X9015USI-2.7 データシートの表示（PDF） - Xicor -> Intersil
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X9015USI-2.7 Datasheet PDF : 11 Pages
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X9015
APPLICATIONS INFORMATION
Electronic digitally-controlled (XDCP) potentiometers provide two powerful application advantages; (1) the variability and
reliability of a solid-state potentiometer, and (2) the flexibility of computer-based digital controls.
Basic Configurations of Electronic Potentiometers
VR
VR
VH
VW
VL
Three terminal potentiometer;
variable voltage divider
I
Two terminal variable resistor;
variable current
Basic Circuits
Buffered Reference Voltage
R1
+V
+5V
VREF
VW
+ OP-07
–
VOUT
–5V
VOUT = VW
Cascading Techniques
+V
+V
VW
+V
(a)
X
VW
(b)
Noninverting Amplifier
+5V
VS
+ LM308A
–
VO
–5V
R2
R1
VO = (1+R2/R1)VS
Voltage Regulator
Offset Voltage Adjustment
Comparator with Hysterisis
VIN
317
VO (REG) VS
R1
R2
R1
100KΩ
–
Iadj
R2
10KΩ
+
TL072
VO (REG) = 1.25V (1+R2/R1)+Iadj R2
10KΩ
10KΩ
+12V
-12V
VS LT311A –
+
VO
VO
R1 R2
VUL = {R1/(R1+R2)} VO(max)
VLL = {R1/(R1+R2)} VO(min)
(for additional circuits see AN115)
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