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CAT5120 Schematic ( PDF Datasheet ) - ON Semiconductor

Teilenummer CAT5120
Beschreibung 16-Tap MiniPot Digitally Programmable Potentiometers
Hersteller ON Semiconductor
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Gesamt 11 Seiten
CAT5120 Datasheet, Funktion
CAT5120, CAT5121,
CAT5122
16‐tap Digital
Potentiometers (POTs)
with 2‐wire Interface
Description
CAT5120/5121/5122 linear-taper digital POTs perform the same
function as a mechanical potentiometer or a variable resistor. These
devices consist of a fixed resistor and a wiper contact with 16-tap
points that are digitally controlled through a 2-wire up/down serial
interface.
The CAT5120 is configured as a potentiometer. The CAT5121 and
CAT5122 are configured as variable resistors. See Pin Configurations
for part functionality.
Two resistance values are available: 10 kW and 50 kW. These are
available in space-saving 5-pin and 6-pin SC70 and SOT23
packages.
Features
0.3 mA Ultra-low Standby Current
Single-supply Operation: 2.7 V to 5.5 V
Glitchless Switching between Resistor Taps
Power-on Reset to Midscale
2-wire Up/Down Serial Interface
Resistance Values: 10 kW, 50 kW
Available in SC70 and SOT23 Packages
These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
LCD Screen Adjustment
Volume Control
Mechanical Potentiometer Replacement
Gain Adjustment
Line Impedance Matching
http://onsemi.com
SC70
SD SUFFIX
CASE 419AD
SOT23
TB SUFFIX
CASE 527AJ
SC70
SD SUFFIX
CASE 419AC
SOT23
TB SUFFIX
CASE 527AH
PIN CONFIGURATIONS
SC70
SOT23
VDD 1
6H
GND 2
5W
CAT5120
U/D 3
4 CS
SC70
SOT23
VDD 1
6H
GND 2
5L
CAT5121
U/D 3
4 CS
SC70
SOT23
VDD 1
5H
GND 2
CAT5122
U/D 3
4 CS
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
Semiconductor Components Industries, LLC, 2013
July, 2013 Rev. 8
1
Publication Order Number:
CAT5120/D






CAT5120 Datasheet, Funktion
CAT5120, CAT5121, CAT5122
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.
+5 V
H
W
CAT5120 L
30 V
VOUT
+5 V
H
CAT5121 L
30 V
VOUT
Figure 9. Positive LCD Bias Control
VCC
VIN
VOUT
H
CAT5121 L
Figure 11. Adjustable Gain Circuit
Figure 10. Positive LCD Bias Control
VCC
VIN VOUT
LW
H
CAT5120
Figure 12. Adjustable Gain Circuit
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