WM8727

w 24-bit 192kHz Stereo DAC DESCRIPTION The WM8727 is a high performance stereo DAC designed for audio applications such as DVD, home theatre systems, and digital TV. The WM8727 supports data input word lengths from 16 to 24-bits and sampling rates up to 192kHz. The WM8727 consists of a serial interface port, digital interpolation filters, multi-bit sigma delta modulators and stereo DAC in a very small 8-lead SOIC package. The WM8727 supports a 16-24-bit I2S digital audio interface. The WM8727 is an ideal device to interface to AC-3, DTS, and MPEG audio decoders for surround sound applications, or for use in DVD players, including supporting the implementation of 2 channels at 192kHz for high-end DVD-Audio applications. WM8727 FEATURES • • Stereo DAC Audio Performance 98dB SNR (‘A’ weighted @ 48kHz) DAC -84dB THD DAC Sampling Frequency: 8kHz – 192kHz Audio Data Interface Format 16-24-Bit I2S 2.7V – 5.5V Supply Operation 8-lead SOIC Package Exceeds Dolby Class A Performance Requirements • • • • • APPLICATIONS • • • DVD Players Digital TV Digital Set Top Box BLOCK DIAGRAM MUTE BCKIN LRCIN DIN MUTE SERIAL INTERFACE DIGITAL FILTERS SIGMA DELTA MODULATOR RIGHT DAC LOW PASS FILTER VOUTR SIGMA DELTA MODULATOR LEFT DAC LOW PASS FILTER VOUTL W WM8727 MCLK VDD GND W OLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews/ Production Data, July 2006, Rev 4.2 Copyright 2006 Wolfson Microelectronics plc WM8727 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 .....................................................................................................3 ABSOLUTE MAXIMUM RATINGS..............................................................................4 DC ELECTRICAL CHARACTERISTICS .....................................................................4 ELECTRICAL CHARACTERISTICS ...........................................................................5 TERMINOLOGY ................................................................................................................. 6 MASTER CLOCK TIMING .................................................................................................. 6 DIGITAL AUDIO INTERFACE ............................................................................................ 6 DEVICE DESCRIPTION..............................................................................................8 GENERAL INTRODUCTION .............................................................................................. 8 DAC CIRCUIT DESCRIPTION ........................................................................................... 8 CLOCKING SCHEMES ...................................................................................................... 9 DIGITAL AUDIO INTERFACE ............................................................................................ 9 AUDIO DATA SAMPLING RATES.....................................................................................10 DIGITAL FILTER CHARACTERISTICS ....................................................................11 DAC FILTER RESPONSES...............................................................................................11 TYPICAL PERFORMANCE.......................................................................................12 APPLICATIONS INFORMATION ..............................................................................13 RECOMMENDED EXTERNAL COMPONENTS ................................................................13 RECOMMENDED EXTERNAL COMPONENTS VALUES .................................................13 RECOMMENDED ANALOGUE LOW PASS FILTER (OPTIONAL) ...................................14 PCB LAYOUT RECOMMENDATIONS ..............................................................................14 PACKAGE DRAWING...............................................................................................15 IMPORTANT NOTICE ...............................................................................................16 ADDRESS: ........................................................................................................................16 w PD Rev 4.2 July 2006 2 WM8727 Production Data PIN CONFIGURATION DIN BCKIN LRCIN MCLK 1 2 3 4 8 VOUTL VDD GND VOUTR WM8727 7 6 5 ORDERING INFORMATION DEVICE W M8727GED/V W M8727GED/RV Note: Reel Quantity = 3,000 TEMPERATURE RANGE -25 to +85oC -25 to +85oC PACKAGE 8-lead SOIC (Pb- free) 8-lead SOIC (Pb- free, tape and reel) MOISTURE SENSITIVITY LEVEL MSL2 MSL2 PEAK SOLDERING TEMPERATURE 260oC 260 C o PIN DESCRIPTION PIN 1 2 3 4 5 6 7 8 NAME DIN BCKIN LRCIN MCLK VOUTR GND VDD VOUTL TYPE Digital input Digital input Digital input Digital input Analogue output Supply Supply Analogue output Serial audio data input Bit clock input Sample rate clock input System clock input Right channel DAC output Analogue ground supply Positive supply Left channel DAC output DESCRIPTION Note: Digital input pins have Schmitt trigger input buffers. w PD Rev 4.2 July 2006 3 WM8727 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