X9C102, X9C103, X9C104, X9C503
Basic Configurations of Electronic Potentiometers
V
R
V
R
V /R
H
H
V
/R
W
W
V /R
L
L
I
THREE TERMINAL POTENTIOMETER;
VARIABLE VOLTAGE DIVIDER
TWO TERMINAL VARIABLE RESISTOR;
VARIABLE CURRENT
Basic Circuits
+V
+V
+V
+5V
R
1
LM308A
V
+V
+
–
S
+5V
V
O
V
W
OP-07
+
–
X
V
-5V
REF
V
/R
W
V
W
OUT
R
2
-5V
R
1
V
/R
W
W
V
= V /R
W W
OUT
V
= (1+R /R )V
2 1 S
O
(a)
(b)
BUFFERED REFERENCE VOLTAGE
CASCADING TECHNIQUES
NONINVERTING AMPLIFIER
R
R
2
1
LT311A
–
V
V
V (REG)
O
317
S
IN
V
S
V
O
100kΩ
+
R
1
–
+
V
O
I
adj
TL072
R
10kΩ
10kΩ
2
R
R
2
1
10kΩ
V
V
= {R /(R + R )} V (MAX)
1 1 2 O
= {R /(R + R )} V (MIN)
UL
LL
V
(REG) = 1.25V (1+R /R )+I
R
1
1
2
O
O
2
1
adj 2
+12V
-12V
(FOR ADDITIONAL CIRCUITS SEE AN1145)
COMPARATOR WITH HYSTERESIS
VOLTAGE REGULATOR
OFFSET VOLTAGE ADJUSTMENT
FN8222.3
July 20, 2009
8
INTERSIL [ Intersil ]
