WM8750BL Datasheet, PDF (2/59 Pages) Wolfson Microelectronics plc – Stereo CODEC for Portable Audio Applications

WM8750BL
Pre-Production
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
OUTPUT DRIVERS ......................................................................................................................... 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
ENABLING THE OUTPUTS ..........................................................................................................34
HEADPHONE SWITCH.................................................................................................................34
THERMAL SHUTDOWN ............................................................................................................... 35
HEADPHONE OUTPUT ................................................................................................................36
DIGITAL AUDIO INTERFACE .......................................................................................................37
AUDIO INTERFACE CONTROL ...................................................................................................41
CLOCKING AND SAMPLE RATES...............................................................................................43
CONTROL INTERFACE................................................................................................................45
POWER SUPPLIES.......................................................................................................................46
POWER MANAGEMENT ..............................................................................................................46
REGISTER MAP............................................................................................................. 49
DIGITAL FILTER CHARACTERISTICS.......................................................................... 50
TERMINOLOGY ............................................................................................................................50
DAC FILTER RESPONSES ..........................................................................................................51
ADC FILTER RESPONSES ..........................................................................................................52
DE-EMPHASIS FILTER RESPONSES .........................................................................................53
HIGHPASS FILTER.......................................................................................................................54
APPLICATIONS INFORMATION ................................................................................... 55
RECOMMENDED EXTERNAL COMPONENTS...........................................................................55
LINE INPUT CONFIGURATION....................................................................................................56
MICROPHONE INPUT CONFIGURATION...................................................................................56
MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS ........................................................56
POWER MANAGEMENT EXAMPLES..........................................................................................57
IMPORTANT NOTICE .................................................................................................... 59
ADDRESS...................................................................................................................................... 59
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Pre-Production Rev 3.3 January 2007
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