Dual, 256-Position, SPI Digital Potentiometer AD5162 FEATURES FUNCTIONAL BLOCK DIAGRAM A1 W1 B1 W2 B2 2-channel, 256-position potentiometer End-to-end resistance: 2.5 k , 10 k , 50 k , and 100 k Compact 10-lead MSOP (3 mm 4.9 mm) package Fast settling time: t = 5 s typical on power-up S Full read/write of wiper register V DD Power-on preset to midscale Computer software replaces microcontroller in factory WIPER WIPER REGISTER 1 REGISTER 2 programming applications GND Single supply: 2.7 V to 5.5 V A = 0 A = 1 Low temperature coefficient: 35 ppm/C AD5162 Low power: I = 6 A maximum DD CLK Wide operating temperature: 40C to +125C SDI SPI INTERFACE Evaluation board available CS Qualified for automotive applications Figure 1. APPLICATIONS Systems calibrations Electronics level settings 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 GENERAL DESCRIPTION The AD5162 provides a compact 3 mm 4.9 mm packaged Operating from a 2.7 V to 5.5 V power supply and consuming solution for dual, 256-position adjustment applications. This less than 6 A allows the AD5162 to be used in portable battery- device performs the same electronic adjustment function as a operated applications. 3-terminal mechanical potentiometer. Available in four end-to- For applications that program the AD5162 at the factory, end resistance values (2.5 k, 10 k, 50 k, 100 k), this low Analog Devices offers device programming software running temperature coefficient device is ideal for high accuracy and on Windows NT/2000/XP operating systems. This software stability-variable resistance adjustments. The wiper settings are effectively replaces the need for external SPI controllers, which controllable through an SPI digital interface. The resistance in turn enhances the time to market of systems. An AD5162 between the wiper and either endpoint of the fixed resistor evaluation kit and software are available. The kit includes a varies linearly with respect to the digital code transferred into cable and instruction manual. 1 the RDAC latch. 1 The terms digital potentiometer, VR, and RDAC are used interchangeably. Rev. C 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. 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All rights reserved. 04108-0-001AD5162 TABLE OF CONTENTS Theory of Operation ...................................................................... 13 Features .............................................................................................. 1 Programming the Variable Resistor and Voltage ................... 13 Applications ....................................................................................... 1 Programming the Potentiometer Divider ............................... 14 Functional Block Diagram .............................................................. 1 ESD Protection ........................................................................... 14 General Description ......................................................................... 1 Terminal Voltage Operating Range ......................................... 14 Revision History ............................................................................... 2 Power-Up Sequence ................................................................... 14 Specifications ..................................................................................... 3 Layout and Power Supply Bypassing ....................................... 15 Electrical Characteristics: 2.5 k Version ................................. 3 Constant Bias to Retain Resistance Setting ............................. 15 Electrical Characteristics: 10 k , 50 k , and 100 k Versions ......................................................................................................... 4 Evaluation Board ........................................................................ 15 Timing Characteristics: All Versions ......................................... 5 SPI Interface .................................................................................... 16 Absolute Maximum Ratings ............................................................ 6 SPI-Compatible, 3-Wire Serial Bus .......................................... 16 ESD Caution .................................................................................. 6 Outline Dimensions ....................................................................... 17 Pin Configuration and Function Descriptions ............................. 7 Ordering Guide .......................................................................... 17 Typical Performance Characteristics ............................................. 8 Automotive Products ................................................................. 17 Test Circuits ..................................................................................... 12 REVISION HISTORY 12/10Rev. B to Rev.C Added Automotive Parts to Features Section ............................... 1 Added Automotive Products Paragraph...................................... 17 4/09Rev. A to Rev. B Changes to Features Section............................................................ 1 Changes to DC CharacteristicsRheostat Mode Parameter and to DC CharacteristicsPotentiometer Divider Mode Parameter, Table 1 ................................................................................................ 3 Updated Outline Dimensions ....................................................... 17 Changes to Ordering Guide .......................................................... 17 11/03Rev. 0 to Rev. A Changes to Electrical Characteristics ............................................ 3 11/03Revision 0: Initial Version Rev. C Page 2 of 20