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AD5173BRMZ102 Folha de dados(PDF) 1 Page - Analog Devices |
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AD5173BRMZ102 Folha de dados(HTML) 1 Page - Analog Devices |
1 / 24 page 256-Position, One-Time Programmable, Dual-Channel, I2C Digital Potentiometers AD5172/AD5173 Rev. H 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 ©2003–2009 Analog Devices, Inc. All rights reserved. FEATURES 2-channel, 256-position potentiometers One-time programmable (OTP) set-and-forget resistance setting provides a low cost alternative to EEMEM Unlimited adjustments prior to OTP activation OTP overwrite allows dynamic adjustments with user- defined preset End-to-end resistance: 2.5 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ Compact 10-lead MSOP: 3 mm × 4.9 mm Fast settling time: tS = 5 μs typical on power-up Full read/write of wiper register Power-on preset to midscale Extra package address decode pins: AD0 and AD1 (AD5173) Single supply: 2.7 V to 5.5 V Low temperature coefficient: 35 ppm/°C Low power: IDD = 6 μA maximum Wide operating temperature: −40°C to +125°C APPLICATIONS Systems calibration Electronics level setting Mechanical trimmers replacement in new designs Permanent factory PCB setting Transducer adjustment of pressure, temperature, position, chemical, and optical sensors RF amplifier biasing Automotive electronics adjustment Gain control and offset adjustment FUNCTIONAL BLOCK DIAGRAMS A1 VDD GND SDA SCL W1 RDAC REGISTER 1 SERIAL INPUT REGISTER B1 A2 W2 RDAC REGISTER 2 B2 FUSE LINKS 12 / 8 Figure 1. AD5172 Functional Block Diagram VDD GND SDA SCL AD0 AD1 W1 RDAC REGISTER 1 ADDRESS DECODE SERIAL INPUT REGISTER B1 W2 RDAC REGISTER 2 B2 FUSE LINKS 12 /8 Figure 2. AD5173 Functional Block Diagram GENERAL DESCRIPTION The AD5172/AD5173 are dual-channel, 256-position, one-time programmable (OTP) digital potentiometers1 that employ fuse link technology to achieve memory retention of resistance settings. OTP is a cost-effective alternative to EEMEM for users who do not need to program the digital potentiometer setting in memory more than once. These devices perform the same electronic adjustment function as mechanical potentiometers or variable resistors but with enhanced resolution, solid-state reliabil- ity, and superior low temperature coefficient performance. The AD5172/AD5173 are programmed using a 2-wire, I2C®- compatible digital interface. Unlimited adjustments are allowed before permanently setting the resistance value. During OTP activation, a permanent blow fuse command freezes the wiper position (analogous to placing epoxy on a mechanical trimmer). Unlike traditional OTP digital potentiometers, the AD5172/ AD5173 have a unique temporary OTP overwrite feature that allows for new adjustments even after a fuse is blown. However, the OTP setting is restored during subsequent power-up condi- tions. This allows users to treat these digital potentiometers as volatile potentiometers with a programmable preset. 1 The terms digital potentiometer, VR, and RDAC are used interchangeably. |
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