WM8778SEDS

w 24-bit, 192kHz Stereo CODEC DESCRIPTION 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. 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-pin SSOP package. WM8778 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 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 BLOCK DIAGRAM WOLFSON MICROELECTRONICS plc w :: www.wolfsonmicro.com Production Data, April 2005, Rev 4.0 Copyright 2005 Wolfson Microelectronics plc WM8778 TABLE OF CONTENTS Production Data 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 4.0 April 2005 2 Production Data WM8778 PIN CONFIGURATION ORDERING INFORMATION DEVICE W M8778SEDS W M8778SEDS/R Note: Reel quantity = 2,000 TEMP. RANGE -25 to +85oC -25 to +85oC PACKAGE 28-pin SSOP (Pb-free) 28-pin SSOP (Pb-free, tape and reel) MOISTURE SENSITIVITY LEVEL MSL1 MSL1 PEAK SOLDERING TEMP 260°C 260°C w PD Rev 4.0 April 2005 3 WM8778 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 NAME AINL ZFLAGR ZFLAGL DACBCLK DACMCLK DIN DACLRC ADCBCLK ADCMCLK DOUT ADCLRC DGND DVDD MODE CE\I2S DI\DEEMPH CL\IWL VOUTL VOUTR VMIDDAC DACREFN DACREFP VMIDADC ADCREFGND ADCREFP AVDD AGND AINR TYPE Analogue Input Digital Output Digital Output Digital Input Digital Input Left channel input Right channel zero flag output (external pull-up required) Left channel zero flag output (external pull-up required) DESCRIPTION Production Data Digital Input/Output DAC audio interface bit clock Master DAC clock; 256, 384, 512 or 768fs (fs = word clock frequency) DAC data input Digital Input/Output DAC left/right word clock Digital Input/Output ADC audio interface bit clock Digital Input Digital Output Supply Supply Digital Input Digital Input Digital Input Analogue Output Analogue Output Analogue Output Analogue Input Analogue Input Analogue Output Analogue Output Analogue Output Supply Supply Analogue Input Master ADC clock; 256, 384, 512 or 768fs (fs = word clock frequency) ADC data output Digital negative supply Digital positive supply Control interface mode select, tri-level Serial interface Latch signal Serial interface clock DAC channel left output DAC channel right output DAC midrail decoupling pin ; 10uF external decoupling DAC negative reference input DAC positive reference input ADC midrail divider decoupling pin; 10uF external decoupling ADC reference buffer decoupling pin; 10uF external decoupling ADC positive reference decoupling pin; 10uF external decoupling Analogue positive supply Analogue negative supply and substrate connection Right channel input Digital Input/Output ADC left/right word clock Digital Input/Output Serial interface data Note : Digital input pins have Schmitt trigger input buffers. w PD Rev 4.0 April 2005 4 Production Data WM8778 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