WM8971L datasheet(2/61 Pages) WOLFSON

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WM8971L

Production Data

PD Rev 4.1 August 2005

TABLE OF CONTENTS

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

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

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

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

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

PIN CONFIGURATION...........................................................................................4

ORDERING INFORMATION ..................................................................................4

PIN DESCRIPTION ................................................................................................5

ABSOLUTE MAXIMUM RATINGS .........................................................................6

RECOMMENDED OPERATION CONDITIONS .....................................................6

ELECTRICAL CHARACTERISTICS ......................................................................7

OUTPUT PGA’S LINEARITY ......................................................................................... 9

HEADPHONE OUTPUT THD VERSUS POWER......................................................... 10

SPEAKER THD AND NOISE VERSUS POWER ......................................................... 11

POWER CONSUMPTION ....................................................................................12

SIGNAL TIMING REQUIREMENTS .....................................................................13

SYSTEM CLOCK TIMING............................................................................................ 13

AUDIO INTERFACE TIMING – MASTER MODE ......................................................... 13

AUDIO INTERFACE TIMING – SLAVE MODE ............................................................ 14

INTERNAL POWER ON RESET CIRCUIT ..........................................................17

DEVICE DESCRIPTION .......................................................................................18

INTRODUCTION.......................................................................................................... 18

INPUT SIGNAL PATH.................................................................................................. 18

AUTOMATIC LEVEL CONTROL (ALC) ....................................................................... 25

OUTPUT SIGNAL PATH.............................................................................................. 28

ANALOGUE OUTPUTS ............................................................................................... 33

ENABLING THE OUTPUTS ......................................................................................... 35

HEADPHONE SWITCH ............................................................................................... 35

THERMAL SHUTDOWN .............................................................................................. 37

HEADPHONE OUTPUT ............................................................................................... 37

DIGITAL AUDIO INTERFACE...................................................................................... 38

AUDIO INTERFACE CONTROL .................................................................................. 42

CLOCKING AND SAMPLE RATES .............................................................................. 44

CONTROL INTERFACE .............................................................................................. 46

POWER SUPPLIES ..................................................................................................... 47

POWER MANAGEMENT ............................................................................................. 47

DIGITAL FILTER CHARACTERISTICS ...............................................................51

TERMINOLOGY........................................................................................................... 51

DAC FILTER RESPONSES ......................................................................................... 52

ADC FILTER RESPONSES ......................................................................................... 53

DE-EMPHASIS FILTER RESPONSES ........................................................................ 54

HIGHPASS FILTER ..................................................................................................... 55

APPLICATIONS INFORMATION .........................................................................56

RECOMMENDED EXTERNAL COMPONENTS........................................................... 56

LINE INPUT CONFIGURATION................................................................................... 57

MICROPHONE INPUT CONFIGURATION .................................................................. 57

MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS ........................................ 57

POWER MANAGEMENT EXAMPLES ......................................................................... 58

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