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Linear Technology Electronic Components Datasheet

LT1991 Datasheet

Precision / 100uA Gain Selectable Amplifier

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LT1991www.DataSheet4U.com
Precision, 100µA
Gain Selectable Amplifier
FEATURES
n Pin Configurable as a Difference Amplifier,
Inverting and Noninverting Amplifier
n Difference Amplifier
Gain Range 1 to 13
CMRR >75dB
n Noninverting Amplifier
Gain Range 0.07 to 14
n Inverting Amplifier
Gain Range –0.08 to –13
n Gain Error <0.04%
n Gain Drift < 3ppm/°C
n Wide Supply Range: Single 2.7V to Split ±18V
n Micropower: 100μA Supply Current
n Precision: 50μV Maximum Input Offset Voltage
n 560kHz Gain Bandwidth Product
n Rail-to-Rail Output
n Space Saving 10-Lead MSOP and DFN Packages
APPLICATIONS
n Handheld Instrumentation
n Medical Instrumentation
n Strain Gauge Amplifiers
n Differential to Single-Ended Conversion
DESCRIPTION
The LT®1991 combines a precision operational amplifier
with eight precision resistors to form a one-chip solution
for accurately amplifying voltages. Gains from –13 to 14
with a gain accuracy of 0.04% can be achieved using no
external components. The device is particularly well suited
for use as a difference amplifier, where the excellent resis-
tor matching results in a common mode rejection ratio of
greater than 75dB.
The amplifier features a 50μV maximum input offset volt-
age and a gain bandwidth product of 560kHz. The device
operates from any supply voltage from 2.7V to 36V and
draws only 100μA supply current on a 5V supply. The
output swings to within 40mV of either supply rail.
The resistors have excellent matching, 0.04% over tem-
perature for the 450k resistors. The matching temperature
coefficent is guaranteed less than 3ppm/°C. The resistors
are extremely linear with voltage, resulting in a gain non-
linearity of less than 10ppm.
The LT1991 is fully specified at 5V and ±15V supplies and
from –40°C to 125°C. The device is available in space
saving 10-lead MSOP and low profile (0.8mm) 3mm ×
3mm DFN packages.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
VM(IN)
ΔVIN +
VP(IN)
INPUT RANGE
–0.5V TO 5.1V
RIN = 900kΩ
Rail-to-Rail Gain = 1 Difference Amplifier
5V
50k
150k
450k
450k
150k
50k
450k
4pF
+ LT1991
450k
4pF
VOUT = VREF + ΔVIN
SWING 40mV TO
EITHER RAIL
ROUT <0.1Ω
VREF = 2.5V
1991 TA01
Distribution of Resistor Matching
40
450k RESISTORS
35 LT1991A
30
25
20
15
10
5
0
–0.04
–0.02
0
0.02
RESISTOR MATCHING (%)
0.04
1991 TA01b
1991fg
1


Linear Technology Electronic Components Datasheet

LT1991 Datasheet

Precision / 100uA Gain Selectable Amplifier

No Preview Available !

LT1991
www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Total Supply Voltage (V+ to V) ................................40V
Input Voltage (Pins P1/M1, Note 2) .......................±60V
Input Voltage
(Other Inputs Note 2) ..................V+ + 0.2V to V– 0.2V
Output Short-Circuit Duration (Note 3) ........... Indefinite
Operating Temperature Range (Note 4)
LT1991C............................................... –40°C to 85°C
LT1991I................................................ –40°C to 85°C
LT1991H ............................................ –40°C to 125°C
Specified Temperature Range (Note 5)
LT1991C............................................... –40°C to 85°C
LT1991I................................................ –40°C to 85°C
LT1991H ............................................ –40°C to 125°C
Maximum Junction Temperature
DD Package .......................................................... 125°C
MS Package ......................................................... 150°C
Storage Temperature Range
DD Package............................................ –65°C to 125°C
MS Package ........................................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ................. 300°C
PIN CONFIGURATION
TOP VIEW
P1 1
P3 2
P9 3
VEE 4
REF 5
10 M1
9 M3
8 M9
7 VCC
6 OUT
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
EXPOSED PAD CONNECTED TO VEE PCB
CONNECTION OPTIONAL
TJMAX = 125°C, θJA = 43°C/W
P1 1
P3 2
P9 3
VEE 4
REF 5
TOP VIEW
10 M1
9 M3
8 M9
7 VCC
6 OUT
MS PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 230°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT1991CDD#PBF
LTCT1991CDD#TRPBF LBMM
10-Lead (3mm × 3mm) Plastic DFN –40°C to 85°C
LT1991ACDD#PBF
LT1991ACDD#TRPBF
LBMM
10-Lead (3mm × 3mm) Plastic DFN –40°C to 85°C
LT1991IDD#PBF
LT1991IDD#TRPBF
LBMM
10-Lead (3mm × 3mm) Plastic DFN –40°C to 85°C
LT1991AIDD#PBF
LT1991AIDD#TRPBF
LBMM
10-Lead (3mm × 3mm) Plastic DFN –40°C to 85°C
LT1991HDD#PBF
LT1991HDD#TRPBF
LBMM
10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C
LT1991CMS#PBF
LT1991CMS#TRPBF
LTQD
10-Lead Plastic MSOP
–40°C to 85°C
LT1991ACMS#PBF
LT1991ACMS#TRPBF LTQD
10-Lead Plastic MSOP
–40°C to 85°C
LT1991IMS#PBF
LT1991IMS#TRPBF
LTQD
10-Lead Plastic MSOP
–40°C to 85°C
LT1991AIMS#PBF
LT1991AIMS#TRPBF
LTQD
10-Lead Plastic MSOP
–40°C to 85°C
LT1991HMS#PBF
LT1991HMS#TRPBF
LTQD
10-Lead Plastic MSOP
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *Temperature grades are identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
1991fg
2


Part Number LT1991
Description Precision / 100uA Gain Selectable Amplifier
Maker Linear Technology
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LT1991 Datasheet PDF






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