WM8940GEFLSLASHV datasheet(3/85 Pages) WOLFSON

3 / 85 page

Pre-Production

WM8940

Pre-Production, Rev 3.0, February 2007

TABLE OF CONTENTS

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

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

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

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

TABLE OF CONTENTS .........................................................................................3

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

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

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

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

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

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

TERMINOLOGY .......................................................................................................... 10

POWER CONSUMPTION ....................................................................................11

SIGNAL TIMING REQUIREMENTS .....................................................................12

SYSTEM CLOCK TIMING ........................................................................................... 12

AUDIO INTERFACE TIMING – MASTER MODE ........................................................ 12

AUDIO INTERFACE TIMING – SLAVE MODE............................................................ 13

CONTROL INTERFACE TIMING – 3-WIRE MODE .................................................... 14

CONTROL INTERFACE TIMING – 2-WIRE MODE .................................................... 15

DEVICE DESCRIPTION .......................................................................................16

INTRODUCTION ......................................................................................................... 16

INPUT SIGNAL PATH ................................................................................................. 17

ANALOGUE TO DIGITAL CONVERTER (ADC).......................................................... 22

INPUT LIMITER / AUTOMATIC LEVEL CONTROL (ALC) .......................................... 27

OUTPUT SIGNAL PATH ............................................................................................. 40

ANALOGUE OUTPUTS............................................................................................... 44

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

DIGITAL AUDIO INTERFACES................................................................................... 50

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

MASTER CLOCK AND PHASE LOCKED LOOP (PLL) ............................................... 54

COMPANDING............................................................................................................ 57

GENERAL PURPOSE INPUT/OUTPUT...................................................................... 59

CONTROL INTERFACE.............................................................................................. 59

3-WIRE SERIAL CONTROL MODE ............................................................................ 61

READBACK IN 3-WIRE MODE ................................................................................... 61

2-WIRE SERIAL CONTROL MODE ............................................................................ 62

RESETTING THE CHIP .............................................................................................. 62

POWER SUPPLIES .................................................................................................... 62

POWER MANAGEMENT ............................................................................................ 64

POP MINIMISATION ................................................................................................... 65

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

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

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

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

HIGHPASS FILTER..................................................................................................... 80

NOTCH FILTERS AND LOW PASS FILTER............................................................... 81

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