LT1112_15 Datasheet, PDF (1/16 Pages) Linear Technology – Dual/Quad Low Power Precision, Picoamp Input Op Amps

LT1112/LT1114
Dual/Quad Low Power
Precision, Picoamp Input Op Amps
FEATURES
■ _{Offset Voltage – Prime Grade: 60µV Max}
■ _{Offset Voltage – Low Cost Grade}
(Including Surface Mount Dual/Quad): 75µV Max
■ _{Offset Voltage Drift: 0.5µV/°C Max}
■ _{Input Bias Current: 250pA Max}
■ _{0.1Hz to 10Hz Noise: 0.3µVP-P, 2.2pAP-P}
■ _{Supply Current per Amplifier: 400µA Max}
■ _{CMRR: 120dB Min}
■ _{Voltage Gain: 1 Million Min}
■ _{Guaranteed Specs with ±1.0V Supplies}
■ _{Guaranteed Matching Specifications}
■ _{SO-8 Package – Standard Pinout}
■ _{LT1114 in Narrow Surface Mount Package}
U
APPLICATIO S
■ _{Picoampere/Microvolt Instrumentation}
■ _{Two and Three Op Amp Instrumentation Amplifers}
■ _{Thermocouple and Bridge Amplifiers}
■ _{Low Frequency Active Filters}
■ _{Photo Current Amplifiers}
■ _{Battery-Powered Systems}
DESCRIPTIO
The LT^®1112 dual and LT1114 quad op amps achieve a
new standard in combining low cost and outstanding
precision specifications.
The performance of the selected prime grades matches or
exceeds competitive devices. In the design of the LT1112/
LT1114 however, particular emphasis has been placed on
optimizing performance in the low cost plastic and SO
packages. For example, the 75µV maximum offset voltage
in these low cost packages is the lowest on any dual or
quad non-chopper op amp.
The LT1112/LT1114 also provide a full set of matching
specifications, facilitating their use in such matching
dependent applications as two and three op amp instru-
mentation amplifiers.
Another set of specifications is furnished at ±1V supplies.
This, combined with the low 320µA supply current per
amplifier, allows the LT1112/LT1114 to be powered by
two nearly discharged AA cells.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Protected by U.S. Patents 4,575,685; 4,775,884 and 4,837,496
TYPICAL APPLICATIO
Dual Output, Buffered Reference (On Single 3V Supply)
75k
0.1%
15k
2– 8
1/2 LT1112
3+
LT1004-1.2
3V
TOTAL SUPPLY CURRENT = 700µA
2V REFERENCE: SOURCES 1.7mA, SINKS 5mA
R_X
OPTIONAL R_X = 300Ω INCREASES SOURCE
CURRENT TO 5mA
0.765V REFERENCE: SOURCES 5mA,
SINKS 0.5mA
TEMPERATURE COEFFICIENT LIMITED
1
2.000V ^{BY REFERENCE = 20ppm/°C}
MINIMUM SUPPLY = 2.7V
46.4k
0.1%
6–
7
1/2 LT1112
5+
4
0.765V
LT1112/14 • TA01
Distribution of Input Offset Voltage
(In All Packages)
30
V_S = ±15V
T_A = 25°C
25
20
15
10
5
0
–70 –50 –30 –10 10 30 50 70
INPUT OFFSET VOLTAGE (µV)
LT1112/14 • TA02
111214fb
1