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| X9317_14 Datasheet, PDF (9/13 Pages) Intersil Corporation – Low Noise, Low Power, 100 Taps, Digitally Controlled Potentiometer | |||
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X9317
Basic Configurations of Electronic Potentiometers
VREF
RH
VREF
RW
RL
I
FIGURE 3. THREE TERMINAL POTENTIOMETER; VARIABLE VOLTAGE
DIVIDER
FIGURE 4. TWO TERMINAL VARIABLE RESISTOR; VARIABLE CURRENT
Basic Circuits
R1
+V
VREF
+5V
RW
+
LMC7101
-
VOUT
VOUT = VW/RW
FIGURE 5. BUFFERED REFERENCE VOLTAGE
+V
+V
X
RW
+V
RW
(a)
(b)
FIGURE 6. CASCADING TECHNIQUES
R1 R2
+5V
VS
100k
+5V
-
+
100k
VO
LMC7101
VO = (R2/R1)VS
FIGURE 7. SINGLE SUPPLY INVERTING
AMPLIFIER
R1
R2
VIN
317
VS
VO (REG)
100kΩ
+5V
R1
-
+
VO
Iadj
R2
10kΩ
10kΩ
LMC7101
10kΩ
VO (REG) = 1.25V (1+R2/R1)+Iadj R2
FIGURE 8. VOLTAGE REGULATOR
+5V
FIGURE 9. OFFSET VOLTAGE ADJUSTMENT
LT311A
VS
-
VO
+
R1
R2
VUL = {R1/(R1+R2)} VO(max)
VLL = {R1/(R1+R2)} VO(min)
FIGURE 10. COMPARATOR WITH
HYSTERESIS
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9
FN8183.9
November 4, 2014
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