wm8941 Wolfson Microelectronics plc, wm8941 Datasheet - Page 3

• Manufacturer Part Number: wm8941
• Description: Mono Codec With Speaker Driver And Video Buffer
• Manufacturer: Wolfson Microelectronics plc

Production Data
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DESCRIPTION................................................................................................................ 1
FEATURES ..................................................................................................................... 1
APPLICATIONS.............................................................................................................. 1
BLOCK DIAGRAM ......................................................................................................... 2
PIN CONFIGURATION ................................................................................................... 5
ORDERING INFORMATION........................................................................................... 5
PIN DESCRIPTION......................................................................................................... 6
ABSOLUTE MAXIMUM RATINGS ................................................................................. 7
RECOMMENDED OPERATING CONDITIONS.............................................................. 7
ELECTRICAL CHARACTERISTICS .............................................................................. 8
AUDIO PATHS OVERVIEW ......................................................................................... 11
SIGNAL TIMING REQUIREMENTS ............................................................................. 13
DEVICE DESCRIPTION ............................................................................................... 17
REGISTER MAP ........................................................................................................... 75
DIGITAL FILTER CHARACTERISTICS ....................................................................... 87
APPLICATIONS INFORMATION ................................................................................. 92
TERMINOLOGY ...................................................................................................................... 10
SYSTEM CLOCK TIMING ....................................................................................................... 13
AUDIO INTERFACE TIMING – MASTER MODE.................................................................... 13
AUDIO INTERFACE TIMING – SLAVE MODE ....................................................................... 14
CONTROL INTERFACE TIMING – 3-WIRE MODE ................................................................ 15
CONTROL INTERFACE TIMING – 2-WIRE MODE ................................................................ 16
INTRODUCTION ..................................................................................................................... 17
INPUT SIGNAL PATH ............................................................................................................. 18
ANALOGUE TO DIGITAL CONVERTER (ADC) ..................................................................... 24
INPUT LIMITER / AUTOMATIC LEVEL CONTROL (ALC)...................................................... 29
OUTPUT SIGNAL PATH ......................................................................................................... 42
VOLUME BOOST .................................................................................................................... 44
ANALOGUE OUTPUTS........................................................................................................... 46
OUTPUT SWITCH................................................................................................................... 49
VIDEO BUFFER ...................................................................................................................... 52
DIGITAL AUDIO INTERFACES............................................................................................... 57
AUDIO SAMPLE RATES......................................................................................................... 61
MASTER CLOCK AND PHASE LOCKED LOOP (PLL) .......................................................... 62
COMPANDING ........................................................................................................................ 65
GENERAL PURPOSE INPUT/OUTPUT.................................................................................. 67
CONTROL INTERFACE.......................................................................................................... 67
3-WIRE SERIAL CONTROL MODE ........................................................................................ 69
READBACK IN 3-WIRE MODE ............................................................................................... 69
2-WIRE SERIAL CONTROL MODE ........................................................................................ 70
RESETTING THE CHIP .......................................................................................................... 70
POWER SUPPLIES.................................................................................................................70
POWER MANAGEMENT ........................................................................................................ 73
POP MINIMISATION ...............................................................................................................74
REGISTER BITS BY ADDRESS ............................................................................................. 76
TERMINOLOGY ...................................................................................................................... 87
DAC FILTER RESPONSES .................................................................................................... 88
ADC FILTER RESPONSES .................................................................................................... 88
HIGHPASS FILTER................................................................................................................. 89
NOTCH FILTERS AND LOW PASS FILTER........................................................................... 90
TABLE OF CONTENTS
PD, Rev 4.0, August 2008
WM8941
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