WM8971L Wolfson Microelectronics Ltd., WM8971L Datasheet - Page 2

• Manufacturer Part Number: WM8971L
• Description: Stereo Codec for Portable Audio Applications
• Manufacturer: Wolfson Microelectronics Ltd.

WM8971L
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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
POWER CONSUMPTION ....................................................................................12
SIGNAL TIMING REQUIREMENTS .....................................................................13
INTERNAL POWER ON RESET CIRCUIT ..........................................................17
DEVICE DESCRIPTION.......................................................................................18
REGISTER MAP...................................................................................................50
DIGITAL FILTER CHARACTERISTICS ...............................................................51
APPLICATIONS INFORMATION .........................................................................56
OUTPUT PGA’S LINEARITY ......................................................................................... 9
HEADPHONE OUTPUT THD VERSUS POWER......................................................... 10
SPEAKER THD AND NOISE VERSUS POWER ......................................................... 11
SYSTEM CLOCK TIMING............................................................................................ 13
AUDIO INTERFACE TIMING – MASTER MODE ......................................................... 13
AUDIO INTERFACE TIMING – SLAVE MODE ............................................................ 14
INTRODUCTION.......................................................................................................... 18
INPUT SIGNAL PATH.................................................................................................. 18
AUTOMATIC LEVEL CONTROL (ALC) ....................................................................... 25
OUTPUT SIGNAL PATH.............................................................................................. 28
ANALOGUE OUTPUTS ............................................................................................... 33
ENABLING THE OUTPUTS ......................................................................................... 35
HEADPHONE SWITCH ............................................................................................... 35
THERMAL SHUTDOWN .............................................................................................. 37
HEADPHONE OUTPUT ............................................................................................... 37
DIGITAL AUDIO INTERFACE...................................................................................... 38
AUDIO INTERFACE CONTROL .................................................................................. 42
CLOCKING AND SAMPLE RATES .............................................................................. 44
CONTROL INTERFACE .............................................................................................. 46
POWER SUPPLIES ..................................................................................................... 47
POWER MANAGEMENT ............................................................................................. 47
TERMINOLOGY........................................................................................................... 51
DAC FILTER RESPONSES ......................................................................................... 52
ADC FILTER RESPONSES ......................................................................................... 53
DE-EMPHASIS FILTER RESPONSES ........................................................................ 54
HIGHPASS FILTER ..................................................................................................... 55
RECOMMENDED EXTERNAL COMPONENTS........................................................... 56
LINE INPUT CONFIGURATION................................................................................... 57
MICROPHONE INPUT CONFIGURATION .................................................................. 57
MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS ........................................ 57
POWER MANAGEMENT EXAMPLES ......................................................................... 58
TABLE OF CONTENTS
PD Rev 4.1 August 2005
Production Data
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