WM8978_06 Wolfson Microelectronics Ltd., WM8978_06 Datasheet - Page 2

• Manufacturer Part Number: WM8978_06
• Description: Stereo Codec With Speaker Driver
• Manufacturer: Wolfson Microelectronics Ltd.

WM8978
DESCRIPTION .......................................................................................................1
BLOCK DIAGRAM .................................................................................................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
SPEAKER OUTPUT THD VERSUS POWER ......................................................11
POWER CONSUMPTION ....................................................................................12
AUDIO PATHS OVERVIEW .................................................................................14
SIGNAL TIMING REQUIREMENTS .....................................................................15
INTERNAL POWER ON RESET CIRCUIT ..........................................................19
DEVICE DESCRIPTION.......................................................................................25
REGISTER MAP...................................................................................................91
DIGITAL FILTER CHARACTERISTICS .............................................................110
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TERMINOLOGY .......................................................................................................... 10
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
RECOMMENDED POWER UP/DOWN SEQUENCE .................................................. 21
INTRODUCTION ......................................................................................................... 25
INPUT SIGNAL PATH ................................................................................................. 27
ANALOGUE TO DIGITAL CONVERTER (ADC).......................................................... 34
INPUT LIMITER / AUTOMATIC LEVEL CONTROL (ALC) .......................................... 40
OUTPUT SIGNAL PATH ............................................................................................. 52
3D STEREO ENHANCEMENT .................................................................................... 59
ANALOGUE OUTPUTS............................................................................................... 59
DIGITAL AUDIO INTERFACES................................................................................... 75
AUDIO SAMPLE RATES ............................................................................................. 80
MASTER CLOCK AND PHASE LOCKED LOOP (PLL) ............................................... 80
COMPANDING............................................................................................................ 83
GENERAL PURPOSE INPUT/OUTPUT...................................................................... 85
OUTPUT SWITCHING (JACK DETECT)..................................................................... 86
CONTROL INTERFACE.............................................................................................. 88
RESETTING THE CHIP .............................................................................................. 89
POWER SUPPLIES .................................................................................................... 89
POWER MANAGEMENT ............................................................................................ 90
REGISTER BITS BY ADDRESS ................................................................................. 93
TERMINOLOGY ........................................................................................................ 110
DAC FILTER RESPONSES....................................................................................... 111
ADC FILTER RESPONSES....................................................................................... 111
HIGHPASS FILTER................................................................................................... 112
5-BAND EQUALISER ................................................................................................ 113
TABLE OF CONTENTS
PP Rev 3.0 May 2006
Pre-Production
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