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AD5171 数据表(PDF) 1 Page - Analog Devices |
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AD5171 数据表(HTML) 1 Page - Analog Devices |
1 / 24 page 64-Position OTP Digital Potentiometer AD5171 Rev. D Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2004–2008 Analog Devices, Inc. All rights reserved. FEATURES 64 position One-time programmable (OTP) set-and-forget resistance setting—low cost alternative over EEMEM Unlimited adjustments prior to OTP activation 5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ end-to-end resistance Low temperature coefficient: 5 ppm/°C in potentiometer mode Low temperature coefficient: 35 ppm/°C in rheostat mode Compact standard 8-lead SOT-23 package Low power: IDD = 10 μA maximum Fast settling time: tS = 5 μs typical in power-up I2C-compatible digital interface Computer software replaces microcontroller in factory programming applications Full read/write of wiper register Extra I2C device address pin Low operating voltage: 2.7 V to 5.5 V OTP validation check function Automotive temperature range: −40°C to +125°C APPLICATIONS System calibrations Electronics level settings Mechanical trimmers and potentiometer replacements Automotive electronics adjustments Gain control and offset adjustments Transducer circuit adjustments Programmable filters up to 1.5 MHz BW1 GENERAL DESCRIPTION The AD5171 is a 64-position, one-time programmable (OTP) digital potentiometer2 that uses fuse link technology to achieve the memory retention of the resistance setting function. OTP is a cost-effective alternative over the EEMEM approach for users who do not need to reprogram new memory settings in the digital potentiometer. This device performs the same electronic adjustment function as most mechanical trimmers and variable resistors. The AD5171 is programmed using a 2-wire, I2C®- compatible digital control. It allows unlimited adjustments before permanently setting the resistance value. During the OTP activation, a permanent fuse blown command is sent after the final value is determined, freezing the wiper position at a given setting (analogous to placing epoxy on a mechanical trimmer). FUNCTIONAL BLOCK DIAGRAM GND A W B VDD AD0 SDA SCL AD5171 WIPER REGISTER I2C INTERFACE AND CONTROL LOGIC FUSE LINK Figure 1. W 1 VDD 2 GND 3 SCL 4 A 8 B 7 AD0 6 SDA 5 AD5171 TOP VIEW (Not to Scale) Figure 2. Pin Configuration When this permanent setting is achieved, the value does not change regardless of supply variations or environmental stresses under normal operating conditions. To verify the success of permanent programming, Analog Devices, Inc., patterned the OTP validation such that the fuse status can be discerned from two validation bits in read mode. For applications that program the AD5171 in factories, Analog Devices offers device programming software that operates across Windows® 95 to XP platforms, including Windows NT. This software application effectively replaces the need for external I2C controllers or host processors and, therefore, significantly reduces the development time of the users. An AD5171 evaluation kit includes the software, connector, and cable that can be converted for factory programming applications. The AD5171 is available in a compact 8-lead SOT-23 package. All parts are guaranteed to operate over the automotive temper- ature range of −40°C to +125°C. Besides its unique OTP feature, the AD5171 lends itself well to other general-purpose digital potentiometer applications due to its temperature performance, small form factor, and low cost. 1 Applies to 5 kΩ parts only. 2 The terms digital potentiometer and RDAC are used interchangeably. |
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类似说明 - AD5171 |
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