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CAT5122TBI-10GT3 Datasheet(PDF) 6 Page - ON Semiconductor

No. de pieza CAT5122TBI-10GT3
Descripción Electrónicos  16?릘ap Digital Potentiometers (POTs)
Download  11 Pages
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Fabricante Electrónico  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAT5122TBI-10GT3 Datasheet(HTML) 6 Page - ON Semiconductor

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CAT5120, CAT5121, CAT5122
http://onsemi.com
6
APPLICATIONS INFORMATION
The devices 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 9) to
select a portion of the input signal by digitally controlling the
wiper terminal. Figure 10 shows a similar circuit for the
CAT5121.
Adjustable Gain
Figures 11 and 12 show 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 devices have a low 5 ppm/C
ratiometric tempco that allows for a very stable adjustable
gain configuration over temperature.
30 V
W
L
H
+5 V
30 V
L
H
+5 V
L
H
L
H
W
CAT5120
CAT5121
CAT5121
CAT5120
Figure 9. Positive LCD Bias Control
Figure 10. Positive LCD Bias Control
Figure 11. Adjustable Gain Circuit
Figure 12. Adjustable Gain Circuit
VOUT
VOUT
VIN
VCC
VOUT
VIN
VOUT
VCC


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