WM8738

w 24 Bit Stereo ADC DESCRIPTION The WM8738 is a high performance stereo audio ADC designed for consumer applications. Stereo line-level audio inputs are provided, along with a control input pin to allow operation of the audio interface in either one of two industry standard modes. The device also has a selectable digital high pass filter to remove residual DC offsets. Stereo 24-bit multi-bit sigma delta ADCs are provided, along with oversampling digital interpolation filters. 24-bit digital audio output word lengths and sampling rates from 32kHz to 96kHz are supported. The device is available in a small 14-pin SOIC package. WM8738 FEATURES • • • • • • • Audio Performance - 90 dB SNR (‘A’ weighted @ 48kHz) 3.0 – 5.5V Analogue Supply Operation 3.0 – 3.6V Digital Supply Operation ADC Sampling Frequency: 32kHz – 96kHz Selectable ADC High Pass Filter Selectable Audio Data Interface Modes - I2S or Left Justified 14-pin SOIC Package APPLICATIONS • • • CD and Minidisc Recorders DVD Players General Purpose Audio Conversion BLOCK DIAGRAM WOLFSON MICROELECTRONICS plc www.wolfsonmicro.com Production Data, November 2004, Rev 4.3 Copyright  2004 Wolfson Microelectronics plc WM8738 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 RECOMMENDED OPERATING CONDITIONS .....................................................5 ELECTRICAL CHARACTERISTICS ......................................................................6 TERMINOLOGY .....................................................................................................7 DIGITAL AUDIO INTERFACE TIMING ..................................................................8 DEVICE DESCRIPTION.........................................................................................9 INTRODUCTION ........................................................................................................... 9 ADC............................................................................................................................... 9 ADC DIGITAL FILTER................................................................................................... 9 AUDIO DATA SAMPLING RATES............................................................................... 10 DIGITAL AUDIO INTERFACES................................................................................... 11 DIGITAL FILTER CHARACTERISTICS ...............................................................12 ADC FILTER RESPONSES .................................................................................12 ADC HIGH PASS FILTER ........................................................................................... 12 APPLICATIONS INFORMATION .........................................................................13 RECOMMENDED EXTERNAL COMPONENTS .......................................................... 13 RECOMMENDED EXTERNAL COMPONENTS VALUES ........................................... 13 PACKAGE DIMENSIONS ....................................................................................14 IMPORTANT NOTICE ..........................................................................................15 ADDRESS: .................................................................................................................. 15 w PD Rev 4.3 November 2004 2 WM8738 Production Data PIN CONFIGURATION DVDD SDATO BCLK FMT CAP VREF RIN 1 2 3 4 5 6 7 WM8738 14 13 12 11 10 9 8 DGND MCLK LRCLK NOHP AGND AVDD LIN ORDERING INFORMATION DEVICE TEMPERATURE RANGE -25 to +85 C -25 to +85oC -25 to +85oC -25 to +85oC o PACKAGE MOISTURE SENSITIVITY LEVEL PEAK SOLDERING TEMPERATURE W M8738ED 14-pin SOIC 14-pin SOIC (tape and reel) 14-pin SOIC (lead free) 14-pin SOIC (lead free, tape and reel) MSL 1 240°C W M8738ED/R MSL 1 240°C W M8738GED/V MSL 2 260°C W M8738GED/RV Note: Reel quantity = 3,000 MSL 2 260°C w PD Rev 4.3 November 2004 3 WM8738 PIN DESCRIPTION PIN 1 2 3 4 NAME DVDD SDATO BCLK FMT TYPE Supply Digital Output Digital Input Digital input (with pull down) Digital positive supply ADC digital data output ADC audio interface data clock (5V tolerant) Audio interface format selection (5V tolerant) 2 ‘0’ = I S ‘1’ = Left Justified Reference de-coupling pin Buffered reference decoupling pin Right channel ADC input Left channel ADC input Analogue positive supply Analogue ground supply and chip substrate Digital highpass filter bypass; (5V tolerant) ‘0’ = Enabled ‘1’ = Bypassed Data left/right word clock (5V tolerant) Master clock input (5V tolerant) Digital supply ground DESCRIPTION Production Data 5 6 7 8 9 10 11 CAP VREF RIN LIN AVDD AGND NOHP Analog Analogue output Analogue Input Analogue Input Supply Supply Digital input (with pull down) 12 13 14 Notes LRCLK MCLK DGND Digital Input Digital Input Supply 1. Digital input pins have Schmitt trigger input buffers and are 5V tolerant. w PD Rev 4.3 November 2004 4 WM8738 ABSOLUTE MAXIMUM RATINGS Production Data 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