WM8940CGEFLSLASHV datasheet(3/91 Pages) WOLFSON

3 / 91 page

Production Data

WM8940

PD, Rev 4.3, November 2011

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

AUDIO PATHS OVERVIEW ................................................................................ 11

POWER CONSUMPTION.................................................................................... 12

SIGNAL TIMING REQUIREMENTS .................................................................... 13

SYSTEM CLOCK TIMING ............................................................................................. 13

AUDIO INTERFACE TIMING – MASTER MODE.......................................................... 13

AUDIO INTERFACE TIMING – SLAVE MODE ............................................................. 14

CONTROL INTERFACE TIMING – 3-WIRE MODE ...................................................... 15

CONTROL INTERFACE TIMING – 2-WIRE MODE ...................................................... 16

DEVICE DESCRIPTION ...................................................................................... 17

INTRODUCTION ........................................................................................................... 17

INPUT SIGNAL PATH ................................................................................................... 18

ANALOGUE TO DIGITAL CONVERTER (ADC) ........................................................... 23

INPUT LIMITER / AUTOMATIC LEVEL CONTROL (ALC)............................................ 28

OUTPUT SIGNAL PATH ............................................................................................... 42

ANALOGUE OUTPUTS................................................................................................. 46

OUTPUT SWITCH......................................................................................................... 50

DIGITAL AUDIO INTERFACES..................................................................................... 53

AUDIO SAMPLE RATES............................................................................................... 57

MASTER CLOCK AND PHASE LOCKED LOOP (PLL) ................................................ 57

COMPANDING .............................................................................................................. 60

GENERAL PURPOSE INPUT/OUTPUT........................................................................ 62

CONTROL INTERFACE................................................................................................ 63

3-WIRE SERIAL CONTROL MODE .............................................................................. 64

READBACK IN 3-WIRE MODE ..................................................................................... 64

2-WIRE SERIAL CONTROL MODE .............................................................................. 65

RESETTING THE CHIP ................................................................................................ 66

POWER SUPPLIES....................................................................................................... 66

POWER MANAGEMENT .............................................................................................. 68

POP MINIMISATION ..................................................................................................... 69

DIGITAL FILTER CHARACTERISTICS .............................................................. 83

TERMINOLOGY ............................................................................................................ 83

DAC FILTER RESPONSES .......................................................................................... 84

ADC FILTER RESPONSES .......................................................................................... 84

HIGHPASS FILTER....................................................................................................... 85

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