X9319 Xicor, X9319 Datasheet - Page 8

• Manufacturer Part Number: X9319
• Description: Digitally Controlled Potentiometer (XDCP)
• Manufacturer: Xicor

APPLICATIONS INFORMATION
Electronic digitally controlled (XDCP) potentiometers provide three powerful application advantages; (1) the vari-
ability 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
REV 1.7 7/10/03
V
+V
IN
V
O
(REG) = 1.25V (1+R
Buffered Reference Voltage
R
V
Voltage Regulator
1
REF
I
adj
317
Three terminal potentiometer;
variable voltage divider
R
R
2
W
2
V
/R
V
OUT
REF
1
R
)+I
+
–
1
+5V
adj
= V
LMC7101
R
W
R
2
R
/R
H
L
V
W
O
V
(REG)
OUT
R
W
+15V
V
Offset Voltage Adjustment
Cascading Techniques
10KΩ
+V
+V
S
10KΩ
www.xicor.com
(a)
100KΩ
R
1
R
10KΩ
W
LMC7101
–
+
+V
+12V
R
(b)
2
X
Two terminal variable resistor;
variable current
R
W
V
O
+10V
V
V
V
V
Single Supply Inverting Amplifier
V
S
Comparator with Hysteresis
UL
LL
REF
S
= {R
= {R
100K
I
(for additional circuits see AN115)
LT311A
R
1
1
/(R
1
R
/(R
1
1
1
+R
+R
R
2
2
R
2
)} V
100K
)} V
–
+
2
V
O
O
O
(min)
(max)
–
+
= (R2/R1)V
+8V
LMC7101
X9319
8 of 10
S
V
V
O
O