WM8775 w 24-bit, 96kHz ADC with 4 Channel I/P Multiplexer DESCRIPTION FEATURES Audio Performance The WM8775 is a high performance, stereo audio ADC with a 4 channel input mixer. The WM8775 is ideal for 102dB SNR (A weighted 48kHz) digitising multiple analogue sources for surround sound -90dB THD processing applications for home hi-fi, automotive and ADC Sampling Frequency: 32kHz 96kHz other audio visual equipment. Four stereo ADC inputs with analogue gain adjust from A stereo 24-bit multi-bit sigma delta ADC is used with a +24dB to 21dB in 0.5dB steps four stereo channel input selector. Each channel has Digital gain adjust from -21.5dB to -103dB. programmable gain control. Digital audio output word Programmable Automatic Level Control (ALC) or Limiter on lengths from 16-32 bits and sampling rates from 32kHz ADC input to 96kHz are supported. 3-Wire SPI Compatible or 2-wire Serial Control Interface 2 The audio data interface supports I S, left justified, right Master or Slave Clocking Mode justified and DSP digital audio formats. Programmable Audio Data Interface Modes 2 The device is controlled via a 2 or 3 wire serial interface. I S, Left, Right Justified or DSP The interface provides access to all features including 16/20/24/32 bit Word Lengths channel selection, volume controls, mutes, de-emphasis 2.7V to 5.5V Analogue, 2.7V to 3.6V Digital supply Operation and power management facilities. The device is available in a 28-lead SSOP package. The APPLICATIONS WM8775 is software compatible with the WM8776. Surround Sound AV Processors and Hi-Fi systems Automotive Audio BLOCK DIAGRAM W WM8775 AINOPL AINOPR AINVGL AINVGR AIN1L AIN1R AIN2L AUDIO INTERFACE MCLK AIN2R DOUT STEREO ALC AND AIN3L ADC ADCLRC AIN3R BCLK DIGITAL FILTERS AIN4L AIN4R VMID CONTROL INTERFACE WOLFSON MICROELECTRONICS plc Production Data, October 2008, Rev 4.4 To receive regular email updates, sign up at 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 ...................................................................................................................31 DIGITAL FILTER CHARACTERISTICS ........................................................................35 ADC FILTER RESPONSES...................................................................................................35 ADC HIGH PASS FILTER .....................................................................................................35 APPLICATIONS INFORMATION ..................................................................................36 EXTERNAL CIRCUIT CONFIGURATION .............................................................................36 RECOMMENDED EXTERNAL COMPONENTS....................................................................37 PACKAGE DIMENSIONS .............................................................................................38 IMPORTANT NOTICE ...................................................................................................39 ADDRESS: ............................................................................................................................39 PD, Rev 4.4, October 2008 w 2