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CAT5119 Datasheet(PDF) 6 Page - Catalyst Semiconductor

Part # CAT5119
Description  32-Tap MiniPot TM Digitally Programmable Potentiometers with 2-Wire Interface
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Manufacturer  CATALYST [Catalyst Semiconductor]
Direct Link  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT5119 Datasheet(HTML) 6 Page - Catalyst Semiconductor

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CAT5110, CAT5118, CAT5119, CAT5123, CAT5124, CAT5125
6
Doc. No. 220, Rev. E
© 2007 by Catalyst Semiconductor, Inc.
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
An op amp can be used to provide buffering and gain on
the output of the CAT50/CAT525. 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 CAT59/CAT524.
Figure 3. Positive lCD bias Control
Figure 4. Positive lCD bias Control
ADjusTAble GAIn
Figure 5 shows how to use either a variable resistor or a
potentiometertodigitallyadjustthegainofanoninverting
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.
Figure 5a. Adjustable Gain Circuit
Figure 5b. Adjustable Gain Circuit
30V
W
L
H
+5V
VOUT
CAT5110/CAT5125
30V
L
H
+5V
VOUT
CAT5119/CAT5124
VCC
L
H
VIN
VOUT
VCC
L
H
W
VIN
VOUT
CAT5110/CAT5125
CAT5118/CAT5123


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