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AD5241 Fiches technique(PDF) 1 Page - Analog Devices |
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AD5241 Fiches technique(HTML) 1 Page - Analog Devices |
1 / 20 page I2C-Compatible, 256-Position Digital Potentiometers AD5241/AD5242 Rev. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. 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 ©2001–2009 Analog Devices, Inc. All rights reserved. FEATURES 256 positions 10 kΩ, 100 kΩ, 1 MΩ Low temperature coefficient: 30 ppm/°C Internal power on midscale preset Single-supply 2.7 V to 5.5 V or dual-supply ±2.7 V for ac or bipolar operation I2C-compatible interface with readback capability Extra programmable logic outputs Self-contained shutdown feature Extended temperature range: −40°C to +105°C APPLICATIONS Multimedia, video, and audio Communications Mechanical potentiometer replacement Instrumentation: gain, offset adjustment Programmable voltage-to-current conversion Line impedance matching FUNCTIONAL BLOCK DIAGRAM RDAC REGISTER 1 ADDR DECODE 8 PWR-ON RESET SERIAL INPUT REGISTER AD5241 SHDN VDD VSS SDA SCL GND A1 W1 B1 O1 O2 REGISTER 2 AD0 AD1 Figure 1. AD5241 Functional Block Diagram A1 W1 B1 A2 W2 B2 O1 O2 RDAC REGISTER 1 ADDR DECODE 8 PWR-ON RESET SERIAL INPUT REGISTER AD5242 VDD VSS SDA SCL GND RDAC REGISTER 2 REGISTER 1 AD0 AD1 SHDN Figure 2. AD5242 Functional Block Diagram GENERAL DESCRIPTION The AD5241/AD5242 provide a single-/dual-channel, 256- position, digitally controlled variable resistor (VR) device. These devices perform the same electronic adjustment function as a potentiometer, trimmer, or variable resistor. Each VR offers a completely programmable value of resistance between the A terminal and the wiper, or the B terminal and the wiper. For the AD5242, the fixed A-to-B terminal resistance of 10 kΩ, 100 kΩ, or 1 MΩ has a 1% channel-to-channel matching tolerance. The nominal temperature coefficient of both parts is 30 ppm/°C. Wiper position programming defaults to midscale at system power on. When powered, the VR wiper position is programmed by an I2C®-compatible, 2-wire serial data interface. Both parts have two extra programmable logic outputs available that enable users to drive digital loads, logic gates, LED drivers, and analog switches in their system. The AD5241/AD5242 are available in surface-mount, 14-lead SOIC and 16-lead SOIC packages and, for ultracompact solutions, 14-lead TSSOP and 16-lead TSSOP packages. All parts are guaranteed to operate over the extended temperature range of −40°C to +105°C. |
Numéro de pièce similaire - AD5241_15 |
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Description similaire - AD5241_15 |
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