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| X9116_06 Datasheet, PDF (7/9 Pages) Intersil Corporation – Digitally Controlled Potentiometer | |||
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X9116
Basic Configurations of Electronic Potentiometers
VR
VH
VW/RW
VL
THREE-TERMINAL POTENTIOMETER;
VARIABLE VOLTAGE DIVIDER
Basic Circuits
VR
I
TWO-TERMINAL VARIABLE RESISTOR;
VARIABLE CURRENT
BUFFERED REFERENCE VOLTAGE
R1
+V
+5V
VREF
VW
+
OP-07
â
VOUT
â5V
VOUT = VW/RW
CASCADING TECHNIQUES
+V
+V
X
VW/RW
+V
VW
(a)
(b)
NONINVERTING AMPLIFIER
+5V
VS
+
LM308A
â
VO
-5V
R2
R1
VO = (1+R2/R1)VS
VOLTAGE REGULATOR
VIN
317
VO (REG)
R1
Iadj
R2
VO (REG) = 1.25V (1+R2/R1)+Iadj R2
COMPARATOR WITH HYSTERESIS
VS
LT311A â
+
VO
R1
R2
VUL = {R1/(R1+R2)} VO(max)
VLL = {R1/(R1+R2)} VO(min)
(FOR ADDITIONAL CIRCUITS, SEE AN115)
7
FN8160.2
September 26, 2006
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