WM8946 datasheet(2/173 Pages) CIRRUS

2 / 173 page

WM8946

Rev 4.5

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

INPUT PATH / OUTPUT PATH PERFORMANCE ................................................................... 14

TYPICAL 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 .................................................................................... 28

ANALOGUE-TO-DIGITAL CONVERTER (ADC)...................................................................... 29

ADC VOLUME CONTROL.............................................................................................................................................................30

ADC HIGH PASS FILTER .............................................................................................................................................................32

DSP CORE............................................................................................................................... 33

DSP CONFIGURATION MODES ..................................................................................................................................................33

LOW-PASS / HIGH-PASS FILTER (LPF/HPF)..............................................................................................................................34

3D SURROUND.............................................................................................................................................................................35

5-NOTCH FILTER..........................................................................................................................................................................36

DF1 FILTER...................................................................................................................................................................................37

RETUNETM FILTER........................................................................................................................................................................37

5-BAND EQ....................................................................................................................................................................................38

DYNAMIC RANGE CONTROL (DRC) ...........................................................................................................................................38

SIGNAL ENHANCEMENT REGISTER CONTROLS.....................................................................................................................39

DYNAMIC RANGE CONTROL (DRC) ..................................................................................... 40

DRC COMPRESSION / EXPANSION / LIMITING.........................................................................................................................41

GAIN LIMITS..................................................................................................................................................................................43

GAIN READBACK .........................................................................................................................................................................44

DYNAMIC CHARACTERISTICS ...................................................................................................................................................44

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