WM8731

Advanced Information

WOLFSON MICROELECTRONICS LTD

AI Rev 2.0 February 2001

2

TABLE OF CONTENTS

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

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

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

BLOCK DIAGRAM ................................................................................................. 1

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

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

PIN DESCRIPTION ................................................................................................ 6

ABSOLUTE MAXIMUM RATINGS......................................................................... 7

RECOMMENDED OPERATING CONDITIONS ..................................................... 7

ELECTRICAL CHARACTERISTICS ...................................................................... 8

TERMINOLOGY................................................................................................... 10

POWER CONSUMPTION .................................................................................... 11

MASTER CLOCK TIMING ................................................................................... 12

DIGITAL AUDIO INTERFACE – MASTER MODE

13

DIGITAL AUDIO INTERFACE – SLAVE MODE

14

MPU INTERFACE TIMING

15

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

INTRODUCTION

17

AUDIO SIGNAL PATH

18

LINE INPUTS .......................................................................................................................................... 18

MICROPHONE INPUT ............................................................................................................................ 20

MICROPHONE BIAS............................................................................................................................... 21

ADC ......................................................................................................................................................... 22

ADC FILTERS ......................................................................................................................................... 23

DAC FILTERS ......................................................................................................................................... 23

DAC ......................................................................................................................................................... 24

LINE OUTPUTS ...................................................................................................................................... 24

HEADPHONE AMPLIFIER...................................................................................................................... 26

BYPASS MODE ...................................................................................................................................... 28

SIDETONE MODE................................................................................................................................... 29

DEVICE OPERATION

30

DEVICE RESETTING .............................................................................................................................. 30

CLOCKING SCHEMES ........................................................................................................................... 30

CORE CLOCK......................................................................................................................................... 30

CRYSTAL OSCILLATOR........................................................................................................................ 31