WM8759_06

w DESCRIPTION The WM8759 is a high performance stereo DAC with an integrated headphone driver. It is designed for audio applications such as portable DVD, MP3 players or consumer equipment with line output and headphone output connections. The WM8759 supports data input word lengths from 16 to 24-bits and sampling rates up to 192kHz. The WM8759 consists of a serial interface port, digital interpolation filters, multi-bit sigma delta modulators and stereo DAC in a 14-pin SOIC package. The hardware control interface is used for the selection of audio data interface format, enable and de-emphasis. The WM8759 supports I2S, right Justified or DSP interfaces. Operating on split analog digital supplies the WM8759 allows very lower power consumption from the digital section, whilst supporting large output powers from the analog headphone driver. WM8759 24-bit 192kHz Stereo DAC with Headphone Buffer FEATURES • • • Stereo DAC with headphone driver 50mW power into 16R load on 3.3V supply Audio Performance • • • • • 100dB SNR (‘A’ weighted @ 48kHz) -88dB THD line level -72dB THD headphone DAC Sampling Frequency: 8kHz – 192kHz Pin Selectable Audio Data Interface Format I2S, 16-bit Right Justified or DSP 2.7V - 5.5V Supply Operation, Split Analog-digital supplies 14-lead SOIC Package Typical power consumption 20mW on 2.7V supply APPLICATIONS • • • Portable music Players Home music players Digital TV BLOCK DIAGRAM W OLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews/ Pre-Production, June 2006, Rev 3.1 Copyright 2006 Wolfson Microelectronics plc WM8759 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 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.....................................................................................13 HARDWARE CONTROL MODES .....................................................................................14 DIGITAL FILTER CHARACTERISTICS.............................................................................15 DAC FILTER RESPONSES...............................................................................................15 DIGITAL DE-EMPHASIS CHARACTERISTICS.................................................................16 APPLICATIONS INFORMATION ..............................................................................17 RECOMMENDED EXTERNAL COMPONENTS ................................................................17 POWER UP/DOWN SEQUENCE......................................................................................17 PCB LAYOUT RECOMMENDATIONS ..............................................................................18 PACKAGE DRAWING...............................................................................................19 IMPORTANT NOTICE ...............................................................................................20 ADDRESS: ........................................................................................................................20 w PP Rev 3.1 June 2006 2 Pre-Production WM8759 PIN CONFIGURATION ORDERING INFORMATION DEVICE W M8759GED/V TEMPERATURE RANGE -25 to +85oC PACKAGE 14-lead SOIC (Pb-free) 14-lead SOIC W M8759GED/RV -25 to +85 C o MOISTURE SENSITIVITY LEVEL MSL3 PEAK SOLDERING TEMPERATURE 260°C (Pb-free, tape and reel) MSL3 260°C Note: Reel quantity = 3,000 w PP Rev 3.1 June 2006 3 WM8759 Pre-Production PIN DESCRIPTION PIN 1 2 3 4 5 6 7 8 9 10 11 12 NAME LRCIN DIN BCKIN ENABLE CAP HPOUTR AGND AVDD HPOUTL 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 ‘late’ High = 16-24-bit I2S or DSP ‘early’ 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 June 2006 4 Pre-Production WM8759 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