X9313USIZT1 Datasheet, PDF (8/12 Pages) Intersil Corporation – Linear, 32 Taps, 3 Wire Interface, Terminal Voltages ± VCC

X9313
Applications Information
Electronic digitally controlled potentiometers (XDCP) provide
three powerful application advantages:
1. The variability and reliability of a solid-state potentiometer.
2. The flexibility of computer-based digital controls.
3. The retentivity of nonvolatile memory used for the storage
of multiple potentiometer settings or data.
Basic Configurations of Electronic Potentiometers
V_R
V_R
V_H
V_W/R_W
V_L
THREE-TERMINAL POTENTIOMETER;
VARIABLE VOLTAGE DIVIDER
Basic Circuits
I
TWO-TERMINAL VARIABLE RESISTOR;
VARIABLE CURRENT
BUFFERED REFERENCE VOLTAGE
R₁
+V
V_REF
+5V
VW
OP-07
+
V_OUT
–
-5V
V_OUT = V_W/R_W
CASCADING TECHNIQUES
+V
+V
VW/RW
+V
(a)
X
V_W
(b)
NONINVERTING AMPLIFIER
+5V
V_S
+
LM308A
V_O
–
-5V
R₂
R₁
V_O = (1 + R₂/R₁)V_S
VOLTAGE REGULATOR
OFFSET VOLTAGE ADJUSTMENT
COMPARATOR WITH HYSTERESIS
V_IN
317
V_O (REG)
R₁
I_adj
R₂
V_O (REG) = 1.25V (1 + R₂/R₁) + I_ADJ R₂
R₁
V_S
100kΩ
10kΩ
R₂
–
+
TL072
10kΩ
10kΩ
+12V
-12V
V_S ^LT311A –
V_O
+
V_O
R₁ R₂
V_UL = [R₁/(R₁ + R₂)] V_O(max)
V_LL = [R₁/(R₁ + R₂)] V_O(min)
(FOR ADDITIONAL CIRCUITS SEE AN115)
8
FN8177.6
January 15, 2008