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| X9317 Datasheet, PDF (11/15 Pages) Intersil Corporation – Low Noise, Low Power, 100 Taps | |||
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X9317
Applications Information
Electronic digitally controlled (XDCP) potentiometers provide
three powerful application advantages; (1) the variability and
reliability of a solid-state potentiometer, (2) the flexibility of
Basic Configurations of Electronic Potentiometers
VREF
RH
RW
computer-based digital controls, and (3) the retentivity of
nonvolatile memory used for the storage of multiple
potentiometer settings or data.
VREF
RL
Three terminal potentiometer;
variable voltage divider
I
Two terminal variable resistor;
variable current
Basic Circuits
Buffered Reference Voltage
R1
+V
+5V
VREF
RW
LMC7101
+
VOUT
-
VOUT = VW/RW
Cascading Techniques
+V
+V
RW
+V
(a)
X
RW
(b)
Single Supply Inverting Amplifier
R1 R2
+5V
VS
100K
+5V
-
+
100K
VO
LMC7101
VO = (R2/R1)VS
Voltage Regulator
Offset Voltage Adjustment
VIN
317
R1
R2
VO (REG)
VS
R1
100kâ¦
+5V
-
Iadj
R2
10kâ¦
+
LMC7101
VO (REG) = 1.25V (1+R2/R1)+Iadj R2
10kâ¦
+5V
10kâ¦
Comparator with Hysteresis
LT311A
VS
-
VO
+
VO
R1
R2
VUL = {R1/(R1+R2)} VO(max)
VLL = {R1/(R1+R2)} VO(min)
(for additional circuits see AN115)
11
FN8183.1
September 9, 2005
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