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PDF LT1002MJ Data sheet ( Hoja de datos )
| Número de pieza | LT1002MJ | |
| Descripción | Dual / Matched Precision Operational Amplifier | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT1002
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 maching characteristics
s Low noise 0.35µV p-p
U
APPLICATIONS
s Thermocouple Amplifiers
s Strain Gauge Amplifiers
s Low level signal processing
s Medical instrumentation
s Precision dual limit threshold detection
s Instrumentation amplifiers
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.
Strain Gauge Signal Conditioner with Bridge Excitation
+15V
8.2k
2.0K*
LM329
4+
1/2LT1002
4.99k* 3 –
13 2k
IN4148
350Ω BRIDGE
+15V
100Ω 5W
2N2219
REFERENCE OUT
TO MONITORING
A/D CONVERTER
3+
6
* 10k LT1001
301k ZERO 2 –
1µF
10 –
1/2LT1002
11 +
IN4148
6 2k
2N2907
100Ω
5W
–15V
GAIN
TRIM
*RN60C FILM RESISTORS
0 TO 10V
OUT
340k*
1.1k*
1002 TA01
Distribution of Offset Voltage Match
70
VS = ±15V
60 TA = 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
1
1 page  
LT1002
TYPICAL PERFORMANCE CHARACTERISTICS
Distribution of Offset Voltage of
Individual Amplifiers
100
80
574 UNITS TESTED
VS = ±15V
TA = 25°C
60
Distribution of Offset Voltage Drift
with Temperature
(Individual Amplifiers)
70
VS = ±15V
60
260 UNITS TESTED
50
40
Distribution of Offset Voltage
Match Drift with Temperature
35
VS = ±15V
30
130 UNITS TESTED
25
20
40 30 15
20 10
20
10
5
0
–100 –80 –60 –40 –20 0 20 40 60 80 100
INPUT OFFSET VOLTAGE (µV)
1002 G01
Offset Voltage Drift with Temperature
of Six Representative Units
100
80
60
40 LT1002AM
20
LT1002M
LT1002AM
0 LT1002AM
–20 LT1002M
–40
LT1002M
–60
–80
–100
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
1002 G04
Long Term Stability of Four
Representative Units
10
5
0
0
–1.2
–0.8 –0.4 0 +0.4 +0.8 +1.2
INPUT OFFSET VOLTAGE DRIFT
WITH TEMPERATURE (µV/°C)
1002 G02
–1.2 –0.8 –0.4 0 +0.4 +0.8 +1.2
OFFSET VOLTAGE MATCH DRIFT
WITH TEMPERATURE (µV/°C)
1002 G03
Offset Voltage Tracking with Temperature
of Six Representative Units
100
80 VS = ±15V
60
LT1002AM
40
20
LT1002M
LT1002AM
0 LT1002M
–20 LT1002AM
–40
–60 LT1002M
–80
–100
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
1002 G04
Warm-Up Drift
5
VS = ±15V
TA = 25°C
4
N14 PLASTIC PACKGE
3
J14 HERMETIC DIP PACKGE
2
1
0
01 2 345
TIME AFTER POWER ON –
BOTH AMPLIFIERS (MINUTES)
1002 G06
0.1Hz to 10Hz Noise
Noise Spectrum
100
TA = 25°C
VS = ±3 TO ±18V
30 1/f CORNER
4Hz
10
VOLTAGE
10
3
1
–5
–10
0
1 2 34
TIME (MONTHS)
5
1001 G07
0 2 4 6 8 10
TIME (SECONDS)
1001 G08
3
1
1
1/f CORNER
70Hz
0.3
CURRENT
10 100
FREQUENCY (Hz)
0.1
1000
1002 G09
5
5 Page 
APPLICATIONS INFORMATION
Precision ±10V Reference
130k
5%
3.3k
1%
LM129A
4 + 14
1/2 LT1002
3 – 12
13
3.3k
1k
8.2k
1%
1%
10k
0.1%
10k
0.1%
10 –
7
1/2 LT1002
11 +
5
6
–15V
+15V
OUT 1
10.000V
OUT 2
–10.000V
1002 TA08
LT1002
The LT1002 contributes less than 5% of the total drift with The accuracy of the –10V output is limited by the matching
temperature, noise and long term drift of the reference. of the two 10k resistors.
UPPER
LIMIT
INPUT
LOWER
LIMIT
Dual Limit Microvolt Comparator
+15V
430k
14
3–
1
1/2 LT1002
4 + 12
1%
13
–15V
39.2Ω
1%
15k
1%
1k 5%
FLV117
1/4 CA3118
20k
5%
1/4 CA3118
430k
7
10 –
8
1/2 LT1002
11 +
5
1%
6
–15V
39.2Ω
1%
15k
1%
1/4 CA3118
1/4 CA3118
1002 TA09
When the upper or lower limit is exceeded the LED lights
up. Positive feedback to one of the nulling terminals
creates 5 to 20µV of hysteresis on both amplifiers. This
feedback changes the offset voltage of the LT1002 by less
than 5µV. Therefore, the basic accuracy of the comparator
is limited only by the low offset voltage of the LT1002.
11
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| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT1002MJ.PDF ] | |
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