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1 / 20 page Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or other- wise under any patent or patent rights of Analog Devices.Trademarks and registered trademarks are the property of their respective companies. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2002. All rights reserved. AD5273 64-Position OTP Digital Potentiometer GENERAL DESCRIPTION The AD5273 is a 64-position, One-Time-Programmable (OTP) digital potentiometer 4 that employs fuse link technology to achieve the permanent program setting. This device performs the same electronic adjustment function as most mechanical trimmers and variable resistors. It allows unlimited adjustments before perma- nently setting the resistance values. The AD5273 is programmed using a 2-wire, I 2C compatible digital control. During the write mode, a fuse blow command is executed after the final value is determined, therefore freezing the wiper position at a given setting (analogous to placing epoxy on a mechanical trimmer). When this permanent setting is achieved, the value will not change regardless of the supply variations or environmental stresses under normal operating conditions. To verify the success of permanent programming, Analog Devices patterned the OTP validation such that the fuse status can be discerned from two validation bits in the read mode. FUNCTIONAL BLOCK DIAGRAM GND I2C INTERFACE AND CONTROL LOGIC A W B WIPER REGISTER FUSE LINK VDD A0 SDA SCL AD5273 In addition, for applications that program AD5273 at the factory, Analog Devices offers device programming software 2 running in Windows ® NT, 2000, and XP operating systems. This software application effectively replaces any external I 2C controllers, which in turn enhances users’ systems time-to-market. AD5273 is available in 1 k , 10 k , 50 k , and 100 k in compact SOT23 8-lead standard package and operates from –40°C to +105°C. Besides its unique OTP feature, the AD5273 lends itself well to general digital potentiometer applications due to its effective resolution, array resistance options, small footprint, and low cost. An AD5273 evaluation kit and software are available.The kit includes the connector and cable that can be converted for further factory programming applications. For applications that require dynamic adjustment of resistance settings with nonvolatile EEMEM, users should refer to AD523x and AD525x families of nonvolatile memory digital potentiometers. NOTES 1 One-Time-Programmable—Unlimited adjustments before permanent setting. 2 ADI cannot guarantee the software to be 100% compatible in all systems due to the wide variations in computer configurations. 3 Applies to 1 k parts only. 4 The terms digital potentiometer, VR, and RDAC are used interchangeably. FEATURES 64 Positions OTP (One-Time-Programmable)1 Set-and-Forget Resistance Setting 1 k , 10 k , 50 k , 100 k End-to-End Terminal Resistance Compact Standard SOT23-8 Package Ultralow Power: IDD = 5 A Max Fast Settling Time: tS = 5 s Typ in Power-Up I2C Compatible Digital Interface Computer Software2 Replaces C in Factory Programming Applications Wide Temperature Range: –40 C to +105 C 5 V Programming Voltage Low Operating Voltage, 2.7 V to 5.5 V OTP Validation Check Function APPLICATIONS Systems Calibrations Electronics Level Settings Mechanical Trimmers® Replacement in New Designs Automotive Electronics Adjustments Transducer Circuits Adjustments Programmable Filters up to 6 MHz BW3 REV. 0 |
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