LT1112/LT1114
Dual/Quad Low Power
Precision, Picoamp Input Op Amps
U
FEATURES
DESCRIPTIO
■
The LT®1112 dual and LT1114 quad op amps achieve a
new standard in combining low cost and outstanding
precision specifications.
■
■
■
■
■
■
■
■
■
■
■
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
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 instrumentation 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
U
■
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.
TYPICAL APPLICATIO
Distribution of Input Offset Voltage
(In All Packages)
Dual Output, Buffered Reference (On Single 3V Supply)
30
3V
–
2
8
1/2 LT1112
75k
0.1%
+
3
1
LT1004-1.2
25
PERCENT OF UNITS
15k
TOTAL SUPPLY CURRENT = 700µA
2V REFERENCE: SOURCES 1.7mA, SINKS 5mA
RX
OPTIONAL RX = 300Ω INCREASES SOURCE
CURRENT TO 5mA
0.765V REFERENCE: SOURCES 5mA,
SINKS 0.5mA
TEMPERATURE COEFFICIENT LIMITED
BY REFERENCE = 20ppm/°C
2.000V
MINIMUM SUPPLY = 2.7V
VS = ±15V
TA = 25°C
20
15
10
5
–
6
1/2 LT1112
46.4k
0.1%
+
5
7
0.765V
4
0
–70 –50
50
30
–30 –10 10
INPUT OFFSET VOLTAGE (µV)
70
LT1112/14 • TA02
LT1112/14 • TA01
111214fb
1
