X9318 INTERSIL [Intersil Corporation], X9318 Datasheet - Page 8

• Manufacturer Part Number: X9318
• Description: Digitally Controlled Potwntiometer(XSCP)
• Manufacturer: INTERSIL [Intersil Corporation]

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
Basic Circuits
V
+V
IN
V
O
(REG) = 1.25V (1+R
Buffered Reference Voltage
R
V
Voltage Regulator
REF
1
I
adj
317
Three terminal potentiometer;
variable voltage divider
R
R
2
W
2
V
/R
V
OUT
REF
R
1
8
)+I
+
–
1
+5V
adj
= V
LMC7101
R
R
W
R
2
H
/R
L
V
W
O
V
(REG)
OUT
R
W
+12V
V
Offset Voltage Adjustment
Cascading Techniques
10kΩ
+V
+V
S
10kΩ
(a)
100kΩ
X9318
R
1
R
10kΩ
W
LMC7101
–
+
+V
+12V
R
(b)
2
X
Two terminal variable resistor;
variable current
R
W
V
O
V
V
V
V
Single Supply Inverting Amplifier
+8V
V
S
UL
LL
Comparator with Hysteresis
REF
S
= {R
= {R
100K
I
(for additional circuits see AN115)
LT311A
R
1
1
1
R
/(R
/(R
1
1
1
+R
+R
R
2
R
2
2
100K
)} V
)} V
–
+
2
V
O
O
O
(min)
–
+
(max)
= (R2/R1)V
+8V
LMC7101
September 14, 2005
S
V
V
FN8184.1
O
O