AD5220BRMZ100-R7

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1. DESCRIPTION

The AD5220BRMZ100-R7 provides a single channel, 128-position digitallycontrolled variable resistor (VR) device. This device performsthe same electronic adjustment function as a potentiometer orvariable resistor. These products were optimized for instrumentand test equipment push-button applications. A choice betweenbandwidth or power dissipation are available as a result of thewide selection of end-to-end terminal resistance values.The AD5220BRMZ100-R7 contains a fixed resistor with a wiper contact thattaps the fixed resistor value at a point determined by a digitallycontrolled UP/DOWN counter.The resistance between thewiper and either end point of the fixed resistor provides a con-stant resistance step size that is equal to the end-to-end resis-tance divided by the number of positions (e.g, RsTEP = 10 k/128 = 78 Q).The variable resistor offers a true adjustable valueof resistance, between the A terminal and the wiper, or the Bterminal and the wiper. The fixed A-to-B terminal resistance of10 k12, 50 k2, or 100 k has a nominal temperature coefficientof 800 ppm“C. The chip select CS, count CLK and U/D direction controlinputs set the variable resistor position, These inputs that con-trol the internal UP/DOWN counter can be easily generatedwith mechanical or push button switches (or other contact closuredevices) External debounce circuitry is required for the nega-tive-edge sensitive CLK pin. This simple digital interface eliminates the need for microcontrollers in front panel interface designs.The AD5220BRMZ100-R7 is available in both surface mount (SO-8) and the8-lead plastic DIP packagc. For ultracompact solutions selectedmodels are available in the thin SOIC package. All parts areguaranteed to operate over the extended industrial temperaturerange of-40°C to +85°C.

2. FEATURES

    1. 128 Position

    2. Potentiometer Replacement

    3. 10 kΩ, 50 kΩ,100 kΩ

    4. Very Low Power: 40 pA Max

    5. Increment/Decrement Count Control

    6. Qualified for automotive applications

3. APPLICATIONS

    1. Mechanical Potentiometer Replacement

    2. Remote Incremental Adjustment Applications

    3. Instrumentation: Gain, Offset Adjustment

    4. Programmable Voltage-to-Current Conversion

    5. Programmable Filters, Delays, Time Constants

    6. Line Impedance Matching

    7. Power Supply Adjustment