WM8521_06

w DESCRIPTION The WM8521 is a 192kHz stereo DAC with an integrated output op-amp stage, designed to generate a 2.0Vrms output signal directly, so reducing external component requirements in digital audio applications. WM8521 comes into two variants WM8521HC and WM8521H9 which offers different line drive output capabilities. WM8521HC outputs 2Vrms at 12V supply, while WM8521H9 outputs 2.0Vrms at 9V supply. WM8521HC/H9 are designed for cost sensitive consumer digital audio applications requiring 2Vrms line output. A 24-bit multi-bit sigma delta DAC is used with oversampling digital interpolation filters. Digital audio input word lengths from 16-32 bits and sampling rates from 8kHz to 192kHz are supported. The audio interface supports I S, Right Justified and DSP digital audio formats. The devices are controlled via a hardware interface which provides access to features including de-emphasis, mute and data formats. These devices are pin equivalent and are available in a 14-lead SOIC package. 2 WM8521 Stereo DAC with Integrated Output Stage for 2Vrms LINE OUT FEATURES • • • • • • Audio Performance - DAC SNR 98dB (‘A’ weighted @ 48kHz) - THD -81dB (‘A’ weighted @ 48kHz) DAC Sampling Frequency: 8kHz – 192kHz Pin Selectable Audio Data Interface Format - I2S, 16-bit Right Justified or 16bit DSP 2.0 Vrms output at 12V or 9V supply 7.6V to 13.2V Analogue, 2.7V to 3.6 Digital Supply 14-lead SOIC Package APPLICATIONS • Consumer digital audio applications requiring 2 Vrms output - DVD Players - Digital TV - Digital Set Top Boxes - A/V Receivers BLOCK DIAGRAM WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews/ Production Data, August 2006, Rev 4.1 Copyright 2006 Wolfson Microelectronics plc WM8521 TABLE OF CONTENTS Production Data 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 DEVICE DESCRIPTION.........................................................................................9 GENERAL INTRODUCTION.......................................................................................... 9 DAC CIRCUIT DESCRIPTION....................................................................................... 9 CLOCKING SCHEMES ................................................................................................ 10 DIGITAL AUDIO INTERFACE...................................................................................... 10 AUDIO DATA SAMPLING RATES ............................................................................... 12 HARDWARE CONTROL MODES................................................................................ 13 DIGITAL FILTER CHARACTERISTICS ....................................................................... 15 DAC FILTER RESPONSES ......................................................................................... 15 DIGITAL DE-EMPHASIS CHARACTERISTICS ........................................................... 16 APPLICATIONS INFORMATION .........................................................................17 RECOMMENDED EXTERNAL COMPONENTS........................................................... 17 RECOMMENDED EXTERNAL COMPONENTS VALUES............................................ 17 RECOMMENDED ANALOGUE LOW PASS FILTER ................................................... 18 PCB LAYOUT RECOMMENDATIONS......................................................................... 18 PACKAGE DRAWING..........................................................................................19 IMPORTANT NOTICE ..........................................................................................20 ADDRESS:................................................................................................................... 20 w PD Rev 4.1 August 2006 2 Production Data WM8521 PIN CONFIGURATION ORDERING INFORMATION DEVICE W M8521HCGED/V W M8521HCGED/RV TEMPERATURE RANGE -25 to +85oC -25 to +85oC PACKAGE 14-lead SOIC (Pb- free) 14-lead SOIC (Pb-free, tape and reel) 14-lead SOIC (Pb-free) 14-lead SOIC (Pb-free, tape and reel) MOISTURE SENSITIVITY LEVEL MSL1 MSL1 PEAK SOLDERING TEMPERATURE 260oC 260oC W M8521H9GED/V W M8521H9GED/RV -25 to +85oC -25 to +85 C o MSL1 MSL1 260oC 260oC Note: 1. 2. 3. Reel quantity = 3,000 WM8521H9: 2Vrms output at 9V supply WM8521HC: 2Vrms output at 12V supply w PD Rev 4.1 August 2006 3 WM8521 PIN DESCRIPTION PIN 1 2 3 4 5 NAME DGND LRCLK DIN BCLK MUTE Supply Digital input Digital input Digital input Digital input TYPE Digital Negative supply Sample rate clock input Serial audio data input Bit clock input Soft mute control, Internal pull down High Impedance = Automute High = Mute ON Low = Mute OFF Right channel DAC output Analogue Negative supply Analogue internal reference Analogue Positive supply Left channel DAC output De-emphasis select, Internal pull down High = de-emphasis ON Low = de-emphasis OFF Data input format select, Internal pull up Low = 16-bit right justified or 16bit DSP ‘Mode A’ High = 16-32-bit I2S or 16bit DSP ‘Mode B’ Master clock input Digital Positive supply DESCRIPTION Production Data 6 7 8 9 10 11 VOUTR AGND CAP AVDD VOUTL DEEMPH Analogue output Supply Analogue output Supply Analogue output Digital input 12 FORMAT Digital input 13 14 Note: 1. MCLK DVDD Digital input Supply Digital input pins have Schmitt trigger input buffers. w PD Rev 4.1 August 2006 4 Production Data WM8521 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