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CAT5110TBI-00GT3

P1-P3P4-P6P7-P9P10-P11
CAT5110, CAT5118, CAT5119, CAT5123, CAT5124, CAT5125
http://onsemi.com
4
TYPICAL OPERATING CHARACTERISTICS
(T
A
= 25C, unless otherwise noted.)
Figure 2. Wiper Resistance vs. Wiper Position Figure 3. Change in End-to-End Resistance vs.
Temperature
WIPER POSITION TEMPERATURE (C)
302520151050
0
20
40
60
100
120
140
160
100500−50
−1.5
−1.0
−0.5
0
0.5
1.0
1.5
Figure 4. W-to-L Resistance vs. Tap Position Figure 5. Supply Current vs. Temperature
TAP POSITION TEMPERATURE (C)
2925211713951
0
20
40
60
80
100
120
150100500−50
0
0.05
0.15
0.20
0.25
0.30
0.40
0.45
Figure 6. Tap-to-Tap Switching Transient
R
W
(W)
END−TO−END RESISTANCE
CHANGE (%)
RESISTANCE (kW)
CURRENT (mA)
80
CAT5110/5118/5119
CAT5123/5124/5125
V
DD
= 2.7 V
CAT5110/5118/5119
CAT5123/5124/5125
31272319151173
100 k
50 k
10 k
0.10
0.35
V
DD
= 2.7 V
V
DD
= 5.5 V
200 ns/div
U/D
2 V/div
WIPER
OUTPUT
100 mV/div
CAT5110, CAT5118, CAT5119, CAT5123, CAT5124, CAT5125
http://onsemi.com
5
FUNCTIONAL DESCRIPTION
The CAT5110/5118/5119/5123/5124/5125 consist of a
fixed resistor and a wiper contact with 32−tap points that are
digitally controlled through a 2-wire up/down serial
interface. Three end-to-end resistance values are available:
10 kW, 50 kW and 100 kW.
The CAT5110/5125 is designed to operate as a
potentiometer. In this configuration, the low terminal of the
resistor array is connected to ground (pin 2).
The CAT5118/5123 performs as a variable resistor. In this
device, the wiper terminal and high terminal of the resistor
array are connected at pin 5. The CAT5119/5124 is a similar
variable resistor, except the low terminal is connected to
pin 5.
Digital Interface Operation
The devices have two modes of operation when the serial
interface is active: increment and decrement mode. The
serial interface is only active when CS
is low.
The CS
and U/D inputs control the position of the wiper
along the resistor array. When CS
transitions from high to
low, the part will go into increment mode if U/D
input is
high, and into decrement mode when U/D
input is low. Once
the mode is set, the device will remain in that mode until CS
goes high again. A low-to-high transition at the U/D pin will
increment or decrement the wiper position depending on the
current mode (Figures 7 and 8).
When the CS
input transitions to high (serial interface
inactive), the value of the counter is stored and the wiper
position is maintained.
Note that when the wiper reaches the maximum (or
minimum) tap position, the wiper will not wrap around to the
minimum (or maximum) position.
Power-On Reset
All parts in this family feature power-on reset (POR)
circuitry that sets the wiper position to midscale at
power-up. By default, the chip is in the increment mode.
Figure 7. Serial Interface Timing Diagram, Increment Mode
W
U/D
CS
t
CU
t
CI
t
IL
t
IH
t
SETTLE
t
SETTLE
t
IC
Note: “W” is not a digital signal. It represents wiper transitions.
Figure 8. Serial Interface Timing Diagram, Decrement Mode
W
Note: “W” is not a digital signal. It represents wiper transitions.
t
SETTLE
t
CI
t
CU
U/D
CS
t
IH
t
IL
t
SETTLE
t
IC
CAT5110, CAT5118, CAT5119, CAT5123, CAT5124, CAT5125
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
An op amp can be used to provide buffering and gain on
the output of the CAT5110/CAT5125. This can be done by
connecting the wiper output to the positive input of a
noninverting op amp as shown in Figure 9. Figure 10 shows
a similar circuit for the CAT5119/CAT5124.
Adjustable Gain
Figures 11 and 12 show how to use either a variable
resistor or a potentiometer to digitally adjust the gain of a
noninverting op amp configuration, by connecting the
devices in series with a resistor to ground. 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
CAT5110/CAT5125
30 V
L
H
+5 V
CAT5119/CAT5124
L
H
L
H
W
CAT5110/CAT5125
CAT5118/CAT5123
Figure 9. Positive LCD Bias Control Figure 10. Positive LCD Bias Control
Figure 11. Adjustable Gain Circuit Figure 12. Adjustable Gain Circuit
V
OUT
V
OUT
V
IN
V
CC
V
OUT
V
IN
V
CC
V
OUT
P1-P3P4-P6P7-P9P10-P11

CAT5110TBI-00GT3

Mfr. #:
Buy CAT5110TBI-00GT3
Manufacturer:
ON Semiconductor
Description:
Digital Potentiometer ICs DPP MINIPOT 32 TAPS U/D
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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