WM8945 datasheet(2/169 Pages) WOLFSON

2 / 169 page

WM8945

Production Data

PD, May 2011, Rev 4.1

TABLE OF CONTENTS

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

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

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

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

BLOCK DIAGRAM ................................................................................................ 5

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

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

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

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

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

THERMAL PERFORMANCE................................................................................. 9

ELECTRICAL CHARACTERISTICS ................................................................... 10

TERMINOLOGY............................................................................................................. 13

TYPICAL PERFORMANCE ................................................................................. 14

POWER CONSUMPTION .............................................................................................. 15

AUDIO SIGNAL PATHS DIAGRAM .................................................................... 16

SIGNAL TIMING REQUIREMENTS .................................................................... 17

SYSTEM CLOCK TIMING.............................................................................................. 17

AUDIO INTERFACE TIMING ......................................................................................... 17

MASTER MODE ........................................................................................................................................17

SLAVE MODE ...........................................................................................................................................18

CONTROL INTERFACE TIMING ................................................................................... 19

DEVICE DESCRIPTION ...................................................................................... 22

INTRODUCTION............................................................................................................ 22

ANALOGUE INPUT SIGNAL PATH ............................................................................... 23

INPUT PGA ENABLE ................................................................................................................................24

INPUT PGA CONFIGURATION ................................................................................................................24

MICROPHONE BIAS CONTROL ..............................................................................................................25

INPUT PGA GAIN CONTROL ...................................................................................................................25

DIGITAL MICROPHONE INTERFACE .......................................................................... 27

ANALOGUE-TO-DIGITAL CONVERTER (ADC)............................................................ 28

ADC VOLUME CONTROL.........................................................................................................................28

ADC HIGH PASS FILTER .........................................................................................................................31

DSP CORE..................................................................................................................... 32

DSP CONFIGURATION MODES ..............................................................................................................32

LOW-PASS / HIGH-PASS FILTER (LPF/HPF)..........................................................................................33

5-NOTCH FILTER .....................................................................................................................................34

DF1 FILTER...............................................................................................................................................35

RETUNE

TM FILTER ...................................................................................................................................35

5-BAND EQ ...............................................................................................................................................36

DYNAMIC RANGE CONTROL (DRC).......................................................................................................36

SIGNAL ENHANCEMENT REGISTER CONTROLS.................................................................................36

DYNAMIC RANGE CONTROL (DRC) ........................................................................... 37

DRC COMPRESSION / EXPANSION / LIMITING.....................................................................................38

GAIN LIMITS .............................................................................................................................................40

GAIN READBACK .....................................................................................................................................41

DYNAMIC CHARACTERISTICS ...............................................................................................................42

ANTI-CLIP CONTROL...............................................................................................................................43

QUICK-RELEASE CONTROL ...................................................................................................................44

DRC INITIAL VALUE .................................................................................................................................44

WM8945 数据表(PDF) 2 Page - Wolfson Microelectronics plc

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