WM8972L Просмотр технического описания (PDF) - Wolfson Microelectronics plc

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WM8972L

Mono CODEC for Portable Audio Applications

Wolfson Microelectronics plc 

WM8972L

Preliminary Technical Data

TABLE OF CONTENTS

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

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

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

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

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

PIN CONFIGURATION...........................................................................................3

ORDERING INFORMATION ..................................................................................3

PIN DESCRIPTION ................................................................................................4

ABSOLUTE MAXIMUM RATINGS.........................................................................5

RECOMMENDED OPERATION CONDITIONS .....................................................5

ELECTRICAL CHARACTERISTICS ......................................................................6

OUTPUT PGA’S LINEARITY ......................................................................................... 7

POWER CONSUMPTION ......................................................................................8

SIGNAL TIMING REQUIREMENTS .......................................................................9

SYSTEM CLOCK TIMING.............................................................................................. 9

AUDIO INTERFACE TIMING – MASTER MODE ........................................................... 9

AUDIO INTERFACE TIMING – SLAVE MODE ............................................................ 10

DEVICE DESCRIPTION.......................................................................................13

INTRODUCTION.......................................................................................................... 13

INPUT SIGNAL PATH.................................................................................................. 13

AUTOMATIC LEVEL CONTROL (ALC) ....................................................................... 18

OUTPUT SIGNAL PATH.............................................................................................. 21

ANALOGUE OUTPUTS ............................................................................................... 26

ENABLING THE OUTPUTS ......................................................................................... 27

THERMAL SHUTDOWN .............................................................................................. 27

DIGITAL AUDIO INTERFACE...................................................................................... 28

AUDIO INTERFACE CONTROL .................................................................................. 31

CLOCKING AND SAMPLE RATES .............................................................................. 32

CONTROL INTERFACE .............................................................................................. 34

POWER SUPPLIES ..................................................................................................... 35

POWER MANAGEMENT ............................................................................................. 36

REGISTER MAP .......................................................................................................... 38

DIGITAL FILTER CHARACTERISTICS ...............................................................39

TERMINOLOGY........................................................................................................... 39

DAC FILTER RESPONSES ......................................................................................... 40

ADC FILTER RESPONSES ......................................................................................... 41

DE-EMPHASIS FILTER RESPONSES ........................................................................ 42

HIGHPASS FILTER ..................................................................................................... 43

APPLICATIONS INFORMATION .........................................................................44

RECOMMENDED EXTERNAL COMPONENTS........................................................... 44

LINE INPUT CONFIGURATION................................................................................... 45

MICROPHONE INPUT CONFIGURATION .................................................................. 45

MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS ........................................ 46

POWER MANAGEMENT EXAMPLES ......................................................................... 46

IMPORTANT NOTICE ..........................................................................................48

ADDRESS:................................................................................................................... 48

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PTD Rev 2.2 June 2004

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