WM8955L
Production 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
RECOMMENDED OPERATING CONDITIONS .....................................................5
ELECTRICAL CHARACTERISTICS ......................................................................6
TERMINOLOGY............................................................................................................. 7
OUTPUT PGA’S LINEARITY ......................................................................................... 8
HEADPHONE OUTPUT THD VERSUS POWER........................................................... 9
SPEAKER THD AND NOISE VERSUS POWER ......................................................... 10
POWER CONSUMPTION ....................................................................................11
AUDIO PATHS OVERVIEW.................................................................................12
SIGNAL TIMING REQUIREMENTS.....................................................................13
SYSTEM CLOCK TIMING............................................................................................ 13
AUDIO INTERFACE TIMING – MASTER MODE......................................................... 13
AUDIO INTERFACE TIMING – SLAVE MODE ............................................................ 14
CONTROL INTERFACE TIMING – 3-WIRE MODE..................................................... 14
CONTROL INTERFACE TIMING – 2-WIRE MODE..................................................... 15
INTERNAL POWER ON RESET CIRCUIT ..........................................................16
DEVICE DESCRIPTION.......................................................................................17
INTRODUCTION.......................................................................................................... 17
SIGNAL PATH ............................................................................................................. 17
LINE INPUTS AND OUTPUT MIXERS ........................................................................ 21
ANALOGUE OUTPUTS ............................................................................................... 24
DIGITAL AUDIO INTERFACE...................................................................................... 28
MASTER CLOCK AND PHASE LOCKED LOOP ......................................................... 31
AUDIO SAMPLE RATES.............................................................................................. 33
CONTROL INTERFACE .............................................................................................. 35
POWER SUPPLIES..................................................................................................... 36
POWER MANAGEMENT............................................................................................. 37
REGISTER MAP...................................................................................................39
DIGITAL FILTER CHARACTERISTICS...............................................................40
TERMINOLOGY........................................................................................................... 40
DAC FILTER RESPONSES ......................................................................................... 40
APPLICATIONS INFORMATION .........................................................................42
RECOMMENDED EXTERNAL COMPONENTS........................................................... 42
MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS ........................................ 43
LINE OUTPUT CONFIGURATION............................................................................... 43
HEADPHONE OUTPUT CONFIGURATION ................................................................ 44
SPEAKER OUTPUT CONFIGURATION...................................................................... 44
PACKAGE DIMENSIONS ....................................................................................45
IMPORTANT NOTICE..........................................................................................46
ADDRESS:................................................................................................................... 46
PD Rev 4.2 March 2006
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
