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AD5220BR100 датащи(PDF) 1 Page - Analog Devices |
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AD5220BR100 датащи(HTML) 1 Page - Analog Devices |
1 / 10 page REV. 0 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 rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD5220 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1998 Increment/Decrement Digital Potentiometer FUNCTIONAL BLOCK DIAGRAM UP/ DOWN CNTR RS D E C O D E 7 40H POR EN AD5220 VDD A W B GND CLK CS U/ D FEATURES 128 Position Potentiometer Replacement 10 k , 50 k , 100 k Very Low Power: 40 A Max Increment/Decrement Count Control APPLICATIONS Mechanical Potentiometer Replacement Remote Incremental Adjustment Applications Instrumentation: Gain, Offset Adjustment Programmable Voltage-to-Current Conversion Programmable Filters, Delays, Time Constants Line Impedance Matching Power Supply Adjustment GENERAL DESCRIPTION The AD5220 provides a single channel, 128-position digitally controlled variable resistor (VR) device. This device performs the same electronic adjustment function as a potentiometer or variable resistor. These products were optimized for instrument and test equipment push-button applications. A choice between bandwidth or power dissipation are available as a result of the wide selection of end-to-end terminal resistance values. The AD5220 contains a fixed resistor with a wiper contact that taps the fixed resistor value at a point determined by a digitally controlled UP/DOWN counter. The resistance between the wiper 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 kΩ/ 128 = 78 Ω). The variable resistor offers a true adjustable value of resistance, between the A terminal and the wiper, or the B terminal and the wiper. The fixed A-to-B terminal resistance of 10 k Ω, 50 kΩ, or 100 kΩ has a nominal temperature coefficient of 800 ppm/ °C. The chip select CS, count CLK and U/D direction control inputs set the variable resistor position. These inputs that con- trol the internal UP/DOWN counter can be easily generated with mechanical or push button switches (or other contact closure devices). External debounce circuitry is required for the nega- tive-edge sensitive CLK pin. This simple digital interface elimi- nates the need for microcontrollers in front panel interface designs. The AD5220 is available in both surface mount (SO-8) and the 8-lead plastic DIP package. For ultracompact solutions selected models are available in the thin µSOIC package. All parts are guaranteed to operate over the extended industrial temperature range of –40 °C to +85°C. For 3-wire, SPI compatible inter- face applications, see the AD7376/AD8400/AD8402/AD8403 products. UPCOUNT DETAIL VDD = 5.5V VA = 5.5V VB = 0V f = 100kHz CLK VWB 50mV/DIV 5V/DIV Figure 2a. Stair-Step Increment Output VDD = 5.5V VA = 5.5V VB = 0V f = 60kHz COUNT 00H v 3FH v 00H VWR fCLK = 60kHz Figure 2b. Full-Scale Up/Down Count AD5220 CS U/ D CLK +5V UP/DOWN INCREMENT Figure 1. Typical Push-Button Control Application |
Аналогичный номер детали - AD5220BR100 |
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Аналогичное описание - AD5220BR100 |
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