2 I C-Compatible, 256-Position Digital Potentiometers Data Sheet AD5241/AD5242 FEATURES FUNCTIONAL BLOCK DIAGRAM A W B O O 1 1 1 1 2 256 positions 10 k , 100 k , 1 M SHDN Low temperature coefficient: 30 ppm/C Internal power on midscale preset V DD RDAC Single-supply 2.7 V to 5.5 V or dual-supply 2.7 V for ac or REGISTER 2 REGISTER 1 V bipolar operation SS 2 I C-compatible interface with readback capability ADDR Extra programmable logic outputs DECODE 8 AD5241 Self-contained shutdown feature Extended temperature range: 40C to +105C SDA PWR-ON SERIAL INPUT REGISTER RESET SCL GND APPLICATIONS AD1 AD0 Multimedia, video, and audio Figure 1. AD5241 Functional Block Diagram Communications Mechanical potentiometer replacement A W B A W B O O 1 1 1 2 2 2 1 2 Instrumentation: gain, offset adjustment Programmable voltage-to-current conversion SHDN REGISTER Line impedance matching V DD RDAC RDAC REGISTER 1 REGISTER 2 V SS ADDR DECODE AD5242 8 1 SDA PWR-ON SERIAL INPUT REGISTER RESET SCL GND AD0 AD1 Figure 2. AD5242 Functional Block Diagram GENERAL DESCRIPTION The AD5241/AD5242 provide a single-/dual-channel, 256- Wiper position programming defaults to midscale at system position, digitally controlled variable resistor (VR) device. These power on. When powered, the VR wiper position is programmed 2 devices perform the same electronic adjustment function as a by an I C-compatible, 2-wire serial data interface. Both parts potentiometer, trimmer, or variable resistor. Each VR offers a have two extra programmable logic outputs available that completely programmable value of resistance between the A enable users to drive digital loads, logic gates, LED drivers, and terminal and the wiper, or the B terminal and the wiper. For the analog switches in their system. AD5242, the fixed A-to-B terminal resistance of 10 k , 100 k , The AD5241/AD5242 are available in surface-mount, 14-lead or 1 M has a 1% channel -to-channel matching tolerance. The SOIC and 16-lead SOIC packages and, for ultracompact solutions, nominal temperature coefficient of both parts is 30 ppm/C. 14-lead TSSOP and 16-lead TSSOP packages. All parts are guaranteed to operate over the extended temperature range of 40C to +105C. Rev. D 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. 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Technical Support www.analog.com 00926-001 00926-002AD5241/AD5242 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Test Circuits ..................................................................................... 11 Applications ....................................................................................... 1 Theory of Operation ...................................................................... 12 Functional Block Diagram .............................................................. 1 Programming the Variable Resistor ......................................... 12 General Description ......................................................................... 1 Programming the Potentiometer Divider ............................... 13 Revision History ............................................................................... 2 Digital Interface .......................................................................... 13 Specifications ..................................................................................... 3 Readback RDAC Value .............................................................. 14 10 k, 100 k, 1 M Version .................................................... 3 Multiple Devices on One Bus ................................................... 14 Timing Diagrams .......................................................................... 5 Level-Shift for Bidirectional Interface ..................................... 14 Absolute Maximum Ratings ............................................................ 6 Additional Programmable Logic Output ................................ 15 ESD Caution .................................................................................. 6 Shutdown Function .................................................................... 15 Pin Configurations and Function Descriptions ........................... 7 Outline Dimensions ....................................................................... 16 Typical Performance Characteristics ............................................. 8 Ordering Guide .......................................................................... 18 REVISION HISTORY 6/15Rev. C to Rev. D 2/02Rev. 0 to Rev. A Changes to Ordering Guide .......................................................... 18 Edits to Features.................................................................................1 Edits to Functional Block Diagrams ............................................... 1 12/09Rev. B to Rev. C Edits to Absolute Maximum Ratings .............................................. 4 Changes to Features Section............................................................ 1 Changes to Ordering Guide ............................................................. 4 Changes to 10 k, 100 k, 1 M Version Section ...................... 3 Edits to Pin Function Descriptions ................................................. 5 Changes to Table 3 ............................................................................ 6 Edits to Figures 1, 2, 3 ....................................................................... 6 Deleted Digital Potentiometer Selection Guide Section ........... 14 Added Readback RDAC Value Section, Additional Changed Self-Contained Shutdown Function Section to Programmable Logic Output Section, and Figure 7 Shutdown Function Section .......................................................... 15 Renumbered Sequentially ............................................................. 11 Changes to Shutdown Function Section ..................................... 15 Changes to Digital Potentiometer Selection Guide ................... 14 Changes to Ordering Guide .......................................................... 18 8/02Rev. A to Rev. B Additions to Features ....................................................................... 1 Changes to General Description .................................................... 1 Changes to Specifications ................................................................ 2 Changes to Absolute Maximum Ratings ....................................... 4 Additions to Ordering Guide .......................................................... 4 Changes to TPC 8 and TPC 9 ......................................................... 8 Changes to Readback RDAC Value Section ................................ 11 Changes to Additional Programmable Logic Output Section .. 11 Added Self-Contained Shutdown Section ................................... 12 Added Figure 8 ................................................................................ 12 Changes to Digital Potentiometer Selection Guide ................... 14 Rev. D Page 2 of 18