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REV 1.4.1 7/29/03
www.xicor.com
X9252
APPLICATIONS INFORMATION
Basic Configurations of Electronic Potentiometers
Application Circuits
V
R
RW
+V
R
I
Three terminal Potentiometer;
Variable voltage divider
Two terminal Variable Resistor;
Variable current
Noninverting Amplifier
Voltage Regulator
Offset Voltage Adjustment
Comparator with Hysterisis
+
–
V
S
V
O
R
2
R
1
V
O
= (1+R
2
/R
1
)V
S
R
1
R
2
I
adj
V
O
(REG) = 1.25V (1+R
2
/R
1
)+I
adj
R
2
V
O
(REG)
V
IN
317
+
–
V
S
V
O
R
2
R
1
V
UL
= {R
1
/(R
1
+R
2
)} V
O
(max)
RL
L
= {R
1
/(R
1
+R
2
)} V
O
(min)
100K
10K
10K
10K
+5V
TL072
+
–
V
S
V
O
R
2
R
1
}
}
+5V