LT1002_15 Datasheet, PDF (1/16 Pages) Linear Technology – Dual, Matched Precision Operational Amplifier

FEATURES
s _{Guaranteed low offset voltage}
LT1002A
60µV max
LT1002
100µV max
s _{Guaranteed offset voltage match}
LT1002A
40µV max
LT1002
80µV max
s _{Guaranteed low drift}
LT1002A 0.9µV/°C max
LT1002 1.3µV/°C max
s _{Guaranteed CMRR}
LT1002A
110dB min
LT1002
110dB min
s _{Guaranteed channel separation}
LT1002A
132dB min
LT1002
130dB min
s _{Guaranteed matching characteristics}
s _{Low noise 0.35µVP-P}
U
APPLICATIO S
s _{Thermocouple Amplifiers}
s _{Strain Gauge Amplifiers}
s _{Low level signal processing}
s _{Medical instrumentation}
s _{Precision dual limit threshold detection}
s _{Instrumentation amplifiers}
, LTC and LT are registered trademarks of Linear Technology Corporation
LT1002
Dual, Matched Precision
Operational Amplifier
DESCRIPTIO
The LT^®1002 dual, matched precision operational ampli-
fiers 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 commercial grade (LT1002C) have been spec-
tacularly improved compared to presently available de-
vices.
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 speci-
fied 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 adversely affecting noise or speed
performance. A by-product of lower dissipation is de-
creased 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 excellent
matching and individual amplifier specifications.
TYPICAL APPLICATIO
15V
8.2k
2k*
LM329
Strain Gauge Signal Conditioner with Bridge Excitation
4.99k*
4₊
1/2
LT1002
3_–
13 ^2k
IN4148
15V
100Ω 5W
2N2219
REFERENCE OUT
TO MONITORING
A/D CONVERTER
350Ω BRIDGE
301k*
3₊
10k
LT1001
ZERO 2 _–
6
1µF
10 _–
1/2
LT1002
11 ₊
IN4148
6 _2k
2N2907
100Ω
5W
–15V
GAIN
TRIM
*RN60C FILM RESISTORS
0V TO 10V
OUT
340k*
1.1k*
1002 TA01
Distribution of Offset Voltage Match
70
V_S = ±15V
60
T_A = 25°C
287 UNITS TESTED
50
40
30
20
10
0
–100 –80 –60 –40 –20 0 20 40 60 80 100
INPUT OFFSET VOLTAGE MATCH (µV)
1002 TA02
1002fb
1