WM8955BL Wolfson Microelectronics, WM8955BL Datasheet - Page 2

• Manufacturer Part Number: WM8955BL
• Description: Stereo DAC
• Manufacturer: Wolfson Microelectronics

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WM8955BL
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
AUDIO PATHS OVERVIEW ................................................................................ 11
SIGNAL TIMING REQUIREMENTS .................................................................... 12
INTERNAL POWER ON RESET CIRCUIT .......................................................... 15
DEVICE DESCRIPTION ...................................................................................... 16
REGISTER MAP .................................................................................................. 37
DIGITAL FILTER CHARACTERISTICS .............................................................. 38
APPLICATIONS INFORMATION ........................................................................ 40
PACKAGE DIMENSIONS.................................................................................... 43
IMPORTANT NOTICE ......................................................................................... 44
TERMINOLOGY ............................................................................................................... 7
OUTPUT PGA’S LINEARITY ........................................................................................... 8
HEADPHONE OUTPUT THD VERSUS POWER ............................................................ 9
POWER CONSUMPTION .............................................................................................. 10
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
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
TERMINOLOGY ............................................................................................................. 38
DAC FILTER RESPONSES ........................................................................................... 38
RECOMMENDED EXTERNAL COMPONENTS ............................................................ 40
MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS.......................................... 41
LINE OUTPUT CONFIGURATION................................................................................. 41
HEADPHONE OUTPUT CONFIGURATION.................................................................. 42
EARPIECE OUTPUT CONFIGURATION ...................................................................... 42
ADDRESS: ..................................................................................................................... 44
TABLE OF CONTENTS
PD Rev 4.1 February 2007
Production Data
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