WM8956
Preliminary Technical Data
TABLE OF CONTENTS
DESCRIPTION .......................................................................................................1
FEATURES.............................................................................................................1
APPLICATIONS .....................................................................................................1
TABLE OF CONTENTS .........................................................................................2
PIN CONFIGURATION...........................................................................................3
ORDERING INFORMATION ..................................................................................3
PIN DESCRIPTION ................................................................................................4
ABSOLUTE MAXIMUM RATINGS.........................................................................5
RECOMMENDED OPERATING CONDITIONS .....................................................5
ELECTRICAL CHARACTERISTICS ......................................................................6
OUTPUT PGA GAIN.............................................................................................10
TYPICAL POWER CONSUMPTION ....................................................................11
SIGNAL TIMING REQUIREMENTS.....................................................................12
SYSTEM CLOCK TIMING............................................................................................ 12
AUDIO INTERFACE TIMING – MASTER MODE......................................................... 12
AUDIO INTERFACE TIMING – SLAVE MODE ............................................................ 13
CONTROL INTERFACE TIMING – 2-WIRE MODE..................................................... 14
INTERNAL POWER ON RESET CIRCUIT ..........................................................15
DEVICE DESCRIPTION.......................................................................................17
INTRODUCTION.......................................................................................................... 17
INPUT SIGNAL PATH.................................................................................................. 18
OUTPUT SIGNAL PATH.............................................................................................. 26
ANALOGUE OUTPUTS ............................................................................................... 32
ENABLING THE OUTPUTS......................................................................................... 35
HEADPHONE OUTPUT............................................................................................... 36
CLASS D SPEAKER OUTPUTS.................................................................................. 37
VOLUME UPDATES .................................................................................................... 38
HEADPHONE JACK DETECT ..................................................................................... 40
THERMAL SHUTDOWN.............................................................................................. 42
GENERAL PURPOSE INPUT/OUTPUT ...................................................................... 42
DIGITAL AUDIO INTERFACE...................................................................................... 43
AUDIO INTERFACE CONTROL .................................................................................. 47
CLOCKING AND SAMPLE RATES.............................................................................. 50
CONTROL INTERFACE .............................................................................................. 57
POWER MANAGEMENT............................................................................................. 57
REGISTER MAP...................................................................................................60
REGISTER BITS BY ADDRESS.................................................................................. 61
DIGITAL FILTER CHARACTERISTICS...............................................................73
DAC FILTER RESPONSES ......................................................................................... 73
DE-EMPHASIS FILTER RESPONSES ........................................................................ 75
APPLICATIONS INFORMATION .........................................................................76
RECOMMENDED EXTERNAL COMPONENTS........................................................... 76
PACKAGE DRAWING..........................................................................................79
IMPORTANT NOTICE..........................................................................................80
ADDRESS:................................................................................................................... 80
PTD, July 2007, Rev 2.1
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
