LT1002
Dual, Matched Precision
Operational Amplifier
FEATURES
s
DESCRIPTION
The LT
®
1002 dual, matched precision operational amplifiers
combine excellent individual amplifier performance with tight
matching and temperature tracking between amplifiers.
In the design, processing, and testing of the device, particular
attention has been paid to the optimization of the entire
distribution of several key parameters and their matching.
Consequently, the specifications of even the low cost commer-
cial grade (the LT1002C) have been spectacularly improved
compared to presently available devices.
Essentially, the input offset voltage of all units is less than
80µV, and matching between amplifiers is consistently beter
than 60µV (see distribution plot below). Input bias and offset
currents, channel separation, common mode and power suply
rejections of the LT1002C are all specified at levels which were
previsouly attainable only on very expensive, selected grades
of other dual devices. Power dissipation is nearly halved
compared to the most popular precision duals, without ad-
versely affecting noise or speed performance. A by-product of
lower dissipation is decreased warm-up drift. For even better
performance in a single precision op amp, refer to the LT1001
data sheet. A bridge signal conditioning application is shown
below. This circuit illustrates the requirement for both excel-
lent matching and individual amplifier specifications.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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Guaranteed
low offset voltage
LT1002A
60µV max
LT1002
100µV max
Guaranteed
offset voltage match
LT1002A
40µV max
LT1002
80µV max
Guaranteed
low drift
LT1002A
0.9µV/°C max
LT1002
1.3µV/°C max
Guaranteed
CMRR
LT1002A
110dB min
LT1002
110dB min
Guaranteed
channel separation
LT1002A
132dB min
LT1002
130dB min
Guaranteed
maching characteristics
Low noise 0.35µV p-p
APPLICATIONS
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Thermocouple Amplifiers
Strain Gauge Amplifiers
Low level signal processing
Medical instrumentation
Precision dual limit threshold detection
Instrumentation amplifiers
Strain Gauge Signal Conditioner with Bridge Excitation
+15V
+15V
8.2k
2.0K*
4
4.99k*
100Ω 5W
+
1
LM329
/
2
LT1002
13 2k
IN4148
2N2219
REFERENCE OUT
TO MONITORING
A/D CONVERTER
3
NUMBER OF UNITS
–
3
350Ω BRIDGE
*
301k
10k
ZERO 2
+
LT1001
6
1µF
0 TO 10V
OUT
340k*
–
10
–
1 2
IN4148
/ LT1002
6
2N2907
2k
100Ω
5W
*RN60C FILM RESISTORS
–15V
GAIN
TRIM
1.1k*
11
+
1002 TA01
U
U
Distribution of Offset Voltage Match
70
60
50
40
30
20
10
V
S
=
±15V
T
A
= 25°C
287 UNITS TESTED
0
–100 –80 –60 –40 –20 0 20 40 60 80 100
INPUT OFFSET VOLTAGE MATCH (µV)
1002 TA02
1
LINER [ LINEAR TECHNOLOGY ]
