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CAT5121SDI-10GT3 Datasheet(PDF) 5 Page - Catalyst Semiconductor

Part # CAT5121SDI-10GT3
Description  16-Tap MiniPot??Digitally Programmable Potentiometers with 2-Wire Interface
Download  12 Pages
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Manufacturer  CATALYST [Catalyst Semiconductor]
Direct Link  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT5121SDI-10GT3 Datasheet(HTML) 5 Page - Catalyst Semiconductor

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CAT5120, CAT5121, CAT5122
© Catalyst Semiconductor, Inc.
5
Doc. No. MD-2121 Rev. E
Characteristics subject to change without notice
30V
W
L
H
+5V
VOUT
30V
L
H
+5V
VOUT
VCC
L
H
VIN
VOUT
VCC
L
H
W
VIN
VOUT
CAT5120
CAT5121
CAT5121
CAT5120
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 CAT5120. 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 CAT5121.
Adjustable Gain
Figure 5 shows how to use the variable resistor to
digitally adjust the gain of a noninverting op amp
configuration. Connect the CAT5121 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.
Figure 3. Positive LCD Bias Control
Figure 5a. Adjustable Gain Circuit
Figure 5b. Adjustable Gain Circuit
Figure 4. Positive LCD Bias Control


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