LT1079 Linear Technology Corporation, LT1079 Datasheet - Page 13

• Manufacturer Part Number: LT1079
• Description: Lt1079 - Micropower, Dual And Quad, Single Supply, Precision Op Amps
• Manufacturer: Linear Technology Corporation

TYPICAL APPLICATIONS
LT1034BC-1.2
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
–IN
+IN
–9V BATTERY = 85 A
510k
P-P
1%
9V
, 0.1Hz TO 10Hz
1
R
10M
1M
2R
20M
510k
5.000V
20M
2R
U
OUT
6
5
12
13
3
2
6
5
–
+
1/2 LT1078
–
+
–
+
+
–
1/4 LT1079
1/4 LT1079
1/4 LT1079
1M
9V
4
11
7
14
1
7
LT1078/79 • TA03
–5.000V
R1
1M
R
200k
R1
1M
1M
R2
G
1M
R2
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
OUT
10
R3
9.1M
9
–
+
1/4 LT1079
R
G
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
R3
R2
–IN
+IN
= 100 FOR VALUES SHOWN
OUTPUT OFFSET= 0.7mV
8
OUTPUT NOISE= 80 V
1M
1M
BANDWIDTH= 20kHz
R3
9.1M
Gain of 10 Difference Amplifier
OUTPUT
4mV TO 8.2V
LT`1078/79 • TA05
10M
B
–
+
)(2R) + 20mV 140mV
1/2 LT1078
10M
3V
260 V
BANDWIDTH
P-P
RMS
LT1078/LT1079
(0.1Hz TO 10Hz)
OVER FULL
OUTPUT
0.0035V TO 2.4V
LT1078/79 • TA04
13
10789fe