WM8976
Pre-Production
TABLE OF CONTENTS
DESCRIPTION .......................................................................................................1
FEATURES.............................................................................................................1
APPLICATIONS .....................................................................................................1
TABLE OF CONTENTS .........................................................................................2
PIN CONFIGURATION...........................................................................................4
ORDERING INFORMATION ..................................................................................4
PIN DESCRIPTION ................................................................................................5
ABSOLUTE MAXIMUM RATINGS.........................................................................6
RECOMMENDED OPERATING CONDITIONS .....................................................6
ELECTRICAL CHARACTERISTICS ......................................................................7
TERMINOLOGY.......................................................................................................... 10
SPEAKER OUTPUT THD VERSUS POWER ......................................................11
POWER CONSUMPTION ....................................................................................12
AUDIO PATHS OVERVIEW.................................................................................14
SIGNAL TIMING REQUIREMENTS.....................................................................15
SYSTEM CLOCK TIMING ........................................................................................... 15
AUDIO INTERFACE TIMING – MASTER MODE ........................................................ 15
AUDIO INTERFACE TIMING – SLAVE MODE............................................................ 16
CONTROL INTERFACE TIMING – 3-WIRE MODE .................................................... 17
CONTROL INTERFACE TIMING – 2-WIRE MODE .................................................... 18
DEVICE DESCRIPTION.......................................................................................19
INTRODUCTION......................................................................................................... 19
INPUT SIGNAL PATH................................................................................................. 21
ANALOGUE TO DIGITAL CONVERTER (ADC).......................................................... 25
INPUT LIMITER / AUTOMATIC LEVEL CONTROL (ALC) .......................................... 29
OUTPUT SIGNAL PATH ............................................................................................. 41
3D STEREO ENHANCEMENT.................................................................................... 48
ANALOGUE OUTPUTS............................................................................................... 48
DIGITAL AUDIO INTERFACES................................................................................... 63
AUDIO SAMPLE RATES............................................................................................. 68
MASTER CLOCK AND PHASE LOCKED LOOP (PLL)............................................... 68
COMPANDING............................................................................................................ 70
GENERAL PURPOSE INPUT/OUTPUT...................................................................... 72
OUTPUT SWITCHING (JACK DETECT)..................................................................... 73
CONTROL INTERFACE.............................................................................................. 74
RESETTING THE CHIP .............................................................................................. 75
POWER SUPPLIES .................................................................................................... 76
RECOMMENDED POWER UP/DOWN SEQUENCE .................................................. 77
POWER MANAGEMENT ............................................................................................ 81
REGISTER MAP...................................................................................................82
REGISTER BITS BY ADDRESS..........................................................................84
DIGITAL FILTER CHARACTERISTICS...............................................................99
TERMINOLOGY.......................................................................................................... 99
DAC FILTER RESPONSES....................................................................................... 100
ADC FILTER RESPONSES....................................................................................... 100
HIGHPASS FILTER................................................................................................... 101
5-BAND EQUALISER................................................................................................ 102
APPLICATION INFORMATION..........................................................................106
RECOMMENDED EXTERNAL COMPONENTS........................................................ 106
PP Rev 3.0 April 2006
w
2
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
