WM8706

w DESCRIPTION The WM8706 is a high performance stereo DAC designed for audio applications such as DVD, home theatre systems, and digital TV. The WM8706 supports data input word lengths from 16 to 32-bits and sampling rates up to 192kHz. The WM8706 can implement 2 channels at 192kHz for highend DVD-Audio. The WM8706 consists of a serial interface port, digital interpolation filters, multi-bit sigma delta modulators and stereo DAC in a small 28-lead SSOP package. The WM8706 also includes a digitally controllable mute and attenuate function on each channel. The WM8706 supports a variety of connection schemes for audio DAC control. The MPU serial port provides access to a wide range of features including on-chip mute, attenuation and phase reversal. A hardware controllable interface is also available. It is pin-compatible with the WM8716 provided the oscillator circuit on WM8716 is not required in the application. The WM8706 is an ideal device to interface to AC-3, DTS, and MPEG audio decoders for surround sound applications, or for use in DVD players supporting DVD-A. WM8706 24-bit, 192kHz Stereo DAC with Volume Control FEATURES • • Stereo DAC Audio Performance • • • 106dB SNR (‘A’ weighted @ 48kHz) DAC -97dB THD DAC Sampling Frequency: 8kHz – 192kHz 3-Wire Serial Control Interface or Hardware Control Programmable Audio Data Interface Modes I2S, Left, Right Justified, DSP 16/20/24/32 bit Word Lengths Independent Digital Volume Control on Each Channel with 127.5dB Range in 0.5dB Steps 3.0V – 5.5V Supply Operation 28-Lead SSOP Package Exceeds Dolby Class A Performance Requirements • • • • APPLICATIONS • • • • DVD-Audio and DVD ‘Universal’ Players Home theatre systems Digital TV Digital broadcast receivers BLOCK DIAGRAM MODE MLIIS MCDM1 MDDM0 MUTEB CSBIWO ZERO w CONTROL INTERFACE WM8706 BCKIN LRCIN DIN SERIAL INTERFACE MUTE/ ATTEN DIGITAL FILTERS MUTE/ ATTEN SIGMA DELTA MODULATOR RIGHT DAC LOW PASS FILTER VOUTR SIGMA DELTA MODULATOR LEFT DAC LOW PASS FILTER VOUTL VMID XTI AVDD DVDD VREFP VREFN AGND DGND W OLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews/ Production Data, July 2005, Rev 4.1 Copyright 2005 Wolfson Microelectronics plc WM8706 Production Data TABLE OF CONTENTS DESCRIPTION ............................................................................................................1 FEATURES..................................................................................................................1 APPLICATIONS ..........................................................................................................1 BLOCK DIAGRAM ......................................................................................................1 PIN CONFIGURATION................................................................................................3 ORDERING INFORMATION .......................................................................................3 PIN DESCRIPTION .....................................................................................................4 ABSOLUTE MAXIMUM RATINGS..............................................................................5 DC ELECTRICAL CHARACTERISTICS .....................................................................6 ELECTRICAL CHARACTERISTICS ...........................................................................6 TERMINOLOGY ................................................................................................................. 7 MASTER CLOCK TIMING .................................................................................................. 8 DIGITAL AUDIO INTERFACE ............................................................................................ 8 MPU INTERFACE TIMING ................................................................................................. 9 DEVICE DESCRIPTION............................................................................................10 INTRODUCTION ...............................................................................................................10 CLOCKING SCHEMES .....................................................................................................10 DIGITAL AUDIO INTERFACE ...........................................................................................10 AUDIO DATA SAMPLING RATES.....................................................................................13 HARDWARE CONTROL MODES .....................................................................................13 SOFTWARE CONTROL INTERFACE...............................................................................15 REGISTER MAP ...............................................................................................................16 ATTENUATION CONTROL...............................................................................................18 DIGITAL FILTER CHARACTERISTICS ....................................................................21 DAC FILTER RESPONSES...............................................................................................21 DIGITAL DE-EMPHASIS CHARACTERISTICS ........................................................22 RECOMMENDED EXTERNAL COMPONENTS .......................................................23 RECOMMENDED EXTERNAL COMPONENT VALUES ...................................................23 RECOMMENDED ANALOGUE LOW PASS FILTER (OPTIONAL) .........................24 PACKAGE DIMENSIONS .........................................................................................25 IMPORTANT NOTICE ...............................................................................................26 ADDRESS: ........................................................................................................................26 w PD Rev 4.1 July 2005 2 WM8706 Production Data PIN CONFIGURATION LRCIN DIN BCKIN NC XTI NC DGND DVDD NC NC NC NC VOUTR AGND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 MLIIS MCDM1 MDDM0 MUTEB MODE CSBIWO NC ZERO VREFP VREFN VMID NC VOUTL AVDD ORDERING INFORMATION DEVICE WM8706SEDS TEMPERATURE RANGE -25 to +85oC PACKAGE MOISTURE SENSITIVITY LEVEL MSL 1 PEAK SOLDERING TEMPERATURE 260oC 28-lead SSOP (lead free) 28-lead SSOP (lead free, tape and reel) WM8706SEDS/R -25 to +85oC MSL 1 260oC Note: Reel quantity = 2,000 w PD Rev 4.1 July 2005 3 WM8706 Production Data 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 CSBIWO MODE MUTEB MDDM0 MCDM1 MLIIS VMID VREFN VREFP ZERO VOUTR AGND AVDD VOUTL DGND DVDD ZERO NAME LRCIN DIN BCKIN TYPE Digital Input Digital Input Digital Input NC NC Supply Supply NC NC NC NC Analogue Output Supply Supply Analogue Output NC Analogue Output Supply Supply Digital Output NC Digital Input Digital Input Digital Bi-directional Digital Bi-directional Digital Input Digital Input Serial Audio Data Input Audio Data Bit Clock Input. No internal connection No Internal Connection Digital Ground Supply Digital Positive Supply No Internal Connection No Internal Connection No Internal Connection No Internal Connection Right Channel DAC Output Analogue Ground Supply Analogue Positive Supply Left Channel DAC Output No Internal Connection Mid Rail Decoupling Point DAC Negative Reference – normally AGND, must not be below AGND DAC Positive Reference – normally AVDD, must not be above AVDD Infinite Zero Detect Flag No Internal Connection Software Mode: 3-Wire Serial Control Chip Select Hardware Mode: Input Word Length, Pull Up Control Mode Selection (Low = Hardware, High = Software), Pull Down Mute Control (L = Mute on, H = Mute off, Z = Automute Enabled), Pull Up Software Mode: 3-Wire Serial Control Data Input: Hardware Mode: De-Emphasis Software Mode: 3-Wire Serial Control Clock Input Hardware Mode: De-Emphasis, Pull Down Software Mode 3-Wire Serial Control Load Input Hardware Mode: Input Data Format Selection, Pull Up DESCRIPTION DAC Sample Rate Clock Input Digital Output (Open Drain) Infinite ZERO Detect Flag (L=IZD detected, H=IZD not detected) Note: Digital input pins have Schmitt trigger input buffers. w PD Rev 4.1 July 2005 4 WM8706 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