Single-Channel, 1024-Position, Digital Rheostat 2 with I C Interface and 50-TP Memory AD5175 FEATURES FUNCTIONAL BLOCK DIAGRAM V DD Single-channel, 1024-position resolution 10 k nominal resistance 50-times programmable (50-TP) wiper memory POWER-ON RESET Rheostat mode temperature coefficient: 35 ppm/C AD5175 2.7 V to 5.5 V single-supply operation 2.5 V to 2.75 V dual-supply operation for ac or bipolar RDAC operations SCL REGISTER A 2 2 I C 10 I C-compatible interface SERIAL SDA Wiper setting and memory readback INTERFACE W Power on refreshed from memory 50-TP ADDR MEMORY Resistor tolerance stored in memory BLOCK RESET 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 V EXT CAP GND SS APPLICATIONS Figure 1. 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 GENERAL DESCRIPTION The AD5175 is a single-channel, 1024-position digital rheostat voltage supply to facilitate fuse blow and there are 50 oppor- that combines industry leading variable resistor performance tunities for permanent programming. During 50-TP activation, with nonvolatile memory (NVM) in a compact package. a permanent blow fuse command freezes the resistance position (analogous to placing epoxy on a mechanical rheostat). 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 The AD5175 is available in a 3 mm 3mm 10-lead LFCSP 50-times programmable (50-TP) memory. package and in a 10-lead MSOP package. The part is guaranteed to operate over the extended industrial temperature range of The AD5175 device wiper settings are controllable through the 2 40C to +125C. I Ccompatible digital interface. Unlimited adjustments are allowed before programming the resistance value into the 50-TP memory. The AD5175 does not require any external Rev. A 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 08719-001AD5175 TABLE OF CONTENTS Features .............................................................................................. 1 Shift Register ............................................................................... 12 Applications ....................................................................................... 1 Write Operation.......................................................................... 13 Functional Block Diagram .............................................................. 1 Read Operation........................................................................... 15 General Description ......................................................................... 1 RDAC Register ............................................................................ 16 Revision History ............................................................................... 2 50-TP Memory Block ................................................................ 16 Specif icat ions ..................................................................................... 3 Write Protection ......................................................................... 16 Electrical Characteristics ............................................................. 3 50-TP Memory Write-Acknowledge Polling .......................... 18 Interface Timing Specifications .................................................. 4 Reset ............................................................................................. 18 Absolute Maximum Ratings ............................................................ 6 Shutdown Mode ......................................................................... 18 Thermal Resistance ...................................................................... 6 RDAC Architecture .................................................................... 18 ESD Caution .................................................................................. 6 Programming the Variable Resistor ......................................... 18 Pin Configuration and Function Descriptions ............................. 7 EXT CAP Capacitor .................................................................. 19 Typical Performance Characteristics ............................................. 8 Terminal Voltage Operating Range ......................................... 19 Test Circuits ..................................................................................... 11 Power-Up Sequence ................................................................... 19 Theory of Operation ...................................................................... 12 Outline Dimensions ....................................................................... 20 Serial Data Interface ................................................................... 12 Ordering Guide .......................................................................... 20 REVISION HISTORY 7/10Rev. 0 to Rev. A Changes to Ordering Guide .......................................................... 20 3/10Revision 0: Initial Version Rev. A Page 2 of 20