WM8940CGEFLSLASHV datasheet(3/88 Pages) CIRRUS

3 / 88 page

WM8940

Rev 4.4

TABLE OF CONTENTS

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

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

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

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

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

PIN CONFIGURATION ................................................................................................... 6

ORDERING INFORMATION........................................................................................... 6

PIN DESCRIPTION......................................................................................................... 7

ABSOLUTE MAXIMUM RATINGS ................................................................................. 8

RECOMMENDED OPERATING CONDITIONS.............................................................. 8

ELECTRICAL CHARACTERISTICS .............................................................................. 9

TERMINOLOGY .......................................................................................................................11

AUDIO PATHS OVERVIEW ......................................................................................... 12

POWER CONSUMPTION............................................................................................. 13

SIGNAL TIMING REQUIREMENTS ............................................................................. 14

SYSTEM CLOCK TIMING........................................................................................................14

AUDIO INTERFACE TIMING

– MASTER MODE ....................................................................15

AUDIO INTERFACE TIMING

– SLAVE MODE........................................................................16

CONTROL INTERFACE TIMING

– 3-WIRE MODE.................................................................17

CONTROL INTERFACE TIMING

– 2-WIRE MODE.................................................................18

DEVICE DESCRIPTION ............................................................................................... 19

INTRODUCTION ......................................................................................................................19

FEATURES....................................................................................................................................................................................19

MICROPHONE INPUTS ................................................................................................................................................................19

PGA AND ALC OPERATION ........................................................................................................................................................19

AUX INPUT....................................................................................................................................................................................19

ADC ...............................................................................................................................................................................................19

HI-FI DAC ......................................................................................................................................................................................19

DIGITAL FILTERING .....................................................................................................................................................................19

OUTPUT MIXING AND VOLUME ADJUST ..................................................................................................................................19

AUDIO INTERFACES....................................................................................................................................................................19

CONTROL INTERFACES .............................................................................................................................................................20

CLOCKING SCHEMES .................................................................................................................................................................20

POWER CONTROL.......................................................................................................................................................................20

INPUT SIGNAL PATH ..............................................................................................................20

MICROPHONE INPUTS ................................................................................................................................................................20

INPUT PGA VOLUME CONTROL.................................................................................................................................................22

AUXILIARY INPUT ........................................................................................................................................................................22

INPUT BOOST...............................................................................................................................................................................23

MICROPHONE BIASING CIRCUIT ...............................................................................................................................................24

ANALOGUE TO DIGITAL CONVERTER (ADC) ......................................................................25

ADC DIGITAL FILTERS ................................................................................................................................................................25

SELECTABLE HIGH PASS FILTER..............................................................................................................................................26

PROGRAMMABLE NOTCH FILTERS ..........................................................................................................................................27

DIGITAL ADC VOLUME CONTROL .............................................................................................................................................29

INPUT LIMITER / AUTOMATIC LEVEL CONTROL (ALC) ......................................................29

NORMAL MODE............................................................................................................................................................................32

LIMITER MODE .............................................................................................................................................................................32

ATTACK AND DECAY TIMES.......................................................................................................................................................33

NORMAL MODE............................................................................................................................................................................33

LIMITER MODE .............................................................................................................................................................................34

WM8940CGEFL/V Datasheet(PDF) 3 Page - Cirrus Logic

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