wm8987 Wolfson Microelectronics plc, wm8987 Datasheet - Page 2

• Manufacturer Part Number: wm8987
• Description: Stereo Codec For Portable Audio Applications
• Manufacturer: Wolfson Microelectronics plc

WM8987L
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DESCRIPTION .......................................................................................................1
FEATURES.............................................................................................................1
APPLICATIONS .....................................................................................................1
BLOCK DIAGRAM .................................................................................................1
TABLE OF CONTENTS .........................................................................................2
PIN CONFIGURATION...........................................................................................4
ORDERING INFORMATION ..................................................................................4
PIN DESCRIPTION ................................................................................................5
ABSOLUTE MAXIMUM RATINGS.........................................................................6
RECOMMENDED OPERATION CONDITIONS .....................................................6
ELECTRICAL CHARACTERISTICS ......................................................................7
TYPICAL PERFORMANCE....................................................................................9
SIGNAL TIMING REQUIREMENTS .....................................................................12
INTERNAL POWER ON RESET CIRCUIT ..........................................................16
DEVICE DESCRIPTION.......................................................................................17
REGISTER MAP...................................................................................................47
DIGITAL FILTER CHARACTERISTICS ...............................................................48
APPLICATIONS INFORMATION .........................................................................53
POWER CONSUMPTION.............................................................................................. 9
HEADPHONE OUTPUT THD VERSUS POWER (TYPICAL)....................................... 10
OUTPUT PGA’S LINEARITY ....................................................................................... 11
SYSTEM CLOCK TIMING............................................................................................ 12
AUDIO INTERFACE TIMING – MASTER MODE ......................................................... 12
AUDIO INTERFACE TIMING – SLAVE MODE ............................................................ 13
CONTROL INTERFACE TIMING – 3-WIRE MODE ..................................................... 14
CONTROL INTERFACE TIMING – 2-WIRE MODE ..................................................... 15
INTRODUCTION.......................................................................................................... 17
INPUT SIGNAL PATH.................................................................................................. 17
AUTOMATIC LEVEL CONTROL (ALC) ....................................................................... 24
OUTPUT SIGNAL PATH.............................................................................................. 28
ANALOGUE OUTPUTS ............................................................................................... 33
DIGITAL AUDIO INTERFACE...................................................................................... 36
AUDIO INTERFACE CONTROL .................................................................................. 39
CLOCKING AND SAMPLE RATES .............................................................................. 41
CONTROL INTERFACE .............................................................................................. 43
POWER SUPPLIES ..................................................................................................... 44
POWER MANAGEMENT ............................................................................................. 45
TERMINOLOGY........................................................................................................... 48
DAC FILTER RESPONSES ......................................................................................... 49
ADC FILTER RESPONSES ......................................................................................... 50
DE-EMPHASIS FILTER RESPONSES ........................................................................ 51
HIGHPASS FILTER ..................................................................................................... 52
RECOMMENDED EXTERNAL COMPONENTS........................................................... 53
DRIVING BTL HEADSETS........................................................................................... 54
DRIVING SINGLE-ENDED HEADPHONES ................................................................. 54
MICROPHONE INPUT CONFIGURATION .................................................................. 56
LINE INPUT CONFIGURATION................................................................................... 57
MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS ........................................ 57
POWER MANAGEMENT EXAMPLES ......................................................................... 57
TABLE OF CONTENTS
PD Rev 4.0 August 2008
Production Data
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