X9015TF 데이터 시트보기 (PDF) - Intersil

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X9015TF

Single Digitally Controlled (XDCP™) Potentiometer

Intersil 

X9015

Applications Information

Electronic digitally controlled potentiometers provide two powerful application advantages: (1) the variability and reliability of a

solid-state potentiometer, and (2) the flexibility of computer-based digital controls.

Basic Configurations of Electronic Potentiometers

VR

VR

VH/RH

VW/RW

VL/RL

Three terminal potentiometer;

variable voltage divider

I

Two terminal variable resistor;

variable current

Basic Circuits

Buffered Reference Voltage

R1

+V

+5V

VREF

VW/RW

+

–

OP-07

VOUT

–5V

VOUT = VW

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

R1

Iadj

R2

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

VO (REG)

R1

VS

100kΩ

10kΩ

R2

–

+

TL072

10kΩ

10kΩ

+12V

-12V

Comparator with Hysteresis

VS LT311A –

VO

+

VO

R1 R2

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

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

(for additional circuits see AN115)

9

FN8157.1

September 15, 2005

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