WM8776 w 24-bit, 192kHz Stereo CODEC with 5 Channel I/P Multiplexer DESCRIPTION FEATURES Audio Performance The WM8776 is a high performance, stereo audio CODEC with five channel input selector. The WM8776 is 108dB SNR (A weighted 48kHz) DAC ideal for surround sound processing applications for 102dB SNR (A weighted 48kHz) ADC home hi-fi, DVD-RW and other audio visual equipment. DAC Sampling Frequency: 32kHz 192kHz A stereo 24-bit multi-bit sigma delta ADC is used with a ADC Sampling Frequency: 32kHz 96kHz five stereo channel input mixer. Each ADC channel has Five stereo ADC inputs with analogue gain adjust from programmable gain control with automatic level control. +24dB to 21dB in 0.5dB steps Digital audio output word lengths from 16-32 bits and Programmable Limiter or Automatic Level Control (ALC) sampling rates from 32kHz to 96kHz are supported. Stereo DAC with independent analogue and digital A stereo 24-bit multi-bit sigma delta DAC is used with volume controls digital audio input word lengths from 16-32 bits and Stereo Headphone and Line Output sampling rates from 32kHz to 192kHz. The DAC has an 3-Wire SPI Compatible or 2-Wire Software Serial input mixer allowing an external analogue signal to be Control Interface mixed with the DAC signal. There are also Headphone Master or Slave Clocking Mode and line outputs, with volume controls for the Programmable Audio Data Interface Modes headphones. 2 I S, Left, Right Justified or DSP The WM8776 supports fully independent sample rates 16/20/24/32 bit Word Lengths for the ADC and DAC. The audio data interface supports 2 Analogue Bypass Path Feature I S, left justified, right justified and DSP formats. Selectable AUX input to the volume controls The device is controlled in software via a 2 or 3 wire 2.7V to 5.5V Analogue, 2.7V to 3.6V Digital supply serial interface, selected by the MODE pin, which Operation provides access to all features including channel selection, volume controls, mutes, and de-emphasis facilities. The device is available in a 48-pin TQFP package. APPLICATIONS Surround Sound AV Processors and Hi-Fi systems BLOCK DIAGRAM DVD-RW WOLFSON MICROELECTRONICS plc Production Data, September 2008, Rev 4.1 To receive regular email updates, sign up at WM8776 Production Data 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 ELECTRICAL CHARACTERISTICS ......................................................................6 TERMINOLOGY............................................................................................................ 7 MASTER CLOCK TIMING......................................................................................9 DIGITAL AUDIO INTERFACE MASTER MODE....................................................... 10 DIGITAL AUDIO INTERFACE SLAVE MODE .......................................................... 11 3-WIRE MPU INTERFACE TIMING ............................................................................ 12 CONTROL INTERFACE TIMING 2-WIRE MODE .................................................... 13 INTERNAL POWER ON RESET CIRCUIT ..........................................................14 DEVICE DESCRIPTION.......................................................................................16 INTRODUCTION......................................................................................................... 16 AUDIO DATA SAMPLING RATES............................................................................... 17 ZERO DETECT ........................................................................................................... 18 POWERDOWN MODES ............................................................................................. 18 DIGITAL AUDIO INTERFACE ..................................................................................... 19 CONTROL INTERFACE OPERATION........................................................................ 23 CONTROL INTERFACE REGISTERS ........................................................................ 25 LIMITER / AUTOMATIC LEVEL CONTROL (ALC)...................................................... 34 REGISTER MAP ......................................................................................................... 41 DIGITAL FILTER CHARACTERISTICS ...............................................................49 DAC FILTER RESPONSES......................................................................................... 49 ADC FILTER RESPONSES......................................................................................... 50 ADC HIGH PASS FILTER ........................................................................................... 51 DIGITAL DE-EMPHASIS CHARACTERISTICS........................................................... 52 APPLICATIONS INFORMATION .........................................................................53 EXTERNAL CIRCUIT CONFIGURATION ................................................................... 53 RECOMMENDED EXTERNAL COMPONENTS ..................................................54 PACKAGE DIMENSIONS ....................................................................................56 PACKAGE DIMENSIONS ....................................................................................56 IMPORTANT NOTICE ..........................................................................................57 ADDRESS: .................................................................................................................. 57 PD, Rev 4.1, September 2008 w 2