AD5174: Single-Channel, 1024-Position, Digital Rheostat with SPI interface and 50-TP Memory - Analog Devices - #1

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Single-Channel, 1024-Position, Digital Rheostat with SPI Interface and 50-TP Memory AD5174 Rev. B 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. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. 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 ©2010 Analog Devices, Inc. All rights reserved. FEATURES Single-channel, 1024-position resolution 10 kÙ nominal resistance 50-times programmable (50-TP) wiper memory Rheostat mode temperature coefficient: 35 ppm/°C 2.7 V to 5.5 V single-supply operation ±2.5 V to ±2.75 V dual-supply operation for ac or bipolar operations SPI-compatible interface Wiper setting and memory readback Power on refreshed from memory Resistor tolerance stored in memory Thin LFCSP 10-lead, 3 mm × 3 mm× 0.8 mm package Compact MSOP, 10-lead, 3 mm × 4.9 mm × 1.1 mm package APPLICATIONS Mechanical rheostat replacements Op-amp: variable gain control Instrumentation: gain, offset adjustment Programmable voltage-to-current conversions Programmable filters, delays, time constants Programmable power supply Sensor calibration FUNCTIONAL BLOCK DIAGRAM 10VDDVSSEXT_CAPGNDAWAD5174SCLKDINSDOSPISERIALINTERFACEPOWER-ONRESETRDACREGISTER50-TPMEMORYBLOCKSYNC08718-001 Figure 1. GENERAL DESCRIPTION The AD5174 is a single-channel, 1024-position digital rheostat that combines industry leading variable resistor performance with nonvolatile memory (NVM) in a compact package. This device supports both dual-supply operation at ±2.5 V to ±2.75 V and single-supply operation at 2.7 V to 5.5 V and offers 50-times programmable (50-TP) memory. The AD5174 device wiper settings are controllable through the SPI digital interface. Unlimited adjustments are allowed before programming the resistance value into the 50-TP memory. The AD5174 does not require any external voltage supply to facili-tate fuse blow and there are 50 opportunities for permanent programming. During 50-TP activation, a permanent blow fuse command freezes the resistance position (analogous to placing epoxy on a mechanical rheostat). The AD5174 is available in a 3 mm × 3mm 10-lead LFCSP package and in a 10-lead MSOP package. The part is guaranteed to operate over the extended industrial temperature range of -40°C to +125°C.