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Low Voltage High Impedance Instrumentation Amplifier
Micro-Power LCD Contrast Control
Single Supply Variable Gain Amplifier
+
-
U1A
10k 50k
-
+
U1C
Gain =
50k
10k
1 +
50k
R
TOTAL
)
(
U1 = LT1467
V
OUT
50k
-
+
U1B
10k
50k
50k
X93154 (R
TOTAL
)
10k
+
10k
-
V
IN
3.3V
+
-
U1A
100k
300k
-
+
U1B
1 +
100k
50k + R
TOTAL
)
(
U1 = LMC6042
V
OUT
= -3.88
-12V
100k
X93154 (R
TOTAL
)
240k
3.3V
100k
3.3V
50k
V
OUT
= -2.75V TO -11.6V
Gain =
R
TOTAL
10k
+
-
U1
20k
3.3V
20k
3.3V
V
OUT
U1 = LMC6042
10k
V
IN
X93154
(R
TOTAL
)
X93154
