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X9315WZ

Digitally Controlled Potentiometer (XDCP™)

Intersil 

X9315

Basic Configurations of Electronic Potentiometers

VR

VH

VW/RW

VL

Three terminal potentiometer;

variable voltage divider

Basic Circuits

VR

I

Two terminal variable resistor;

variable current

Buffered Reference Voltage

R1

+V

+5V

VREF

VW

+ OP-07

–

VOUT

-5V

VOUT = VW/RW

Cascading Techniques

+V

+V

X

RW/VW

+V

RW/VW

(a)

(b)

Noninverting Amplifier

+5V

VS

+ LM308A

–

VO

-5V

R2

R1

VO = (1 + R2/R1)VS

Voltage Regulator

VIN

317

VO (REG)

R1

Iadj

R2

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

Comparator with Hysteresis

VS LT311A –

+

VO

R1 R2

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

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

(for additional circuits see AN115)

12

FN8179.2

December 21, 2009

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