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X9420 Datasheet, PDF (16/20 Pages) Xicor Inc. – Single Digitally Controlled (XDCP) Potentiometer | |||
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X9420
APPLICATIONS INFORMATION
Electronic 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
VR
VH
VW
VL
Three terminal Potentiometer;
Variable voltage divider
VR
I
Two terminal Variable Resistor;
Variable current
Basic Circuits
Buffered Reference Voltage
Cascading Techniques
R1
+V
VW
+V
+5V
VW
+ OP-07
â
VOUT = VW
+V
X
VW
-5V
+V
VW
(a)
(b)
Noninverting Amplifier
+5V
VS
+ LM308A
â
VO
-5V
R2
R1
VO = (1+R2/R1)VS
Voltage Regulator
Offset Voltage Adjustment
VIN
317
R1
R2
VO (REG) VS
R1
100kâ¦
â
Iadj
R2
10kâ¦
+
TL072
VO (REG) = 1.25V (1+R2/R1)+Iadj R2
10kâ¦
10kâ¦
+12V
-12V
Comparator with Hysterisis
VS
â
VO
+
VO
R1 R2
VUL = {R1/CR1+R2} VO(max)
VLL = {R1/CR1+R2} VO(min)
16
FN8195.0
March 7, 2005
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