CAT5124 查看數據表（PDF） - ON Semiconductor

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CAT5124

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

ON Semiconductor 

CAT5110, CAT5118, CAT5119, CAT5123, CAT5124, CAT5125

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

An op amp can be used to provide buffering and gain

on the output of the CAT5110/CAT5125. This can be

done by connecting the wiper output to the positive

input of a noninverting op amp as shown in Figure 3.

Figure 4 shows a similar circuit for the CAT5119/

CAT5124.

Adjustable Gain

Figure 5 shows how to use either a variable resistor or

a potentiometer to digitally adjust the gain of a

noninverting op amp configuration, by connecting the

Minipot in series with a resistor to ground. The

MiniPots have a low 5ppm/ºC ratiometric tempco that

allows for a very stable adjustable gain configuration

over temperature.

+5V

H

W

CAT5110/CAT5125 L

30V

VOUT

+5V

H

CAT5119/CAT5124 L

30V

VOUT

Figure 3. Positive LCD Bias Control

VCC

VIN

VOUT

H

CAT5118/CAT5123 L

Figure 5a. Adjustable Gain Circuit

Figure 4. Positive LCD Bias Control

VCC

VIN

VOUT

W

L

H

CAT5110/CAT5125

Figure 5b. Adjustable Gain Circuit

Doc. No. MD-2120 Rev. K

6

© 2008 SCILLC. All rights reserved.

Characteristics subject to change without notice

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