAGEMENT ............................................................................................ 39

DIGITAL FILTER CHARACTERISTICS ...............................................................42

TERMINOLOGY .......................................................................................................... 42

ADC FILTER RESPONSES .................................................................................43

DE-EMPHASIS FILTER RESPONSES........................................................................ 44

HIGHPASS FILTER..............................................................................................45

5-BAND EQUALISER .................................................................................................. 46

APPLICATIONS INFORMATION .........................................................................50

RECOMMENDED EXTERNAL COMPONENTS .......................................................... 50

PACKAGE DIAGRAM ..........................................................................................51

IMPORTANT NOTICE ..........................................................................................52

ADDRESS ................................................................................................................... 52

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