WM8776

w DESCRIPTION The WM8776 is a high performance, stereo audio CODEC with five channel input selector. The WM8776 is ideal for surround sound processing applications for home hi-fi, DVD-RW and other audio visual equipment. A stereo 24-bit multi-bit sigma delta ADC is used with a five stereo channel input mixer. Each ADC channel has programmable gain control with automatic level control. Digital audio output word lengths from 16-32 bits and sampling rates from 32kHz to 96kHz are supported. A stereo 24-bit multi-bit sigma delta DAC is used with digital audio input word lengths from 16-32 bits and sampling rates from 32kHz to 192kHz. The DAC has an input mixer allowing an external analogue signal to be mixed with the DAC signal. There are also Headphone and line outputs, with volume controls for the headphones. The WM8776 supports fully independent sample rates for the ADC and DAC. The audio data interface supports I2S, left justified, right justified and DSP formats. The device is controlled in software via a 2 or 3 wire serial interface, selected by the MODE pin, which 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. WM8776 24-bit, 192kHz Stereo CODEC with 5 Channel I/P Multiplexer FEATURES • Audio Performance − 108dB SNR (‘A’ weighted @ 48kHz) DAC − 102dB SNR (‘A’ weighted @ 48kHz) ADC DAC Sampling Frequency: 32kHz – 192kHz ADC Sampling Frequency: 32kHz – 96kHz Five stereo ADC inputs with analogue gain adjust from +24dB to –21dB in 0.5dB steps Programmable Limiter or Automatic Level Control (ALC) Stereo DAC with independent analogue and digital volume controls Stereo Headphone and Line Output 3-Wire SPI Compatible or 2-Wire Software 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 Analogue Bypass Path Feature Selectable AUX input to the volume controls 2.7V to 5.5V Analogue, 2.7V to 3.6V Digital supply Operation • • • • • • • • • • • • APPLICATIONS • • Surround Sound AV Processors and Hi-Fi systems DVD-RW BLOCK DIAGRAM WOLFSON MICROELECTRONICS plc w :: www.wolfsonmicro.com Production Data, April 2005, Rev 4.0 Copyright 2005 Wolfson Microelectronics plc WM8776 TABLE OF CONTENTS Production Data 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 ADDRESS: .................................................................................................................. 57 w PD Rev 4.0 April 2005 2 Production Data WM8776 PIN CONFIGURATION ORDERING INFORMATION DEVICE W M8776SEFT/V W M8776SEFT/RV Note: Reel quantity = 2,200 TEMPERATURE RANGE -25 to +85oC -25 to +85oC PACKAGE 48-pin TQFP (Pb-free) 48-pin TQFP (Pb-free, tape and reel) MOISTURE SENSITIVITY LEVEL MSL1 (drybagged) MSL1 (drybagged) PEAK SOLDERING TEMPERATURE 260°C 260°C w PD Rev 4.0 April 2005 3 WM8776 PIN DESCRIPTION PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 NAME AIN2L AIN1R AIN1L DACBCLK DACMCLK DIN DACLRC ZFLAGR ZFLAGL ADCBCLK ADCMCLK DOUT ADCLRC DGND DVDD MODE CE DI CL HPOUTL HPGND HPVDD HPOUTR NC NC VOUTL VOUTR VMIDDAC DACREFN DACREFP AUXR AUXL VMIDADC ADCREFGND ADCREFP AVDD AGND AINVGR AINOPR AINVGL AINOPL AIN5R AIN5L AIN4R AIN4L AIN3R AIN3L AIN2R TYPE Analogue Input Analogue Input Analogue Input Digital input/output Digital input Digital Input Digital input/output Open Drain output Open Drain output Digital input/output Digital input Digital output Digital input/output Supply Supply Digital input Digital input Digital input Digital input Analogue Output Supply Supply Analogue Output Not bonded Not bonded Analogue output Analogue output Analogue output Analogue input Analogue input Analogue input Analogue input Analogue Output Supply Analogue Output Supply Supply Analogue Input Analogue Output Analogue Input Analogue Output Analogue Input Analogue Input Analogue Input Analogue Input Analogue Input Analogue Input Analogue Input DAC channel left output DAC channel right output DAC midrail decoupling pin ; 10uF external decoupling DAC negative reference input DAC positive reference input DAC mixer right channel input DAC mixer left channel input DESCRIPTION Channel 2 left input multiplexor virtual ground Channel 1 right input multiplexor virtual ground Channel 1 left input multiplexor virtual ground DAC audio interface bit clock Production Data Master DAC clock; 256, 384, 512 or 768fs (fs = word clock frequency) DAC data input DAC left/right word clock DAC Right Zero Flag output (external pull-up resistor required) DAC Left Zero Flag output (external pull-up resistor required) ADC audio interface bit clock ADC audio interface master clock ADC data output ADC left/right word clock Digital negative supply Digital positive supply Control interface mode select Serial interface Latch signal Serial interface data Serial interface clock Headphone left channel output Headphone negative supply Headphone positive supply Headphone right channel output ADC midrail divider decoupling pin; 10uF external decoupling ADC negative supply and substrate connection ADC positive reference decoupling pin; 10uF external decoupling Analogue positive supply Analogue negative supply and subVstrate connection Right channel multiplexor virtual ground Right channel multiplexor output Left channel multiplexor virtual ground Left channel multiplexor output Channel 5 right input multiplexor virtual ground Channel 5 left input multiplexor virtual ground Channel 4 right input multiplexor virtual ground Channel 4 left input multiplexor virtual ground Channel 3 right input multiplexor virtual ground Channel 3 left input multiplexor virtual ground Channel 2 right input multiplexor virtual ground Note : Digital input pins have Schmitt trigger input buffers. w PD Rev 4.0 April 2005 4 Production Data WM8776 ABSOLUTE MAXIMUM RATINGS Absolute Maximum Ratings are stress ratings only. Permanent damage to the device may be caused by continuously operating at or beyond these limits. Device functional operating limits and guaranteed performance specifications are given under Electrical Characteristics at the test conditions specified. ESD Sensitive Device. This device is manufactured on a CMOS process. It is therefore generically susceptible to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage of this device. Wolfson tests its package types according to IPC/JEDEC J-STD-020B for Moisture Sensitivity to determine acceptable storage conditions prior to surface mount assembly. These levels are: MSL1 = unlimited floor life at