CAT5122SDI-50-GT3 ON Semiconductor, CAT5122SDI-50-GT3 Datasheet - Page 5

• Manufacturer Part Number: CAT5122SDI-50-GT3
• Manufacturer: ON Semiconductor

Specifications of CAT5122SDI-50-GT3

• Number Of Elements: 1
• # Of Taps: 16
• Resistance (max): 50KOhm
• Power Supply Requirement: Single
• Interface Type: Serial (2-Wire)
• Single Supply Voltage (typ): 3.3/5V
• Dual Supply Voltage (typ): Not RequiredV
• Single Supply Voltage (min): 2.7V
• Single Supply Voltage (max): 5.5V
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 5
• Package Type: SC-70
• Lead Free Status / Rohs Status: Compliant

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.
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
Figure 3. Positive LCD Bias Control
CAT5120
Figure 5a. Adjustable Gain Circuit
+5V
H
L
CAT5121
W
V
IN
H
L
V
CC
30V
V
OUT
V
OUT
5
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 5b. Adjustable Gain Circuit
Figure 4. Positive LCD Bias Control
CAT5121
L
V
IN
+5V
CAT5120
W
H
L
CAT5120, CAT5121, CAT5122
H
V
CC
30V
V
OUT
Doc. No. MD-2121 Rev. G
V
OUT