WM8946
TABLE OF CONTENTS
Production Data
DESCRIPTION ....................................................................................................... 1
FEATURES ............................................................................................................ 1
APPLICATIONS..................................................................................................... 1
TABLE OF CONTENTS ......................................................................................... 2
BLOCK DIAGRAM ................................................................................................ 5
PIN CONFIGURATION .......................................................................................... 6
ORDERING INFORMATION .................................................................................. 6
PIN DESCRIPTION ................................................................................................ 7
ABSOLUTE MAXIMUM RATINGS ........................................................................ 8
RECOMMENDED OPERATING CONDITIONS ..................................................... 8
THERMAL PERFORMANCE ................................................................................. 9
ELECTRICAL CHARACTERISTICS ................................................................... 10
TERMINOLOGY ............................................................................................................. 13
TYPICAL PERFORMANCE ................................................................................. 14
POWER CONSUMPTION .............................................................................................. 15
AUDIO SIGNAL PATHS DIAGRAM .................................................................... 16
SIGNAL TIMING REQUIREMENTS .................................................................... 17
SYSTEM CLOCK TIMING .............................................................................................. 17
AUDIO INTERFACE TIMING ......................................................................................... 17
MASTER MODE ........................................................................................................................................ 17
SLAVE MODE ........................................................................................................................................... 18
CONTROL INTERFACE TIMING ................................................................................... 19
DEVICE DESCRIPTION ...................................................................................... 22
INTRODUCTION ............................................................................................................ 22
ANALOGUE INPUT SIGNAL PATH ............................................................................... 23
INPUT PGA ENABLE ................................................................................................................................ 24
INPUT PGA CONFIGURATION ................................................................................................................ 24
MICROPHONE BIAS CONTROL .............................................................................................................. 25
INPUT PGA GAIN CONTROL ................................................................................................................... 25
DIGITAL MICROPHONE INTERFACE .......................................................................... 28
ANALOGUE-TO-DIGITAL CONVERTER (ADC) ............................................................ 29
ADC VOLUME CONTROL......................................................................................................................... 30
ADC HIGH PASS FILTER ......................................................................................................................... 32
DSP CORE ..................................................................................................................... 33
DSP CONFIGURATION MODES .............................................................................................................. 33
LOW-PASS / HIGH-PASS FILTER (LPF/HPF) .......................................................................................... 34
3D SURROUND ........................................................................................................................................ 35
5-NOTCH FILTER ..................................................................................................................................... 35
DF1 FILTER............................................................................................................................................... 37
RETUNE
TM
FILTER ................................................................................................................................... 37
5-BAND EQ ............................................................................................................................................... 38
DYNAMIC RANGE CONTROL (DRC) ....................................................................................................... 38
SIGNAL ENHANCEMENT REGISTER CONTROLS ................................................................................. 38
DYNAMIC RANGE CONTROL (DRC) ........................................................................... 40
DRC COMPRESSION / EXPANSION / LIMITING ..................................................................................... 40
GAIN LIMITS ............................................................................................................................................. 43
GAIN READBACK ..................................................................................................................................... 44
DYNAMIC CHARACTERISTICS ............................................................................................................... 44
ANTI-CLIP CONTROL ............................................................................................................................... 46
QUICK-RELEASE CONTROL ................................................................................................................... 46
DRC INITIAL VALUE ................................................................................................................................. 47
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PD, July 2012, Rev 4.3
2
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
