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X9312WSI

Digitally Controlled Potentiometer (XDCP™)

Intersil 

X9312

APPLICATIONS INFORMATION

Electronic digitally controlled (XDCP) 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

VR

VR

VH

VW/RW

VL

Three terminal potentiometer;

variable voltage divider

I

Two terminal variable resistor;

variable current

Basic Circuits

Buffered Reference Voltage

R1

+V

+5V

VREF

VW

+ OP-07

–

VOUT

-5V

VOUT = VW/RW

Cascading Techniques

+V

+V

X

VW/RW

+V

VW/RW

(a)

(b)

Noninverting Amplifier

+5V

VS

+ LM308A

–

VO

–5V

R2

R1

VO = (1+R2/R1)VS

Voltage Regulator

Offset Voltage Adjustment

VIN

317

VO (REG) VS

R1

R2

R1

100kΩ

–

Iadj

R2

10kΩ

+

TL072

VO (REG) = 1.25V (1+R2/R1)+Iadj R2

10kΩ

10kΩ

+12V

-12V

Comparator with Hysteresis

LT311A

VS

–

+

VO

VO

R1 R2

VUL = {R1/(R1+R2)} VO(max)

VLL = {R1/(R1+R2)} VO(min)

(for additional circuits see AN115)

7

FN8176.0

March 15, 2005

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