WM8501

w DESCRIPTION The WM8501 is a high performance stereo DAC with an integrated 1.7Vrms line driver. It is designed for audio applications that require a high voltage output along with enhanced load drive capability. The WM8501 supports data input word lengths from 16 to 24-bits and sampling rates up to 192kHz. The WM8501 consists of a serial interface port, digital interpolation filters, multi-bit sigma delta modulators and stereo DAC in a 14lead SOIC package. The hardware control interface is used for the selection of audio data interface format, enable and de-emphasis. The WM8501 supports I2S, right Justified or DSP interfaces. Operating on separate analog and digital supplies the WM8501 offers very lower power consumption from the digital section, whilst supporting enhanced load drive from the analogue output. WM8501 24-bit 192kHz Stereo DAC with 1.7Vrms Line Driver FEATURES • • Stereo DAC with 1.7Vrms line driver from 5V analogue supply Audio performance 100dB SNR (‘A’ weighted @ 48kHz) -88dB THD DAC Sampling Frequency: 8kHz – 192kHz Pin Selectable Audio Data Interface Format I2S, 16-bit Right Justified or DSP 14-lead SOIC package 4.5V - 5.5V analogue, 2.7V - 5.5V digital supply operation • • • • APPLICATIONS • • • STB DVD Digital TV BLOCK DIAGRAM W OLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews/ Pre-Production, May 2006, Rev 3.1 Copyright 2006 Wolfson Microelectronics plc WM8501 Pre-Production 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 RECOMMENDED OPERATING CONDITIONS ..........................................................5 DC ELECTRICAL CHARACTERISTICS .....................................................................6 ELECTRICAL CHARACTERISTICS ...........................................................................6 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.............................................................................14 DAC FILTER RESPONSES...............................................................................................14 DIGITAL DE-EMPHASIS CHARACTERISTICS ........................................................15 APPLICATIONS INFORMATION ..............................................................................16 RECOMMENDED EXTERNAL COMPONENTS .......................................................16 POWER UP/DOWN SEQUENCE......................................................................................17 RECOMMENDED ANALOGUE LOW PASS FILTER ........................................................17 PCB LAYOUT RECOMMENDATIONS ..............................................................................18 PACKAGE DRAWING...............................................................................................19 IMPORTANT NOTICE ...............................................................................................20 ADDRESS: ........................................................................................................................20 w PP Rev 3.1 May 2006 2 Pre-Production WM8501 PIN CONFIGURATION ORDERING INFORMATION DEVICE W M8501GED/V W M8501GED/RV TEMPERATURE RANGE -25 to +85oC -25 to +85oC PACKAGE 14-lead SOIC (Pb-free) 14-lead SOIC (Pb-free, tape and reel) MOISTURE SENSITIVITY LEVEL MSL3 MSL3 PEAK SOLDERING TEMPERATURE 260°C 260°C Note: Reel quantity = 3,000 w PP Rev 3.1 May 2006 3 WM8501 Pre-Production PIN DESCRIPTION PIN 1 2 3 4 5 6 7 8 9 10 11 12 NAME LRCLK DIN BCLK ENABLE VMID ROUT AGND AVDD LOUT DGND DVDD DEEMPH TYPE Digital input Digital input Digital input Digital input Analogue output Analogue output Supply Supply Analogue output Digital Supply Digital Supply Digital input Sample rate clock input Serial audio data input Bit clock input Enable input – 0 = powered down, 1 = enabled Analogue internal reference Right channel DAC output Ground reference for analog circuits and substrate connection Positive supply for analog circuits Left channel DAC output Digital ground supply Digital positive supply 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 DSP (Mode B) High = 16-24-bit I2S or DSP (Mode A) Master clock input DESCRIPTION 13 FORMAT Digital input 14 MCLK Digital input Note: 1. Digital input pins have Schmitt trigger input buffers. w PP Rev 3.1 May 2006 4 Pre-Production WM8501 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