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WM8775 Dataheets PDF



Part Number WM8775
Manufacturers Wolfson Microelectronics plc
Logo Wolfson Microelectronics plc
Description 24 BIT 96 KHZ ADC WITH 4 CHANNEL I/P MULTIPLEXER
Datasheet WM8775 DatasheetWM8775 Datasheet (PDF)

w WM8775 24-bit, 96kHz ADC with 4 Channel I/P Multiplexer DESCRIPTION The WM8775 is a high performance, stereo audio ADC with a 4 channel input mixer. The WM8775 is ideal for digitising multiple analogue sources for surround sound processing applications for home hi-fi, automotive and other audio visual equipment. A stereo 24-bit multi-bit sigma delta ADC is used with a four stereo channel input selector. Each channel has programmable gain control. Digital audio output word lengths from 16-32.

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w WM8775 24-bit, 96kHz ADC with 4 Channel I/P Multiplexer DESCRIPTION The WM8775 is a high performance, stereo audio ADC with a 4 channel input mixer. The WM8775 is ideal for digitising multiple analogue sources for surround sound processing applications for home hi-fi, automotive and other audio visual equipment. A stereo 24-bit multi-bit sigma delta ADC is used with a four stereo channel input selector. Each channel has programmable gain control. Digital audio output word lengths from 16-32 bits and sampling rates from 32kHz to 96kHz are supported. The audio data interface supports I2S, left justified, right justified and DSP digital audio formats. The device is controlled via a 2 or 3 wire serial interface. The interface provides access to all features including channel selection, volume controls, mutes, de-emphasis and power management facilities. The device is available in a 28-lead SSOP package. The WM8775 is software compatible with the WM8776. BLOCK DIAGRAM FEATURES • Audio Performance − 102dB SNR (‘A’ weighted @ 48kHz) − -90dB THD • ADC Sampling Frequency: 32kHz – 96kHz • Four stereo ADC inputs with analogue gain adjust from +24dB to –21dB in 0.5dB steps • Digital gain adjust from -21.5dB to -103dB. • Programmable Automatic Level Control (ALC) or Limiter on ADC input • 3-Wire SPI Compatible or 2-wire Serial Control Interface • Master or Slave Clocking Mode • Programmable Audio Data Interface Modes − I2S, Left, Right Justified or DSP − 16/20/24/32 bit Word Lengths • 2.7V to 5.5V Analogue, 2.7V to 3.6V Digital supply Operation APPLICATIONS • Surround Sound AV Processors and Hi-Fi systems • Automotive Audio AGN D VM IDAD C AVD D AD CR EF P ADC R EF GND AINOPL AINOPR AINVGL AINVGR AIN1L AIN1R AIN2L AIN2R AIN3L AIN3R AIN4L AIN4R IN PU T MIXE R VMID W WM8775 STEREO ADC AUDIO INTERFACE ALC AND DIGITAL FILTERS MCLK DOUT ADCLRC BCLK CONTROL INTERFACE D GN D D VD D M ODE CL CE DI WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews/ Production Data, October 2008, Rev 4.4 Copyright ©2008 Wolfson Microelectronics plc WM8775 Production Data TABLE OF CONTENTS DESCRIPTION ................................................................................................................1 FEATURES......................................................................................................................1 BLOCK DIAGRAM ..........................................................................................................1 PIN CONFIGURATION....................................................................................................3 ORDERING INFORMATION ...........................................................................................3 PIN DESCRIPTION .........................................................................................................4 ABSOLUTE MAXIMUM RATINGS..................................................................................5 RECOMMENDED OPERATING CONDITIONS ..............................................................5 ELECTRICAL CHARACTERISTICS ...............................................................................6 TERMINOLOGY ......................................................................................................................7 MASTER CLOCK TIMING...............................................................................................7 DIGITAL AUDIO INTERFACE – MASTER MODE ...................................................................8 DIGITAL AUDIO INTERFACE – SLAVE MODE ......................................................................9 3-WIRE MPU INTERFACE TIMING ......................................................................................10 2-WIRE MPU INTERFACE TIMING ......................................................................................10 INTERNAL POWER ON RESET CIRCUIT ...................................................................12 DEVICE DESCRIPTION................................................................................................14 INTRODUCTION ...................................................................................................................14 AUDIO DATA SAMPLING RATES.........................................................................................14 POWERDOWN MODES .......................................................................................................15 DIGITAL AUDIO INTERFACE ...............................................................................................16 CONTROL INTERFACE OPERATION ..................................................................................20 CONTROL INTERFACE REGISTERS ..................................................................................21 LIMITER / AUTOMATIC LEVEL CONTROL (ALC) ................................................................26 REGISTER MAP ....................................


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