8 of 10

REV 1.7 7/10/03

www.xicor.com

X9319

APPLICATIONS INFORMATION

Electronic digitally controlled (XDCP) potentiometers provide three powerful application advantages; (1) the vari-

ability 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

Cascading Techniques

Buffered Reference Voltage

–

+

+5V

+V

LMC7101

+V

+V

+V

X

(a)

(b)

Single Supply Inverting Amplifier

Voltage Regulator

317

Offset Voltage Adjustment

+

–

100K

Ω

10K

Ω

10K

Ω

10K

Ω

+15V

LMC7101

Comparator with Hysteresis

+

–

LMC7101

+

–

LT311A

(for additional circuits see AN115)

+12V

+8V

100K

100K

+10V