WM8778SEDS/V

WM8778 w 24-bit, 192kHz Stereo CODEC DESCRIPTION FEATURES The WM8778 is a high performance, stereo audio CODEC. It is ideal for surround sound processing applications for home hi-fi, DVD-RW and other audio visual equipment. • Audio Performance • − 108dB SNR (‘A’ weighted @ 48kHz) DAC − 102dB SNR (‘A’ weighted @ 48kHz) ADC DAC Sampling Frequency: 32kHz – 192kHz The stereo 24-bit multi-bit sigma delta ADC has programmable gain with automatic level control. Digital audio output word lengths from 16-32 bits and sampling rates from 32kHz to 96kHz are supported. A stereo multi-bit sigma delta DAC is used with digital audio input word lengths from 16-32 bits and sampling rates from 32kHz to 192kHz. A multiplexor after the DAC allows the selection of either an external analogue input or DAC playback into the line outputs. The WM8778 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 which provides access to all features including volume controls, mutes, and de-emphasis facilities. It can also be controlled in hardware which gives access to the most commonly used features. Control interface selection is done via the MODE pin (trilevel). The device is available in a 28-lead SSOP package. BLOCK DIAGRAM • • • • ADC Sampling Frequency: 32kHz – 96kHz Stereo ADC input analogue gain adjust from +24dB to –21dB in 0.5dB steps ADC digital gain from -21.5dB to -103dB in 0.5dB steps Programmable Automatic Level Control (ALC) or Limiter on ADC input. • • • Stereo DAC with analogue line outputs. 3-Wire SPI Compatible or 2-wire Serial Control Interface Hardware Control Mode • • 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 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 WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews/ Production Data, July 2008, Rev 4.2 Copyright © 2008 Wolfson Microelectronics plc WM8778 Production Data TABLE OF CONTENTS DESCRIPTION .......................................................................................................1 FEATURES.............................................................................................................1 APPLICATIONS .....................................................................................................1 BLOCK DIAGRAM .................................................................................................1 TABLE OF CONTENTS .........................................................................................2 PIN CONFIGURATION...........................................................................................3 ORDERING INFORMATION ..................................................................................3 ABSOLUTE MAXIMUM RATINGS.........................................................................5 ELECTRICAL CHARACTERISTICS ......................................................................6 TERMINOLOGY ............................................................................................................ 7 MASTER CLOCK TIMING......................................................................................8 DIGITAL AUDIO INTERFACE – MASTER MODE ......................................................... 8 DIGITAL AUDIO INTERFACE – SLAVE MODE ............................................................ 9 3-WIRE MPU INTERFACE TIMING ............................................................................ 11 CONTROL INTERFACE TIMING – 2-WIRE MODE .................................................... 12 INTERNAL POWER ON RESET CIRCUIT ..........................................................13 DEVICE DESCRIPTION.......................................................................................15 INTRODUCTION ......................................................................................................... 15 AUDIO DATA SAMPLING RATES............................................................................... 15 ZERO DETECT ........................................................................................................... 17 POWERDOWN MODES ............................................................................................. 17 DIGITAL AUDIO INTERFACE ..................................................................................... 17 CONTROL INTERFACE OPERATION ........................................................................ 22 CONTROL INTERFACE REGISTERS ........................................................................ 24 LIMITER / AUTOMATIC LEVEL CONTROL (ALC) ...................................................... 32 REGISTER MAP ......................................................................................................... 38 DIGITAL FILTER CHARACTERISTICS ...............................................................45 DAC FILTER RESPONSES......................................................................................... 45 ADC FILTER RESPONSES......................................................................................... 46 ADC HIGH PASS FILTER ........................................................................................... 46 DIGITAL DE-EMPHASIS CHARACTERISTICS........................................................... 47 APPLICATIONS INFORMATION .........................................................................48 RECOMMENDED EXTERNAL COMPONENTS .......................................................... 48 PACKAGE DIMENSIONS ....................................................................................50 IMPORTANT NOTICE ..........................................................................................51 ADDRESS: .................................................................................................................. 51 w PD, Rev 4.2, July 2008 2 WM8778 Production Data PIN CONFIGURATION ORDERING INFORMATION MOISTURE SENSITIVITY LEVEL DEVICE TEMP. RANGE PACKAGE WM8778SEDS/V -25 to +85oC 28-lead SSOP (Pb-free) MSL3 WM8778SEDS/RV -25 to +85oC 28-lead SSOP (Pb-free, tape and reel) MSL3 PEAK SOLDERING TEMP 260°C 260°C Note: Reel quantity = 2,000 w PD, Rev 4.2, July 2008 3 WM8778 Production Data PIN DESCRIPTION PIN NAME TYPE 1 AINL Analogue Input DESCRIPTION 2 ZFLAGR Digital Output Right channel zero flag output (external pull-up required) 3 ZFLAGL Digital Output Left channel zero flag output (external pull-up required) 4 DACBCLK 5 DACMCLK Digital Input Master DAC clock; 256, 384, 512 or 768fs (fs = word clock frequency) 6 DIN Digital Input DAC data input 7 DACLRC Left channel input Digital Input/Output DAC audio interface bit clock Digital Input/Output DAC left/right word clock Digital Input/Output ADC audio interface bit clock 8 ADCBCLK 9 ADCMCLK Digital Input 10 DOUT Digital Output 11 ADCLRC 12 DGND Supply Digital negative supply 13 DVDD Supply Digital positive supply 14 MODE Digital Input Control interface mode select, tri-level 15 CE\I2S Digital Input Serial interface Latch signal 16 DI\DEEMPH 17 CL\IWL Digital Input 18 VOUTL Analogue Output DAC channel left output 19 VOUTR Analogue Output DAC channel right output 20 VMIDDAC Analogue Output DAC midrail decoupling pin ; 10uF external decoupling 21 DACREFN Analogue Input DAC negative reference input 22 DACREFP Analogue Input DAC positive reference input 23 VMIDADC Analogue Output ADC midrail divider decoupling pin; 10uF external decoupling 24 ADCREFGND Analogue Output ADC reference buffer decoupling pin; 10uF external decoupling 25 ADCREFP Analogue Output ADC positive reference decoupling pin; 10uF external decoupling 26 AVDD Supply 27 AGND Supply 28 AINR Analogue Input Master ADC clock; 256, 384, 512 or 768fs (fs = word clock frequency) ADC data output Digital Input/Output ADC left/right word clock Digital Input/Output Serial interface data Serial interface clock Analogue positive supply Analogue negative supply and substrate connection Right channel input Note : Digital input pins have Schmitt trigger input buffers. w PD, Rev 4.2, July 2008 4 WM8778 Production Data 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