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PDF ( 数据手册 , 数据表 ) LT1002MJ

零件编号 LT1002MJ
描述 Dual / Matched Precision Operational Amplifier
制造商 Linear Technology
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LT1002MJ 数据手册, 描述, 功能
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
350BRIDGE
+15V
1005W
2N2219
REFERENCE OUT
TO MONITORING
A/D CONVERTER
3+
6
* 10k LT1001
301k ZERO 2
1µF
10
1/2LT1002
11 +
IN4148
6 2k
2N2907
100
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







LT1002MJ pdf, 数据表
LT1002
TYPICAL PERFORMANCE CHARACTERISTICS
Output Swing vs. Load Resistance
16
NEGATIVE SWING
12
POSITIVE SWING
8
4
0
100
VS = ±15V
TA = 25°C
300 1000 3k
LOAD RESISTANCE ()
10k
1002 G28
Output Short Circuit Current
vs Time
50
40 –55°C
30 25°C
20 125°C
10 VS = ±15V
–10 125°C
–20 25°C
–30 –55°C
–40
–50
0 123 4
TIME FROM OUTPUT SHORT (MINUTES)
1002 G29
APPLICATIONS INFORMATION
The LT1002 dual amplifier may be inserted directly into
OP-10, OP207, OP227 sockets with or without removal of
external nulling potentiometers.
Offset Voltage Adjustment The input offset voltage of the
LT1002, and its drift with temperature, are permanently
trimmed at wafer testing to a low level. However, if further
adjustment of VOS is necessary, nulling with a 10k or 20k
potentiometer will not degrade drift with temperature.
Trimming to a value other than zero creates a drift of (VOS/
300)µV/°C, e.g. if VOS is adjusted to 300µV, the change in
drift will be 1µV/°C. The adjustment range with a 10k or
20k pot is approximately ±2.5mV. If less adjustment
range is needed, the sensitivity and resolution of the
nulling can be improved by using a smaller pot in conjunc-
tion with fixed resistors. The example has an approximate
null range of ±100µV.
In matching applications, both amplifiers can be trimmed
to zero, or the offset of one amplifier can be trimmed to
match the offset of the other. Offset adjustment, however,
slightly degrades the gain, common-mode and power-
supply rejection match between the two op amps. Fortu-
nately, the guaranteed offset voltage match of the LT1002
is very low, in most applications offset adjustment will be
unnecessary.
Standard Adjustment
10k
or
20k
1 (8)
+15V
3
2
(9)
(10)
INPUT
1/2 LT1002
4+
14 (7) 13 (6)
OUTPUT
(11) 12 (5)
–15V
1002 TA03
Improved Sensitivity Adjustment
7.5k
1k +15V
7.5k
1 (8)
3
(10)
2 (9)
14 (7)
INPUT
1/2 LT1002
4 + 13 (6)
(11) 12 (5)
OUTPUT
–15V
1002 TA04
8







LT1002MJ equivalent, schematic
LT1002
16 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507 q TELEX: 499-3977
LT/GP 0396 2K REV A • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 1985










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