WM8994 datasheet(2/359 Pages) WOLFSON

2 / 359 page

WM8994

Production Data

PD, April 2012, Rev 4.4

TABLE OF CONTENTS

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

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

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

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

BLOCK DIAGRAM ................................................................................................ 6

PIN CONFIGURATION .......................................................................................... 7

ORDERING INFORMATION.................................................................................. 7

PIN DESCRIPTION................................................................................................ 8

ABSOLUTE MAXIMUM RATINGS ...................................................................... 11

RECOMMENDED OPERATING CONDITIONS................................................... 12

THERMAL PERFORMANCE............................................................................... 13

ELECTRICAL CHARACTERISTICS ................................................................... 14

INPUT SIGNAL LEVEL .................................................................................................. 14

INPUT PIN RESISTANCE.............................................................................................. 15

PROGRAMMABLE GAINS............................................................................................. 17

OUTPUT DRIVER CHARACTERISTICS ....................................................................... 18

ADC INPUT PATH PERFORMANCE............................................................................. 19

DAC OUTPUT PATH PERFORMANCE......................................................................... 20

BYPASS PATH PERFORMANCE.................................................................................. 23

MULTI-PATH CROSSTALK ........................................................................................... 25

DIGITAL INPUT / OUTPUT ............................................................................................ 27

DIGITAL FILTER CHARACTERISTICS ......................................................................... 27

MICROPHONE BIAS CHARACTERISTICS................................................................... 28

MISCELLANEOUS CHARACTERISTICS ...................................................................... 29

TERMINOLOGY............................................................................................................. 30

TYPICAL PERFORMANCE................................................................................. 31

TYPICAL POWER CONSUMPTION .............................................................................. 31

TYPICAL SIGNAL LATENCY......................................................................................... 32

SPEAKER DRIVER PERFORMANCE ........................................................................... 33

SIGNAL TIMING REQUIREMENTS .................................................................... 34

SYSTEM CLOCKS & FREQUENCY LOCKED LOOP (FLL).......................................... 34

AUDIO INTERFACE TIMING ......................................................................................... 35

DIGITAL MICROPHONE (DMIC) INTERFACE TIMING.................................................................................................. 35

DIGITAL AUDIO INTERFACE - MASTER MODE ........................................................................................................... 36

DIGITAL AUDIO INTERFACE - SLAVE MODE............................................................................................................... 37

DIGITAL AUDIO INTERFACE - TDM MODE .................................................................................................................. 38

CONTROL INTERFACE TIMING ................................................................................... 39

2-WIRE (I2C) CONTROL MODE ..................................................................................................................................... 39

3-WIRE (SPI) CONTROL MODE..................................................................................................................................... 40

4-WIRE (SPI) CONTROL MODE..................................................................................................................................... 41

DEVICE DESCRIPTION ...................................................................................... 42

INTRODUCTION............................................................................................................ 42

ANALOGUE INPUT SIGNAL PATH ............................................................................... 44

MICROPHONE INPUTS .................................................................................................................................................. 45

MICROPHONE BIAS CONTROL .................................................................................................................................... 45

MICROPHONE CURRENT DETECT .............................................................................................................................. 46

LINE AND VOICE CODEC INPUTS ................................................................................................................................ 47

INPUT PGA ENABLE ...................................................................................................................................................... 48

INPUT PGA CONFIGURATION ...................................................................................................................................... 48

INPUT PGA VOLUME CONTROL................................................................................................................................... 49

INPUT MIXER ENABLE................................................................................................................................................... 52

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