CAT5120TBI-00-GT3 datasheet(5/13 Pages) CATALYST

No. de pieza	CAT5120TBI-00-GT3

Descripción Electrónicos	16-Tap MiniPot TM Digitally Programmable Potentiometers with 2-Wire Interface

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Fabricante Electrónico	CATALYST [Catalyst Semiconductor]

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CAT5120, CAT5121, CAT5122

5

Doc No. 22, Rev. C

Characteristics subject to change without notice

APPlICATIOns InFOrMATIOn

The Minipots are intended for circuits requiring digitally

controlled adjustable resistance, such as LCD contrast

control, where voltage biasing adjusts the display

contrast.

AlTernATIVe POsITIVe lCD bIAs COnTrOl

Use an op amp to provide buffering and gain on the output

of the CAT520. Connect the mechanical potentiometer

to the positive input of a noninverting op amp (Figure 3) to

select a portion of the input signal by digitally controlling

the wiper terminal. Figure 4 shows a similar circuit for

the CAT52.

Figure 3. Positive lCD bias Control

Figure 4. Positive lCD bias Control

ADjusTAble GAIn

Figure 5 shows how to use the variable resistor to digitally

adjust the gain of a noninverting op amp configuration.

Connect the CAT52 in series with a resistor to ground

to form the adjustable gain control of a noninverting

amplifier. The Minipots have a low 5ppm/°C ratiometric

tempco that allows for a very stable adjustable gain

configuration over temperature.

30V

W

L

H

+5V

VOUT

30V

L

H

+5V

VOUT

VCC

L

H

VIN

VOUT

VCC

L

H

W

VIN

VOUT

CAT5120

CAT5121

CAT5120

Figure 5a. Adjustable Gain Circuit

Figure 5b. Adjustable Gain Circuit

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CAT5120TBI-00-GT3 Datasheet(PDF) 5 Page - Catalyst Semiconductor

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