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WM8987L Datasheet(PDF) 2 Page - Wolfson Microelectronics plc

Part No. WM8987L
Description  Stereo CODEC for Portable Audio Applications
Download  58 Pages
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Maker  WOLFSON [Wolfson Microelectronics plc]
Homepage  http://www.wolfsonmicro.com
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WM8987L Datasheet(HTML) 2 Page - Wolfson Microelectronics plc

 
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WM8987L
Pre-Production
w
PP Rev 3.0 January 2007
2
TABLE OF CONTENTS
DESCRIPTION .......................................................................................................1
FEATURES.............................................................................................................1
APPLICATIONS .....................................................................................................1
BLOCK DIAGRAM .................................................................................................1
TABLE OF CONTENTS .........................................................................................2
PIN CONFIGURATION...........................................................................................3
ORDERING INFORMATION ..................................................................................3
PIN DESCRIPTION ................................................................................................4
ABSOLUTE MAXIMUM RATINGS .........................................................................5
RECOMMENDED OPERATION CONDITIONS .....................................................5
ELECTRICAL CHARACTERISTICS ......................................................................6
TYPICAL PERFORMANCE....................................................................................8
POWER CONSUMPTION.............................................................................................. 8
HEADPHONE OUTPUT THD VERSUS POWER (TYPICAL)......................................... 9
OUTPUT PGA’S LINEARITY ....................................................................................... 10
SIGNAL TIMING REQUIREMENTS .....................................................................11
SYSTEM CLOCK TIMING............................................................................................ 11
AUDIO INTERFACE TIMING – MASTER MODE ......................................................... 11
AUDIO INTERFACE TIMING – SLAVE MODE ............................................................ 12
INTERNAL POWER ON RESET CIRCUIT ..........................................................15
DEVICE DESCRIPTION .......................................................................................16
INTRODUCTION.......................................................................................................... 16
INPUT SIGNAL PATH.................................................................................................. 16
AUTOMATIC LEVEL CONTROL (ALC) ....................................................................... 23
OUTPUT SIGNAL PATH.............................................................................................. 27
ANALOGUE OUTPUTS ............................................................................................... 32
DIGITAL AUDIO INTERFACE...................................................................................... 35
AUDIO INTERFACE CONTROL .................................................................................. 38
CLOCKING AND SAMPLE RATES .............................................................................. 40
CONTROL INTERFACE .............................................................................................. 42
POWER SUPPLIES ..................................................................................................... 43
POWER MANAGEMENT ............................................................................................. 44
REGISTER MAP...................................................................................................46
DIGITAL FILTER CHARACTERISTICS ...............................................................47
TERMINOLOGY........................................................................................................... 47
DAC FILTER RESPONSES ......................................................................................... 48
ADC FILTER RESPONSES ......................................................................................... 49
DE-EMPHASIS FILTER RESPONSES ........................................................................ 50
HIGHPASS FILTER ..................................................................................................... 51
APPLICATIONS INFORMATION .........................................................................52
RECOMMENDED EXTERNAL COMPONENTS........................................................... 52
DRIVING BTL HEADSETS........................................................................................... 53
DRIVING SINGLE-ENDED HEADPHONES ................................................................. 53
MICROPHONE INPUT CONFIGURATION .................................................................. 55
LINE INPUT CONFIGURATION................................................................................... 56
MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS ........................................ 56
POWER MANAGEMENT EXAMPLES ......................................................................... 56
IMPORTANT NOTICE ..........................................................................................58
ADDRESS.................................................................................................................... 58


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