CAT5110TPI-00-T datasheet(8/11 Pages) CATALYST

Part #	CAT5110TPI-00-T

Description	32-Tap MiniPot Digitally Programmable Potentiometers with 2-Wire Interface

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Manufacturer	CATALYST [Catalyst Semiconductor]

Direct Link	http://www.catalyst-semiconductor.com

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8 / 11 page

CAT5110/5118/5119

8

Doc. No. 2120, Rev. A

APPLICATIONS INFORMATION

The Minipots are intended for circuits requiring digitally

controlled adjustable resistance, such as LCD contrast

control, where voltage biasing adjusts the display con-

trast.

Alternative Positive LCD Bias Control

Use an op amp to provide buffering and gain on the

output of the CAT5110. 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 CAT5119.

Adjustable Gain

Figure 5 shows how to use the variable resistor to

digitally adjust the gain of a noninverting op amp

configuration. Connect the CAT5119 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

CAT5110

CAT5119

CAT5110

Figure 3. Positive LCD Bias Control

Figure 4. Positive LCD Bias Control

Figure 5a. Adjustable Gain Circuit

Figure 5b. Adjustable Gain Circuit

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CAT5110TPI-00-T Datasheet(PDF) 8 Page - Catalyst Semiconductor

CAT5110TPI-00-T Datasheet(HTML) 8 Page - Catalyst Semiconductor

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