WM8974 Просмотр технического описания (PDF) - Wolfson Microelectronics plc
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WM8974 Datasheet PDF : 63 Pages
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WM8974
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TABLE OF CONTENTS
DESCRIPTION .......................................................................................................1
FEATURES.............................................................................................................1
APPLICATIONS .....................................................................................................1
TABLE OF CONTENTS .........................................................................................2
PIN CONFIGURATION...........................................................................................3
ORDERING INFORMATION ..................................................................................3
ABSOLUTE MAXIMUM RATINGS.........................................................................5
RECOMMENDED OPERATING CONDITIONS .....................................................5
ELECTRICAL CHARACTERISTICS ......................................................................6
TERMINOLOGY ............................................................................................................ 8
SIGNAL TIMING REQUIREMENTS .......................................................................9
SYSTEM CLOCK TIMING ............................................................................................. 9
AUDIO INTERFACE TIMING – MASTER MODE .......................................................... 9
AUDIO INTERFACE TIMING – SLAVE MODE............................................................ 10
CONTROL INTERFACE TIMING – 3-WIRE MODE .................................................... 11
CONTROL INTERFACE TIMING – 2-WIRE MODE .................................................... 12
DEVICE DESCRIPTION.......................................................................................13
INTRODUCTION ......................................................................................................... 13
INPUT SIGNAL PATH ................................................................................................. 14
ANALOGUE TO DIGITAL CONVERTER (ADC).......................................................... 19
INPUT LIMITER / AUTOMATIC LEVEL CONTROL (ALC) .......................................... 22
OUTPUT SIGNAL PATH ............................................................................................. 26
ANALOGUE OUTPUTS............................................................................................... 33
OUTPUT SWITCH ...................................................................................................... 38
DIGITAL AUDIO INTERFACES................................................................................... 40
AUDIO SAMPLE RATES ............................................................................................. 46
MASTER CLOCK AND PHASE LOCKED LOOP (PLL) ............................................... 47
GENERAL PURPOSE INPUT/OUTPUT...................................................................... 49
CONTROL INTERFACE.............................................................................................. 49
RESETTING THE CHIP........................................................................................50
POWER SUPPLIES .................................................................................................... 50
POWER MANAGEMENT ............................................................................................ 51
REGISTER MAP...................................................................................................52
DIGITAL FILTER CHARACTERISTICS ...............................................................53
TERMINOLOGY .......................................................................................................... 53
DAC FILTER RESPONSES .................................................................................54
ADC FILTER RESPONSES .................................................................................54
DE-EMPHASIS FILTER RESPONSES ................................................................55
HIGHPASS FILTER..............................................................................................56
5-BAND EQUALISER...........................................................................................57
APPLICATIONS INFORMATION .........................................................................61
RECOMMENDED EXTERNAL COMPONENTS .......................................................... 61
PACKAGE DIAGRAM ..........................................................................................62
IMPORTANT NOTICE ..........................................................................................63
ADDRESS ................................................................................................................... 63
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PP Rev 1.1 September 2004
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