LT1112 Linear Technology Corporation, LT1112 Datasheet

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LT1112

Manufacturer Part Number
LT1112
Description
Dual/Quad Low Power Precision, Picoamp Input Op Amps
Manufacturer
Linear Technology Corporation
Datasheet

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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
75k
0.1%
46.4k
0.1%
Picoampere/Microvolt Instrumentation
Two and Three Op Amp Instrumentation Amplifers
Thermocouple and Bridge Amplifiers
Low Frequency Active Filters
Photo Current Amplifiers
Battery-Powered Systems
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: 0.3µV
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
15k
LT1004-1.2
Dual Output, Buffered Reference (On Single 3V Supply)
2
3
6
5
+
+
1/2 LT1112
1/2 LT1112
U
8
4
7
1
P-P
R
LT1112/14 • TA01
X
, 2.2pA
U
3V
2.000V
0.765V
TOTAL SUPPLY CURRENT = 700µA
2V REFERENCE: SOURCES 1.7mA, SINKS 5mA
OPTIONAL R
CURRENT TO 5mA
0.765V REFERENCE: SOURCES 5mA,
SINKS 0.5mA
TEMPERATURE COEFFICIENT LIMITED
BY REFERENCE = 20ppm/°C
MINIMUM SUPPLY = 2.7V
P-P
X
= 300Ω INCREASES SOURCE
Precision, Picoamp Input Op Amps
DESCRIPTIO
The LT
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.
Protected by U.S. Patents 4,575,685; 4,775,884 and 4,837,496
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
®
1112 dual and LT1114 quad op amps achieve a
Dual/Quad Low Power
30
25
10
20
15
5
0
U
–70
Distribution of Input Offset Voltage
V
T
S
A
–50
= ±15V
= 25°C
INPUT OFFSET VOLTAGE (µV)
–30
(In All Packages)
LT1112/LT1114
–10
10
30
LT1112/14 • TA02
50
70
111214fb
1

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LT1112 Summary of contents

Page 1

... 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. ...

Page 2

... Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................ 300°C Operating Temperature Range (Note 11) LT1112AM/LT1112M LT1114AM/LT1114M (OBSOLETE)... – 55°C to 125°C LT1112AC/LT1112C/LT1112S8 LT1114AC/LT1114C/LT1114S .......... – 40°C to 85°C LT1112I/LT1114I .............................. – 40°C to 85°C LT1112MPS8 ................................... –55°C to 125°C U PACKAGE/ORDER I FOR ATIO TOP VIEW + OUT A ...

Page 3

... L ±11 2kΩ 10kHz 450 O = ±1. 10Hz O (Note 6) LT1114S/LT1114IS (Notes 6, 8) 117 (Notes 6, 8) 114 LT1112/LT1114 = 25°C, unless otherwise noted. A LT1112M/C/I LT1112AM/AC LT1114M/C/I LT1114AM/AC TYP MAX MIN TYP MAX 110 45 130 0.3 0.3 50 180 60 230 75 330 ±70 ±250 ±80 ± ...

Page 4

... CONDITIONS (Note 3) MIN ● LT1112CN8 ● LT1112S8, LT1114CN/S = ±1.2V ● ● LT1112CN8 ● LT1112S8, LT1114CN/S ● ● LT1114S ● ● LT1114S ±13.5 ● = ±13.5V ● V 118 CM = ±1.2V to ±20V ● V 114 S = ±12V, R ● ...

Page 5

... Note 3: Typical parameters are defined as the 60% yield of parameter distributions of individual amplifiers; i.e., out of 100 LT1114s (or 100 LT1112s) typically 240 op amps (or 120) will be better than the indicated specification. Note 4: This parameter is guaranteed by design and is not tested. LT1112/LT1114 = ±15V, unless otherwise noted. ...

Page 6

... LT1114S are guaranteed to meet specified performance from 0°C to 70°C and are designed, characterized and expected to meet specified performance from –40°C to 85°C, but are not tested or QA sampled at these temperatures. The LT1112I/LT1114I are guaranteed to meet specified performance from –40°C to 85°C. Input Bias Current Over ...

Page 7

... –2 –4 – TIME (MONTHS) LT1112/14 • TPC14 LT1112/LT1114 Distribution of Offset Voltage Match Drift (LT1112S8, LT1114N, LT1114S Packages ±15V V S 364 PAIRS TESTED 0.6 0.8 –1.6 –1.2 –0.8 –0.4 0 0.4 OFFSET VOLTAGE MATCH DRIFT (µV/°C) 0.01Hz to 1Hz Noise = ± ...

Page 8

... 25°C A 120 NEGATIVE SUPPLY 100 80 POSITIVE SUPPLY 100k 0 100 10k FREQUENCY (Hz) LT1112/14 • TPC23 Output Voltage Swing vs Load Current + – ±1V TO ± 20V 25° – ±1V = 1.3mA MAX ±1.5V = 3mA + V – ...

Page 9

... 100k 1M 0.00001 0.0001 0.001 0.01 0.1 CAPACITIVE LOAD (µF) LT1112/14 • TPC26 Undistorted Output Voltage vs Frequency ±15V ± 100 FREQUENCY (kHz LT1112/14 • TPC27 T = 25° 10k L 1000 LT1112/14 • TPC30 111214fb 9 ...

Page 10

... The well-known triple op amp configuration illustrates these concepts. Output offset is a function of the difference between the offsets of the two halves of the LT1112. This error cancellation principle holds for a considerable num- ber of input referred parameters in addition to offset voltage and its drift with temperature. Input bias current ...

Page 11

... impedance sources, the LT1114 is recommended because its CMRR vs frequency performance is better than the LT1112’s. For example, with two matched 1MΩ source GAIN = 1000 TRIM R8 FOR GAIN resistors, CMRR at 100Hz is 100dB with the LT1114, 76dB TRIM R9 FOR DC with the LT1112. ...

Page 12

... Q35 Q34 30pF 800Ω Q13 INVERTING S S INPUT – NONINVERTING Q10 INPUT + 15µA – (1/2 LT1112, 1/4 LT1114) 20µA 35µA Q22 4k Q21 S Q4 Q24 Q7 3k Q11 Q23 S Q3 50k 1.5k J1 Q12 Q16 460Ω 5µA Q14 5µA 460Ω ...

Page 13

... RAD TYP 0° – 15° .045 – .065 (1.143 – 1.651) .014 – .026 (0.360 – 0.660) OBSOLETE PACKAGES LT1112/LT1114 .405 (10.287) MAX .220 – .310 (5.588 – 7.874 .200 (5.080) MAX .015 – .060 (0.381 – ...

Page 14

... LT1112/LT1114 PACKAGE DESCRIPTIO .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) +.035 .325 –.015 ( +0.889 8.255 –0.381 NOTE: 1. DIMENSIONS ARE *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) .300 – ...

Page 15

... N .053 – .069 (1.346 – 1.752) 0° – 8° TYP .014 – .019 (0.355 – 0.483) TYP LT1112/LT1114 .189 – .197 (4.801 – 5.004) NOTE .150 – .157 (3.810 – 3.988) NOTE .004 – ...

Page 16

... TEMPERATURE COEFFICIENT LIMITED BY 1/2 LT1112 REFERENCE = 20ppm/° 20k 4 0.1% –1.5V –0.617V COMMENTS SOT- 1000pF LOAD 9.5nV/√Hz Input Noise 135µA Supply Current, 14nV/√Hz www.linear.com ● LT1112/14 • TA03 111214fb LT 0207 REV B • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 1992 ...

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