LT1078_15 Datasheet, PDF (1/20 Pages) Linear Technology – Micropower, Dual and Quad, Single Supply, Precision Op Amps

LT1078/LT1079
FEATURES
Micropower, Dual and
Quad, Single Supply, Precision Op Amps
DESCRIPTIO
■ _{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}
U
APPLICATIO S
■ _{Battery or Solar-Powered Systems}
Portable Instrumentation
Remote Sensor Amplifier
Satellite Circuitry
■ _{Micropower Sample-and-Hold}
■ _{Thermocouple Amplifier}
■ _{Micropower Filters}
, LTC and LT are registered trademarks of Linear Technology Corporation.
The LT^®1078 is a micropower dual op amp in 8-pin
packages including the small outline surface mount pack-
age. 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 sup-
ply current without sacrificing other parameters. The
offset voltage achieved is the lowest on any dual or quad
nonchopper stabilized op amp—micropower or other-
wise. 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.
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 all-
NPN output stage swings to within a few millivolts of
ground while sinking current—no power consuming pull
down resistors are needed.
TYPICAL APPLICATIO
Single Battery, Micropower, Gain = 100, Instrumentation Amplifier
10.1k
1M
1M
2^–
A
INVERTING ^{3 +1/2 LT1078}
INPUT –
3V (LITHIUM CELL)
1 ^10.1k 6 ^{– 8}
B
5 +^{1/2 LT1078}
NONINVERTING
INPUT +
4
7
OUT
LT1078/79 • TA01
TYPICAL PERFORMANCE
INPUT OFFSET VOLTAGE = 40μV
INPUT OFFSET CURRENT = 0.2nA
OUTPUT NOISE = 85μV_P-P 0.1Hz TO 10Hz
= 300μV_RMS OVER FULL BANDWIDTH
INPUT RANGE = 0.03V TO 1.8V
TOTAL POWER DISSIPATION = 240μW
OUTPUT RANGE = 0.03V TO 2.3V
COMMON MODE REJECTION = 110dB (AMPLIFIER LIMITED)
(0.3mV ≤ V_IN+ – V_IN– ≤ 23mV)
GAIN BANDWIDTH PRODUCT = 200kHz
OUTPUTS SINK CURRENT—NO PULL-DOWN RESISTORS
ARE NEEDED
Distribution of Input Offset Voltage
(LT1078 and LT1079 in H, J, N Packages)
16
V_S = 5V, 0V
14 ^TA ^{= 25°C}
12
10
8
6
4
2
0
–120
–80 –40 0 40 80
INPUT OFFSET VOLTAGE (μV)
120
1078/79 • TA02
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