WM8950
Preliminary Technical Data
TABLE OF CONTENTS
DESCRIPTION .......................................................................................................1
FEATURES.............................................................................................................1
APPLICATIONS .....................................................................................................1
TABLE OF CONTENTS .........................................................................................2
PIN CONFIGURATION...........................................................................................3
ORDERING INFORMATION ..................................................................................3
RECOMMENDED OPERATING CONDITIONS .....................................................5
ELECTRICAL CHARACTERISTICS ......................................................................6
TERMINOLOGY ............................................................................................................ 7
SIGNAL TIMING REQUIREMENTS .......................................................................8
SYSTEM CLOCK TIMING ............................................................................................. 8
AUDIO INTERFACE TIMING – MASTER MODE .......................................................... 8
AUDIO INTERFACE TIMING – SLAVE MODE.............................................................. 9
CONTROL INTERFACE TIMING – 3-WIRE MODE .................................................... 10
CONTROL INTERFACE TIMING – 2-WIRE MODE .................................................... 11
DEVICE DESCRIPTION.......................................................................................12
INTRODUCTION ......................................................................................................... 12
INPUT SIGNAL PATH ................................................................................................. 13
ANALOGUE TO DIGITAL CONVERTER (ADC).......................................................... 18
INPUT LIMITER / AUTOMATIC LEVEL CONTROL (ALC) .......................................... 21
DIGITAL AUDIO INTERFACES................................................................................... 29
AUDIO SAMPLE RATES ............................................................................................. 35
MASTER CLOCK AND PHASE LOCKED LOOP (PLL) ............................................... 35
GENERAL PURPOSE INPUT/OUTPUT...................................................................... 37
CONTROL INTERFACE.............................................................................................. 38
RESETTING THE CHIP........................................................................................39
POWER SUPPLIES .................................................................................................... 39
POWER MANAGEMENT ............................................................................................ 39
REGISTER MAP...................................................................................................41
DIGITAL FILTER CHARACTERISTICS ...............................................................42
TERMINOLOGY .......................................................................................................... 42
ADC FILTER RESPONSES .................................................................................43
DE-EMPHASIS FILTER RESPONSES........................................................................ 44
HIGHPASS FILTER..............................................................................................45
5-BAND EQUALISER .................................................................................................. 46
APPLICATIONS INFORMATION .........................................................................50
RECOMMENDED EXTERNAL COMPONENTS .......................................................... 50
PACKAGE DIAGRAM ..........................................................................................51
IMPORTANT NOTICE ..........................................................................................52
ADDRESS ................................................................................................................... 52
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PTD Rev 2.1 June 2005
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