WM8728

w 24-bit, 192kHz Stereo DAC with Volume Control DESCRIPTION The WM8728 is a high performance stereo DAC designed for audio applications such as DVD, home theatre systems, and digital TV. The WM8728 supports PCM data input word lengths from 16 to 32-bits and sampling rates up to 192kHz. The WM8728 consists of a serial interface port, digital interpolation filters, multi-bit sigma delta modulators and stereo DAC in a small 20-pin SSOP package. The WM8728 also includes a digitally controllable mute and attenuate function for each channel. The WM8728 supports a variety of connection schemes for audio DAC control. The 2 or 3-wire 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 The WM8728 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. WM8728 FEATURES • • Stereo DAC with 24 bit PCM Audio Performance • • • 106dB SNR (‘A’ weighted @ 48kHz) DAC - -97dB THD DAC Sampling Frequency: 8kHz - 192kHz 2 or 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 20-pin 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 W OLFSON MICROELECTRONICS plc w :: www.wolfsonmicro.com Production Data, April 2004, Rev 4.2 Copyright 2004 Wolfson Microelectronics plc WM8728 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 .....................................................................................................4 ABSOLUTE MAXIMUM RATINGS..............................................................................5 DC ELECTRICAL CHARACTERISTICS .....................................................................6 ELECTRICAL CHARACTERISTICS ...........................................................................6 TERMINOLOGY ................................................................................................................. 7 MASTER CLOCK TIMING .................................................................................................. 8 DIGITAL AUDIO INTERFACE ............................................................................................ 8 POWER SUPPLY TIMING ................................................................................................. 9 MPU 3-WIRE INTERFACE TIMING ..................................................................................10 MPU 2-WIRE INTERFACE TIMING ..................................................................................11 DEVICE DESCRIPTION............................................................................................12 INTRODUCTION ...............................................................................................................12 CLOCKING SCHEMES .....................................................................................................12 DIGITAL AUDIO INTERFACE ...........................................................................................13 AUDIO DATA SAMPLING RATES.....................................................................................15 HARDWARE CONTROL MODES .....................................................................................16 SOFTWARE CONTROL INTERFACE...............................................................................18 REGISTER MAP ...............................................................................................................19 ATTENUATION CONTROL...............................................................................................20 DIGITAL FILTER CHARACTERISTICS.............................................................................23 DAC FILTER RESPONSES...............................................................................................23 DIGITAL DE-EMPHASIS CHARACTERISTICS ........................................................24 APPLICATIONS INFORMATION ..............................................................................25 RECOMMENDED EXTERNAL COMPONENTS (PCM AUDIO).........................................25 RECOMMENDED EXTERNAL COMPONENTS VALUES .................................................25 RECOMMENDED ANALOGUE LOW PASS FILTER FOR PCM DATA FORMAT (OPTIONAL)......................................................................................................................26 PACKAGE DIMENSIONS .........................................................................................27 IMPORTANT NOTICE ...............................................................................................28 ADDRESS: ........................................................................................................................28 w PD Rev 4.2 April 2004 2 WM8728 Production Data PIN CONFIGURATION ORDERING INFORMATION DEVICE XWM8728EDS W M8728SEDS XWM8728EDS/R W M8728SEDS/R Note: Reel quantity = 2,000 TEMP. RANGE -25 to +85oC -25 to +85 C -25 to +85oC -25 to +85oC o PACKAGE 20-pin SSOP 20-pin SSOP (lead free) 20-pin SSOP (tape and reel) 20-pin SSOP (lead free, tape and reel) MOISTURE SENSITIVITY LEVEL MSL1 MSL1 MSL1 MSL1 PEAK SOLDERING TEMP 260°C 260°C 260°C 260°C w PD Rev 4.2 April 2004 3 WM8728 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 NAME LRCIN DIN BCKIN MCLK ZERO DGND DVDD VOUTR AGND AVDD VOUTL VMID VREFN VREFP CSBIWL MODE MUTEB SDIDEM SCK LATI2S TYPE Digital Input Digital Input Digital Input Digital Input Digital Output (Open drain) Supply Supply Analogue Output Supply Supply Analogue Output Analogue Output Supply Supply Digital Input (pull-up) Digital Input (pull-down) Digital Bi-directional Digital Bi-directional Digital Input (pull-down) Digital Input (pull-up) DESCRIPTION DAC Sample Rate Clock Input: PCM Input Mode Serial Audio Data Input: PCM Input Mode Audio Data Bit Clock Input Master Clock Input Infinite ZERO Detect Flag (L = IDZ detected, H = IDZ not detected). Digital Ground Supply Digital Positive Supply Right Channel DAC Output Analogue Ground Supply Analogue Positive Supply Left Channel DAC Output Mid Rail Decoupling Point DAC Negative Reference – normally AGND, must not be below AGND DAC Positive Reference – normally AVDD, must not be above AVDD Software Mode: 3-Wire Serial Control Chip Select Hardware Mode: Input Word Length Control Mode Selection (L = Hardware, H = Software) Mute Control (L = Mute on, H = Mute off, Z = Automute Enabled) Software Mode: 3 or 2-Wire Serial Control Data Input: Hardware Mode: De-Emphasis Select Software Mode: 3 or 2-Wire Serial Control Clock Input Software Mode 3-Wire Serial Control Load Input Hardware Mode: Input Data Format Selection Note: Digital input pins have Schmitt trigger input buffers. w PD Rev 4.2 April 2004 4 WM8728 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