LT1078/LT1079
Micropower, Dual and
Quad, Single Supply, Precision Op Amps
DESCRIPTIO
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FEATURES
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Available in 8-Pin SO Package
50μA Max Supply Current per Amplifier
70μV Max Offset Voltage
180μV Max Offset Voltage in 8-Pin SO
250pA Max Offset Current
0.6μVP-P, 0.1Hz to 10Hz Voltage Noise
3pAP-P, 0.1Hz to 10Hz Current Noise
0.4μV/°C Offset Voltage Drift
200kHz Gain Bandwidth Product
0.07V/μs Slew Rate
Single Supply Operation
Input Voltage Range Includes Ground
Output Swings to Ground while Sinking Current
No Pull-Down Resistors Needed
Output Sources and Sinks 5mA Load Current
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APPLICATIO S
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The LT ® 1078 is a micropower dual op amp in 8-pin
packages including the small outline surface mount package. The LT1079 is a micropower quad op amp offered in
the standard 14-pin packages. Both devices are optimized
for single supply operation at 5V. ±15V specifications are
also provided.
Micropower performance of competing devices is achieved
at the expense of seriously degrading precision, noise,
speed and output drive specifications. The design effort of
the LT1078/LT1079 was concentrated on reducing supply current without sacrificing other parameters. The
offset voltage achieved is the lowest on any dual or quad
nonchopper stabilized op amp—micropower or otherwise. Offset current, voltage and current noise, slew rate
and gain bandwidth product are all two to ten times better
than on previous micropower op amps.
The 1/f corner of the voltage noise spectrum is at 0.7Hz,
at least three times lower than on any monolithic op amp.
This results in low frequency (0.1Hz to 10Hz) noise
performance which can only be found on devices with an
order of magnitude higher supply current.
Battery or Solar-Powered Systems
Portable Instrumentation
Remote Sensor Amplifier
Satellite Circuitry
Micropower Sample-and-Hold
Thermocouple Amplifier
Micropower Filters
Both the LT1078 and LT1079 can be operated from a
single supply (as low as one lithium cell or two Ni-Cad
batteries). The input range goes below ground. The allNPN output stage swings to within a few millivolts of
ground while sinking current—no power consuming pull
down resistors are needed.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATIO
Single Battery, Micropower, Gain = 100, Instrumentation Amplifier
10.1k
Distribution of Input Offset Voltage
(LT1078 and LT1079 in H, J, N Packages)
16
1M
14
1
6
+
–
A
1/2 LT1078
10.1k
5
NONINVERTING
INPUT
+
TYPICAL PERFORMANCE
INPUT OFFSET VOLTAGE = 40μV
INPUT OFFSET CURRENT = 0.2nA
TOTAL POWER DISSIPATION = 240μW
COMMON MODE REJECTION = 110dB (AMPLIFIER LIMITED)
GAIN BANDWIDTH PRODUCT = 200kHz
4
7
VS = 5V, 0V
TA = 25°C
12
8
B
1/2 LT1078
+
3
3V (LITHIUM CELL)
–
INVERTING
INPUT
2
–
1M
OUT
LT1078/79 • TA01
OUTPUT NOISE = 85μVP-P 0.1Hz TO 10Hz
= 300μVRMS OVER FULL BANDWIDTH
INPUT RANGE = 0.03V TO 1.8V
OUTPUT RANGE = 0.03V TO 2.3V
(0.3mV ≤ VIN+ – VIN– ≤ 23mV)
OUTPUTS SINK CURRENT—NO PULL-DOWN RESISTORS
ARE NEEDED
PERCENT OF UNITS
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10
8
6
4
2
0
–120
–80
–40
40
80
0
INPUT OFFSET VOLTAGE (μV)
120
1078/79 • TA02
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