LT1024
Dual, Matched
Picoampere, Microvolt Input,
Low Noise Op Amp
U
FEATURES
DESCRIPTIO
The LT®1024 dual, matched internally compensated
universal precision operational amplifier can be used in
practically all precision applications requiring multiple op
amps. The LT1024 combines picoampere bias currents
(which are maintained over the full –55°C to 125°C
temperaturerange), microvoltoffsetvoltage(andlowdrift
with time and temperature), low voltage and current
noise and low power dissipation. Extremely high
common mode and power supply rejection ratios,
practically immeasurable warm-up drift, and the ability to
deliver 5mA load current with a voltage gain of a million,
round out the LT1024’s superb precision specifications.
■
Guaranteed Offset Voltage: 50µV Max
■
Guaranteed Bias Current:
25°C: 120pA Max
–55°C to 125°C: 700pA Max
■
Guaranteed Drift: 1.5µV/°C Max
■
Low Noise, 0.1Hz to 10Hz: 0.5µVP-P
■
Guaranteed Supply Current: 600µA Max
■
Guaranteed CMRR: 112dB Min
Guaranteed PSRR: 112dB Min
■
■
Guaranteed Voltage Gain with 5mA Load Current
Guaranteed Matching Characteristics
■
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Tight matching is guaranteed on offset voltage,
noninverting bias currents and common mode and power
supply rejections.
APPLICATIO S
■
Strain Gauge Signal Conditioner
■
Dual Limit Precision Threshold Detection
The all-around excellence of the LT1024 eliminates the
necessityofthetime-consumingerroranalysisprocedure
of precision system design in many dual applications; the
LT1024 can be stocked as the universal dual op amp in the
14-pin DIP configuration.
■
Charge Integrators
■
Wide Dynamic Range Logarithmic Amplifiers
■
Light Meters
■
Low Frequency Active Filters
■
Standard Cell Buffers
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For a single op amp with similar specifications, see the
LT1012 data sheet; for a single supply dual precision op
ampinthe8-pinconfiguration, seetheLT1013datasheet.
Thermocouple Amplifiers
, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATIO
Input Bias Current vs Temperature
Two Op Amp Instrumentation Amplifier
100
R5
R4
100k
2.2k†
R1*
100k
R2
10k
50
UNDERCANCELLED UNIT
0
3
4
R3
10k
–
OVERCANCELLED UNIT
13
10
11
1/2 LT1024
–
–50
–100
–150
6
+
1/2 LT1024
–
+
OUTPUT
INPUTS
+
TYPICAL PERFORMANCE:
OFFSET VOLTAGE = 20µV
BIAS CURRENT = ±30pA
OFFSET CURRENT = 30pA
R4
R3
1
2
R2 R3
R1 R4
R2 + R3
R5
–50
0
25
50
75 100 125
–25
GAIN =
1 +
+
+
~ 100
~
(
)
TEMPERATURE (°C)
LTC1024 • TA02
*
TRIM FOR COMMON-MODE REJECTION
† TRIM FOR GAIN
LT1024 • TA01
1024fa
1