WM8978 Datasheet, PDF (2/78 Pages) Wolfson Microelectronics plc – STEREO CODEC WITH SPEAKER DRIVER

WM8978
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TABLE OF CONTENTS
DESCRIPTION .......................................................................................................1
FEATURES.............................................................................................................1
APPLICATIONS .....................................................................................................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 ............................................................................................................ 9
POWER CONSUMPTION ....................................................................................10
SIGNAL TIMING REQUIREMENTS .....................................................................11
SYSTEM CLOCK TIMING ........................................................................................... 11
AUDIO INTERFACE TIMING – MASTER MODE ........................................................ 11
AUDIO INTERFACE TIMING – SLAVE MODE............................................................ 12
CONTROL INTERFACE TIMING – 3-WIRE MODE .................................................... 13
CONTROL INTERFACE TIMING – 2-WIRE MODE .................................................... 14
DEVICE DESCRIPTION.......................................................................................15
INTRODUCTION ......................................................................................................... 15
INPUT SIGNAL PATH ................................................................................................. 17
ANALOGUE TO DIGITAL CONVERTER (ADC).......................................................... 23
INPUT LIMITER / AUTOMATIC LEVEL CONTROL (ALC) .......................................... 27
OUTPUT SIGNAL PATH ............................................................................................. 31
3D STEREO ENHANCEMENT .................................................................................... 37
ANALOGUE OUTPUTS............................................................................................... 38
DIGITAL AUDIO INTERFACES................................................................................... 52
AUDIO SAMPLE RATES ............................................................................................. 59
MASTER CLOCK AND PHASE LOCKED LOOP (PLL) ............................................... 59
GENERAL PURPOSE INPUT/OUTPUT...................................................................... 61
OUTPUT SWITCHING (JACK DETECT)..................................................................... 62
CONTROL INTERFACE.............................................................................................. 63
RESETTING THE CHIP .............................................................................................. 64
POWER SUPPLIES .................................................................................................... 64
POWER MANAGEMENT ............................................................................................ 65
REGISTER MAP...................................................................................................67
DIGITAL FILTER CHARACTERISTICS ...............................................................69
TERMINOLOGY .......................................................................................................... 69
DAC FILTER RESPONSES......................................................................................... 70
ADC FILTER RESPONSES......................................................................................... 70
HIGHPASS FILTER..................................................................................................... 71
5-BAND EQUALISER .................................................................................................. 72
APPLICATIONS INFORMATION .........................................................................76
RECOMMENDED EXTERNAL COMPONENTS .......................................................... 76
PACKAGE DIAGRAM ..........................................................................................77
IMPORTANT NOTICE ..........................................................................................78
ADDRESS: .................................................................................................................. 78
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PP Rev 1.7 January 2005
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