X9318 Просмотр технического описания (PDF) - Intersil
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X9318 Datasheet PDF : 10 Pages
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X9318
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 computer-based digital controls, and (3) the retentivity
of nonvolatile memory used for the storage of multiple potentiometer settings or data.
Basic Configurations of Electronic Potentiometers
VREF
RH
VREF
RW
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
+8V
VS
100K
+8V
–
+
100K
VO
LMC7101
VO = (R2/R1)VS
Voltage Regulator
Offset Voltage Adjustment
VIN
317
VO (REG) VS
R1
R2
R1
100kΩ
+12V
–
Iadj
R2
10kΩ
+
LMC7101
VO (REG) = 1.25V (1+R2/R1)+Iadj R2
10kΩ
+12V
10kΩ
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)
8
FN8184.1
September 14, 2005
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