LT1078I Linear Technology, LT1078I Datasheet - Page 13

• Manufacturer Part Number: LT1078I
• Description: Micropower/ Dual and Quad/ Single Supply/ Precision Op Amps
• Manufacturer: Linear Technology

LT1034BC-1.2
TYPICAL APPLICATIONS
THE LT1078 CONTRIBUTES LESS THAN 3% OF THE TOTAL OUTPUT NOISE AND
DRIFT WITH TIME AND TEMPERATURE. THE ACCURACY OF THE –5V OUTPUT
DEPENDS ON THE MATCHING OF THE TWO 1M RESISTORS
160k
1%
SUPPLY CURRENT = 9V BATTERY = 115 A
OUTPUT NOISE = 36 V
20k
120k 3
Micropower, 10ppm/ C, 5V Reference
220k
2M
2
Picoampere Input Current, Triple Op Amp Instrumentation Amplifier with Bias Current Cancellation
+
–
1/2 LT1078
–9V
8
4
–9V BATTERY = 85 A
510k
P-P
1%
9V
, 0.1Hz TO 10Hz
–IN
+IN
1
1M
R
10M
510k
5.000V
U
2R
20M
OUT
20M
6
5
2R
–
+
1/2 LT1078
12
13
1M
3
2
6
5
+
–
–
+
+
–
1/4 LT1079
1/4 LT1079
1/4 LT1079
9V
7
4
11
LT1078/79 • TA03
–5.000V
14
1
7
R1
1M
R
200k
R1
1M
OUT
1M
R2
G
R2
1M
GAIN = 1 + 2R1
INPUT BIAS CURRENT TYPICALLY < 150pA
INPUT RESISTANCE = 3R = 30M FOR VALUES SHOWN
NEGATIVE COMMON MODE LIMIT = (I
GAIN BANDWIDTH PRODUCT = 1.8MHz
10
R3
9.1M
9
–
+
THE USEFULNESS OF DIFFERENCE AMPLIFIERS IS LIMITED BY
THE FACT THAT THE INPUT RESISTANCE IS EQUAL TO THE SOURCE
RESISTANCE. THE PICOAMPERE OFFSET CURRENT AND LOW
CURRENT NOISE OF THE LT1078 ALLOWS THE USE OF 1M SOURCE
RESISTORS WITHOUT DEGRADATION IN PERFORMANCE. IN ADDITION,
WITH MEGOHM RESISTORS MICROPOWER OPERATION CAN BE MAINTAINED
1/4 LT1079
R
–IN
+IN
G
R3
R2
OUTPUT OFFSET= 0.7mV
OUTPUT NOISE= 80
1M
1M
= 100 FOR VALUES SHOWN
BANDWIDTH= 20kHz
8
Gain of 10 Difference Amplifier
10M
R3
9.1M
–
+
1/2 LT1078
OUTPUT
4mV TO 8.2V
260
BANDWIDTH
LT`1078/79 • TA05
10M
3V
B
)(2R) + 20mV 140mV
V
V
P-P
RMS
LT1078/LT1079
(0.1Hz TO 10Hz)
OVER FULL
OUTPUT
0.0035V TO 2.4V
LT1078/79 • TA04
13