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PDF CAT5122 Data sheet ( Hoja de datos )
| Número de pieza | CAT5122 | |
| Descripción | (CAT5120 - CAT5122) 16-Tap MiniPot TM Digitally Programmable Potentiometers | |
| Fabricantes | Catalyst Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CAT5122 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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CAT5120, CAT5121, CAT5122
16-Tap MiniPot™ Digitally Programmable
Potentiometers with 2-Wire Interface
Features
■ 0.3µA Ultra-low supply current
■ Single-supply operation: 2.7V to 5.5V
■ Glitchless switching between resistor taps
■ Power-on reset to midscale
■ 2-Wire up/down serial interface
■ Resistance values: 10kΩ, 50kΩ and 100kΩ
■ Available in SC70 and SOT-23 packages
DEscription
CAT5120/5121/5122 linear-taper digitally programmable
potentiometers 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.
Applications
■ LCD screen adjustment
■ Volume control
■ Mechanical potentiometer replacement
■ Gain adjustment
■ Line impedance matching
Three resistance values are available: 10kΩ, 50kΩ and
100kΩ. These are available in space-saving 5-pin and
6-pin SC70 and SOT-23 packages.
Functional Diagram
www.DataSheet4U.com VDD
GND
H
For Ordering Information details, see page 10.
CS
W
Pin Configuration
sC70
sOT-23
sC70
sOT-23
VDD
6H
VDD
5H
GND 2
5W
CAT5120
U/D 3
4 CS
GND 2
CAT5122
U/D 3
4 CS
sC70
sOT-23
VDD
6H
GND 2
5L
CAT5121
U/D 3
4 CS
U/D
L
Pin Descriptions
Name
VDD
GND
U/D
CS
L
W
H
Description
Power Supply
Ground
Up/Down Control Input. With CS low, a low-
to-high transition increments or decrements
the wiper position.
Chip Select Input.Ahigh-to-low CS transition
determines the mode: increment if U/D is
high, or decrement if U/D is low.
Low Terminal of Resistor
Wiper Terminal of Resistor
High Terminal of Resistor
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc. No. 2121, Rev. C
1 page  
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.
CAT5120, CAT5121, CAT5122
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
+5V
H
W
CAT5120 L
30V
VOUT
Figure 4. Positive LCD Bias Control
+5V
H
30V
CAT5121 L
VOUT
Figure 5a. Adjustable Gain Circuit
VCC
VIN
VOUT
H
CAT5121 L
Figure 5b. Adjustable Gain Circuit
VCC
VIN
VOUT
W
L
H
CAT5120
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc No. 2121, Rev. C
5 Page 
Ordering Information
Part Number
CAT5120SDI-10-GT3
CAT5120SDI-10-GT10
CAT5120TBI-10-T3
CAT5120TBI-10-T10
CAT5120TBI-10-GT3
CAT5120TBI-10-GT10
CAT5120SDI-50-GT3
CAT5120SDI-50-GT10
CAT5120TBI-50-T3
CAT5120TBI-50-T10
CAT5120TBI-50-GT3
CAT5120TBI-50-GT10
CAT5120SDI-00-GT3
CAT5120SDI-00-GT10
CAT5120TBI-00-T3
CAT5120TBI-00-T10
CAT5120TBI-00-GT3
CAT5120TBI-00-GT10
CAT5121SDI-10-GT3
CAT5121SDI-10-GT10
CAT5121TBI-10-T3
CAT5121TBI-10-T10
CAT5121TBI-10-GT3
CAT5121TBI-10-GT10
CAT5121SDI-50-GT3
CAT5121SDI-50-GT10
CAT5121TBI-50-T3
CAT5121TBI-50-T10
CAT5121TBI-50-GT3
CAT5121TBI-50-GT10
CAT5121SDI-00-GT3
CAT5121SDI-00-GT10
CAT5121TBI-00-T3
CAT5121TBI-00-T10
CAT5121TBI-00-GT3
CAT5121TBI-00-GT10
Resistor
[kΩ]
10
10
10
10
10
10
50
50
50
50
50
50
100
100
100
100
100
100
10
10
10
10
10
10
50
50
50
50
50
50
100
100
100
100
100
100
Package
Marking
KC_
KC_
KCYM
KCYM
KCYM
KCYM
KD_
KD_
KDYM
KDYM
KDYM
KDYM
KE_
KE_
KEYM
KEYM
KEYM
KEYM
KF_
KF_
KFYM
KFYM
KFYM
KFYM
KG_
KG_
KGYM
KGYM
KGYM
KGYM
KH_
KH_
KHYM
KHYM
KHYM
KHYM
CAT5120, CAT5121, CAT5122
Pin Package
SC70-6
SC70-6
SOT23-6
SOT23-6
SOT23-6
SOT23-6
SC70-6
SC70-6
SOT23-6
SOT23-6
SOT23-6
SOT23-6
SC70-6
SC70-6
SOT23-6
SOT23-6
SOT23-6
SOT23-6
SC70-6
SC70-6
SOT23-6
SOT23-6
SOT23-6
SOT23-6
SC70-6
SC70-6
SOT23-6
SOT23-6
SOT23-6
SOT23-6
SC70-6
SC70-6
SOT23-6
SOT23-6
SOT23-6
SOT23-6
Quantity
per Reel
3,000
10,000
3,000
10,000
3,000
10,000
3,000
10,000
3,000
10,000
3,000
10,000
3,000
10,000
3,000
10,000
3,000
10,000
3,000
10,000
3,000
10,000
3,000
10,000
3,000
10,000
3,000
10,000
3,000
10,000
3,000
10,000
3,000
10,000
3,000
10,000
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
11
Doc No. 2121, Rev. C
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet CAT5122.PDF ] | |
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