X9420

Characteristics subject to change without notice.

16 of 20

REV 1.1.6 7/30/02

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APPLICATIONS INFORMATION

Electronic potentiometers provide three powerful application advantages: (1) the variability and reliability of a solid-

state potentiometer, (2) the flexibility of computer-based digital controls, and (3) the retentivity of nonvolatile

memory used for the storage of multiple potentiometer settings or data.

Basic Configurations of Electronic Potentiometers

Basic Circuits

I

Three terminal Potentiometer;

Variable voltage divider

Two terminal Variable Resistor;

Variable current

Noninverting Amplifier

Voltage Regulator

Offset Voltage Adjustment

Comparator with Hysterisis

+

–

317

+

–

100K

Ω

10K

Ω

10K

Ω

10K

Ω

-12V

+12V

TL072

+

–

+5V

–5V

LM308A

Cascading Techniques

Buffered Reference Voltage

–

+

+5V

+V

–5V

OP-07

+V

+V

+V

X

(a)

(b)