WM8766

w 24-bit, 192kHz 6-Channel DAC DESCRIPTION The WM8766 is a multi-channel audio DAC ideal for DVD and surround sound processing applications for home hi-fi, automotive and other audio visual equipment. Three stereo 24-bit multi-bit sigma delta DACs are used with oversampling digital interpolation filters. Digital audio input word lengths from 16-32 bits and sampling rates from 8kHz to 192kHz are supported. Each DAC channel has independent digital volume and mute control. The audio data interface supports I2S, left justified, right justified and DSP digital audio formats The device is controlled via a 3 wire serial interface or directly using the hardware interface. These interfaces provide access to features including channel selection, volume controls, mutes, de-emphasis and power management facilities. The device is available in a 28-lead SSOP. WM8766 FEATURES • • • • • 6-Channel DAC Audio Performance − 103dB SNR (‘A’ weighted @ 48kHz) DAC DAC Sampling Frequency: 8kHz – 192kHz 3-Wire SPI Serial or Hardware Control Interface Programmable Audio Data Interface Modes − I2S, Left, Right Justified or DSP − 16/20/24/32 bit Word Lengths Three Independent stereo DAC outputs with independent digital volume controls Master or Slave Audio Data Interface 2.7V to 5.5V Analogue, 2.7V to 3.6V Digital supply Operation 28 lead SSOP Package • • • • APPLICATIONS • • • DVD Players Surround Sound AV Processors and Hi-Fi systems Automotive Audio BLOCK DIAGRAM WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews/ Production Data, July 2005, 4.1 Copyright 2005 Wolfson Microelectronics plc WM8766 TABLE OF CONTENTS Production Data DESCRIPTION .......................................................................................................1 FEATURES.............................................................................................................1 APPLICATIONS .....................................................................................................1 BLOCK DIAGRAM .................................................................................................1 TABLE OF CONTENTS .........................................................................................2 PIN CONFIGURATION 28 LEAD SSOP ...............................................................3 ORDERING INFORMATION ..................................................................................3 PIN DESCRIPTION – 28 LEAD SSOP...................................................................4 ABSOLUTE MAXIMUM RATINGS.........................................................................5 RECOMMENDED OPERATING CONDITIONS .....................................................6 ELECTRICAL CHARACTERISTICS ......................................................................6 TERMINOLOGY ............................................................................................................ 7 MASTER CLOCK TIMING ............................................................................................. 7 DIGITAL AUDIO INTERFACE – MASTER MODE ......................................................... 8 DIGITAL AUDIO INTERFACE – SLAVE MODE ............................................................ 9 MPU INTERFACE TIMING .......................................................................................... 10 INTERNAL POWER ON RESET CIRCUIT ..........................................................11 DEVICE DESCRIPTION.......................................................................................12 INTRODUCTION ......................................................................................................... 12 AUDIO DATA SAMPLING RATES............................................................................... 12 HARDWARE CONTROL MODES ............................................................................... 13 DIGITAL AUDIO INTERFACE ..................................................................................... 15 POWERDOWN MODES ............................................................................................. 18 SOFTWARE CONTROL INTERFACE OPERATION................................................... 19 CONTROL INTERFACE REGISTERS ........................................................................ 19 REGISTER MAP...................................................................................................30 DIGITAL FILTER CHARACTERISTICS ...............................................................31 DAC FILTER RESPONSES .................................................................................31 DIGITAL DE-EMPHASIS CHARACTERISTICS........................................................... 32 APPLICATIONS INFORMATION .........................................................................33 RECOMMENDED EXTERNAL COMPONENTS .......................................................... 33 SUGGESTED ANALOGUE LOW PASS POST DAC FILTERS ................................... 34 PACKAGE DIMENSIONS ....................................................................................35 IMPORTANT NOTICE ..........................................................................................36 ADDRESS: .................................................................................................................. 36 w PD Rev 4.1 July 2005 2 Production Data WM8766 PIN CONFIGURATION 28 LEAD SSOP ORDERING INFORMATION DEVICE W M8766GEDS/V W M8766GEDS/RV TEMPERATURE RANGE -25 to +85oC -25 to +85oC PACKAGE 28-lead SSOP (Pb-free) 28-lead SSOP (Pb-free, tape and reel) MOISTURE SENSITIVITY LEVEL MSL3 MSL3 PEAK SOLDERING TEMPERATURE 260°C 260°C Note: Reel quantity = 2,000 w PD Rev 4.1 July 2005 3 WM8766 PIN DESCRIPTION – 28 LEAD SSOP PIN 1 NAME MODE TYPE Digital input Control format selection 0 = Software control 1 = Hardware control DESCRIPTION Production Data 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 MCLK BCLK LRCLK DVDD DGND DIN1 DIN2 DIN3 DNC ML/I2S MC/IWL MD/DM MUTE TESTREF VREFN VREFP VMID NC NC VOUT1L VOUT1R VOUT2L VOUT2R VOUT3L VOUT3R AGND AVDD Digital input Digital input/output Digital input/output Supply Supply Digital input Digital input Digital input Do not connect Digital input Digital input Digital input Digital input/output Analogue output Supply Supply Analogue output No connect No connect Analogue output Analogue output Analogue output Analogue output Analogue output Analogue output Supply Supply Master clock; 128, 192, 256, 384, 512 or 768fs (fs = word clock frequency) Audio interface bit clock Audio left/right word clock Digital positive supply Digital negative supply DAC channel 1 data input DAC channel 2 data input DAC channel 3 data input Do not connect Software Mode: Serial interface Latch signal Hardware Mode: Input Audio Data Format Software Mode: Serial control interface clock Hardware Mode: Audio data input word length Software Mode: Serial interface data Hardware Mode: De-emphasis selection DAC Zero Flag output or DAC mute input Test reference DAC negative supply DAC positive reference supply Midrail divider decoupling pin; 10uF external decoupling No internal connection No internal connection DAC channel 1 left output DAC channel 1 right output DAC channel 2 left output DAC channel 2 right output DAC channel 3 left output DAC channel 3 right output Analogue negative supply and substrate connection Analogue positive supply Note: Digital input pins have Schmitt trigger input buffers. w PD Rev 4.1 July 2005 4 Production Data WM8766 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