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| X9315_09 Datasheet, PDF (12/16 Pages) Intersil Corporation – Digitally Controlled Potentiometer (XDCP™) | |||
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X9315
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
-5V
VOUT = VW/RW
Cascading Techniques
+V
+V
X
RW/VW
+V
RW/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)
12
FN8179.2
December 21, 2009
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