X93254 Datasheet, PDF (8/10 Pages) Intersil Corporation – Dual Digitally Controlled Potentiometers

X93254
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.
I ^VR
Two terminal variable resistor.
Low Voltage High Impedance Instrumentation Amplifier
3.3V
10K
+
+
10K
U1A
–
50K
V_IN
1_{/ 2 X93254 (RTOTAL)}
50K
–
10K
10K
–
U1B
+
50K
–
U1C
+
V_OUT
( ) ^Gain
=
50K
10K
1
+
50K
R_TOTAL
U1 = LT1467
50K
Micro-Power LCD Contrast Control
3.3V
240K
100K
3.3V
+
U1A
–
50K ^100K
300K
100K
–
U1B
+
–12V
1_{/ 2 X93254 (RTOTAL)}
( ) V_OUT = -3.88
1
+
100K
50K + R_TOTAL
V_OUT = -2.75V to -11.6V
U1 = LMC6042
8
FN8186.0
March 1, 2005