WM8955BL
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
ABSOLUTE MAXIMUM RATINGS........................................................................ 5
RECOMMENDED OPERATING CONDITIONS..................................................... 5
ELECTRICAL CHARACTERISTICS ..................................................................... 6
TERMINOLOGY............................................................................................................... 7
OUTPUT PGA’S LINEARITY ........................................................................................... 8
HEADPHONE OUTPUT THD VERSUS POWER ............................................................ 9
POWER CONSUMPTION.............................................................................................. 10
AUDIO PATHS OVERVIEW ................................................................................ 11
SIGNAL TIMING REQUIREMENTS .................................................................... 12
SYSTEM CLOCK TIMING.............................................................................................. 12
AUDIO INTERFACE TIMING – MASTER MODE .......................................................... 12
AUDIO INTERFACE TIMING – SLAVE MODE.............................................................. 13
CONTROL INTERFACE TIMING – 3-WIRE MODE....................................................... 13
CONTROL INTERFACE TIMING – 2-WIRE MODE....................................................... 14
INTERNAL POWER ON RESET CIRCUIT.......................................................... 15
DEVICE DESCRIPTION ...................................................................................... 16
INTRODUCTION............................................................................................................ 16
SIGNAL PATH................................................................................................................ 16
LINE INPUTS AND OUTPUT MIXERS .......................................................................... 20
ANALOGUE OUTPUTS ................................................................................................. 23
DIGITAL AUDIO INTERFACE........................................................................................ 26
MASTER CLOCK AND PHASE LOCKED LOOP........................................................... 29
AUDIO SAMPLE RATES................................................................................................ 31
CONTROL INTERFACE................................................................................................. 33
POWER SUPPLIES ....................................................................................................... 34
POWER MANAGEMENT ............................................................................................... 35
REGISTER MAP.................................................................................................. 37
DIGITAL FILTER CHARACTERISTICS .............................................................. 38
TERMINOLOGY............................................................................................................. 38
DAC FILTER RESPONSES ........................................................................................... 38
APPLICATIONS INFORMATION ........................................................................ 40
RECOMMENDED EXTERNAL COMPONENTS............................................................ 40
MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS.......................................... 41
LINE OUTPUT CONFIGURATION................................................................................. 41
HEADPHONE OUTPUT CONFIGURATION.................................................................. 42
EARPIECE OUTPUT CONFIGURATION ...................................................................... 42
PACKAGE DIMENSIONS.................................................................................... 43
IMPORTANT NOTICE ......................................................................................... 44
ADDRESS:..................................................................................................................... 44
PD Rev 4.1 February 2007
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
