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CAT5120SBI-50-T Datasheet(PDF) 8 Page - Catalyst Semiconductor

No. de pieza CAT5120SBI-50-T
Descripción Electrónicos  16-Tap MiniPot Digitally Programmable Potentiometers with 2-Wire Interface
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Fabricante Electrónico  CATALYST [Catalyst Semiconductor]
Página de inicio  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT5120SBI-50-T Datasheet(HTML) 8 Page - Catalyst Semiconductor

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CAT5120/5121/5122
8
Doc. No. 2121, 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 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 4. Positive LCD Bias Control
Figure 5a. Adjustable Gain Circuit
Figure 5b. Adjustable Gain Circuit
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


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