WM8973 Ver la hoja de datos (PDF) - Wolfson Microelectronics plc

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WM8973

Stereo CODEC for Portable Audio Applications

Wolfson Microelectronics plc 

Production Data

WM8973L

TABLE OF CONTENTS

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

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

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

BLOCK DIAGRAM ................................................................................................ 2

TABLE OF CONTENTS......................................................................................... 3

PIN CONFIGURATION .......................................................................................... 5

ORDERING INFORMATION.................................................................................. 5

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

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

RECOMMENDED OPERATION CONDITIONS..................................................... 7

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

OUTPUT PGA’S LINEARITY ......................................................................................... 10

HEADPHONE OUTPUT THD VERSUS POWER .......................................................... 11

SPEAKER THD AND NOISE VERSUS POWER ........................................................... 12

POWER CONSUMPTION .................................................................................... 13

SIGNAL TIMING REQUIREMENTS .................................................................... 14

SYSTEM CLOCK TIMING.............................................................................................. 14

AUDIO INTERFACE TIMING – MASTER MODE .......................................................... 14

AUDIO INTERFACE TIMING – SLAVE MODE .............................................................. 15

INTERNAL POWER ON RESET CIRCUIT .......................................................... 18

DEVICE DESCRIPTION ...................................................................................... 19

INTRODUCTION ............................................................................................................ 19

INPUT SIGNAL PATH .................................................................................................... 19

AUTOMATIC LEVEL CONTROL (ALC) ......................................................................... 26

OUTPUT SIGNAL PATH ................................................................................................ 30

ANALOGUE OUTPUTS ................................................................................................. 35

ENABLING THE OUTPUTS ........................................................................................... 37

HEADPHONE SWITCH.................................................................................................. 37

THERMAL SHUTDOWN ................................................................................................ 39

HEADPHONE OUTPUT ................................................................................................. 39

DIGITAL AUDIO INTERFACE........................................................................................ 40

AUDIO INTERFACE CONTROL .................................................................................... 44

CLOCKING AND SAMPLE RATES................................................................................ 46

CONTROL INTERFACE................................................................................................. 48

POWER SUPPLIES ....................................................................................................... 49

POWER MANAGEMENT ............................................................................................... 49

REGISTER MAP .................................................................................................. 52

DIGITAL FILTER CHARACTERISTICS .............................................................. 53

TERMINOLOGY ............................................................................................................. 53

DAC FILTER RESPONSES ........................................................................................... 54

ADC FILTER RESPONSES ........................................................................................... 55

DE-EMPHASIS FILTER RESPONSES .......................................................................... 56

HIGHPASS FILTER ....................................................................................................... 57

APPLICATIONS INFORMATION ........................................................................ 58

RECOMMENDED EXTERNAL COMPONENTS ............................................................ 58

LINE INPUT CONFIGURATION..................................................................................... 59

MICROPHONE INPUT CONFIGURATION .................................................................... 59

MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS.......................................... 59

POWER MANAGEMENT EXAMPLES ........................................................................... 60

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PD, Rev 4.5, December 2011

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