/ 2 Dual, 256-Position, I C-Compatible Digital Potentiometers Data Sheet AD5243/AD5248 FEATURES FUNCTIONAL BLOCK DIAGRAMS A1 W1 B1 A2 W2 B2 2-channel, 256-position potentiometers 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 V DD Full read/write of wiper register WIPER WIPER Power-on preset to midscale REGISTER 1 REGISTER 2 Extra package address decode pins: AD0 and AD1 (AD5248 only) GND Computer software replaces microcontroller in factory programming applications AD5243 Single supply: 2.7 V to 5.5 V SDA PC INTERFACE Low temperature coefficient: 35 ppm/C SCL Low power: I = 6 A maximum DD Figure 1. AD5243 Wide operating temperature: 40C to +125C W1 B1 W2 B2 Evaluation board available APPLICATIONS Systems calibrations V DD Electronics level settings RDAC RDAC REGISTER 1 REGISTER 2 Mechanical trimmers replacement in new designs GND Permanent factory printed circuit board (PCB) setting Transducer adjustment of pressure, temperature, position, AD0 ADDRESS chemical, and optical sensors DECODE AD1 AD5248 8 RF amplifier biasing SDA SERIAL INPUT Gain control and offset adjustment REGISTER SCL Figure 2. AD5248 GENERAL DESCRIPTION The AD5243 and AD5248 provide a compact 3 mm 4.9 mm into the RDAC latch. (The terms digital potentiometer, VR, packaged solution for dual, 256-position adjustment applications. and RDAC are used interchangeably.) The AD5243 performs the same electronic adjustment function Operating from a 2.7 V to 5.5 V power supply and consuming as a 3-terminal mechanical potentiometer, and the AD5248 less than 6 A allows the AD5243/AD5248 to be used in performs the same adjustment function as a 2-terminal variable portable battery-operated applications. resistor. Available in four end-to-end resistance values (2.5 k, For applications that program the AD5243/AD5248 at the 10 k, 50 k , and 100 k), these low temperature coefficient factory, Analog Devices, Inc., offers device programming devices are ideal for high accuracy and stability-variable software running on Windows NT/2000/XP operating systems. resistance adjustments. The wiper settings are controllable 2 This software effectively replaces the need for external I C 2 through the I C-compatible digital interface. The AD5248 has controllers, which in turn enhances the time to market of extra package address decode pins, AD0 and AD1, allowing 2 systems. An AD5243/AD5248 evaluation kit and software are multiple parts to share the same I C, 2-wire bus on a PCB. The available. The kit includes a cable and instruction manual. resistance between the wiper and either endpoint of the fixed resistor varies linearly with respect to the digital code transferred Rev. C Document Feedback 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 20042016 Analog Devices, Inc. All rights reserved. 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. Technical Support www.analog.com 04109-0-002 04109-0-001AD5243/AD5248 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Test Circuits ..................................................................................... 12 Applications ....................................................................................... 1 Theory of Operation ...................................................................... 13 Functional Block Diagrams ............................................................. 1 Programming the Variable Resistor and Voltage ................... 13 General Description ......................................................................... 1 Programming the Potentiometer Divider ............................... 14 Revision History ............................................................................... 2 ESD Protection ........................................................................... 14 Specifications ..................................................................................... 3 Terminal Voltage Operating Range ......................................... 14 Electrical Characteristics: 2.5 k Version ................................. 3 Power-Up Sequence ................................................................... 14 Electrical Characteristics: 10 k , 50 k , and 100 k Layout and Power Supply Bypassing ....................................... 14 Versions .......................................................................................... 4 Constant Bias to Retain Resistance Setting ............................. 15 Timing Characteristics: All Versions ......................................... 5 2 I C Interface .................................................................................... 16 Absolute Maximum Ratings ............................................................ 6 2 I C Compatible, 2-Wire Serial Bus .......................................... 16 ESD Caution .................................................................................. 6 2 I C Controller Programming .................................................... 18 Pin Configurations and Function Descriptions ........................... 7 Outline Dimensions ....................................................................... 19 Typical Performance Characteristics ............................................. 8 Ordering Guide .......................................................................... 19 REVISION HISTORY 4/16Rev. B to Rev. C Changes to Applications Section and General Description 4/09Rev. 0 to Rev. A Section ................................................................................................ 1 Changes to DC CharacteristicsRheostat Mode Parameter and Changed Digital Inputs and Outputs Parameter to Digital to DC CharacteristicsPotentiometer Divider Mode Parameter, Inputs Parameter, Table 1 ................................................................ 3 Table 1 .................................................................................................3 Changed Digital Inputs and Outputs Parameter to Digital Moved Figure 3 ..................................................................................5 Inputs Parameter, Table 2 ................................................................ 4 Updated Outline Dimensions ....................................................... 19 Changes to Ordering Guide .......................................................... 19 Changes to Ordering Guide .......................................................... 19 4/12Rev. A to Rev. B 1/04Revision 0: Initial Version Changes to Rheostat Operation Section, Table 7, and Table 8 .............................................................................................. 13 Changes to Voltage Output Operation Section .......................... 14 Deleted Evaluation Board Section and Figure 45, Renumbered Sequentially ..................................................................................... 15 Changes to Table 13 ........................................................................ 17 Updated Outline Dimensions ....................................................... 19 Changes to Ordering Guide .......................................................... 19 Rev. C Page 2 of 20