LT2078 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LT2078 Datasheet PDF : 16 Pages
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LT 2078/LT 2079
TYPICAL APPLICATIONS
Picoampere Input Current, Triple Op Amp
Instrumentation Amplifier with Bias Current Cancellation
85V, –100V Common Mode Range
Instrumentation Amplifier (AV = 10)
–IN
3+
R2
1
1M
1/4 LT2079
2–
R1
1M
R3
2R
RG
9.1M
20M
200k
9–
6–
R1
1M
7
1/4 LT2079
8
1/4 LT2079
10 +
OUTPUT
4mV TO 8.2V
LT2078/79 • TA05
+IN
5+
R2
1M R3
9.1M
R
9V
10M
12 + 4
2R
14
1/4 LT2079
20M 13 –
11
( ) GAIN = 1 + 2R1 R3 = 100 FOR VALUES SHOWN
RG R2
INPUT BIAS CURRENT TYPICALLY < 150pA
INPUT RESISTANCE = 3R = 30M FOR VALUES SHOWN
1M
10M
+IN
10M
–IN
9V
10M
2– 8
1/2 LT2078 1 100k 6 –
3+
4
7
1/2 LT2078
100k 5 +
1M –9V
OUTPUT
8V TO –9V
LT2078/79 • TA06
BANDWIDTH= 2kHz
OUTPUT OFFSET= 8mV
OUTPUT NOISE= 0.8mVP-P (0.1Hz TO 10Hz)
= 1.4mVRMS OVER FULL BANDWIDTH
(DOMINATED BY RESISTOR NOISE)
INPUT RESISTANCE = 10M
NEGATIVE COMMON MODE LIMIT = (IB)(2R) + 20mV ≈ 140mV
GAIN BANDWIDTH PRODUCT = 1.8MHz
Half-Wave Rectifier
2M
2M
INPUT
1M
1.8V
–1.8V
3V
–
1/2 LT2078
OUTPUT
+
VOMIN = 6mV
NO DISTORTION TO 100Hz
1.8V
0V
LT2078/79 • TA07
3.5V
–3.5V
Absolute Value Circuit (Full-Wave Rectifier)
200k
INPUT
200k
5V
3.5V
2– 8
0V
1
1/2 LT2078
5+
3+
4
1N4148
7
1/2 LT2078
6–
OUTPUT
LT2078/79 • TA08
VOMIN = 4mV
NO DISTORTION TO 100Hz
Programmable Gain Amplifier (Single Supply)
1.11k
10k
100k
1M
3V TO 18V
2– 4
1/4 LT2079
3+
11
1
6–
1/4 LT2079
5+
7
9–
1/4 LT2079
IN
10 +
ERROR DUE TO SWITCH ON RESISTANCE,
LEAKAGE CURRENT, NOISE AND TRANSIENTS
ARE ELIMINATED
3V TO 18V
11
1
A
2
3B
4
9
C
88
7
CD4016B
13 5 6
13 –
1/4 LT2079
12 +
14 OUT
LT2078/79 • TA09
GAIN
1000
100
10
CD4016B
PIN 13 PIN 5 PIN 6
HIGH LOW LOW
LOW HIGH LOW
LOW LOW HIGH
20789fa
13
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