LT1991
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LT1991

Precision, 100µA Gain Selectable Amplifier

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LTspice LT1991 - Specialty Amplifiers, eval-adum540x - Digital Isolation Technology, LTC2057 - Operational Amplifiers (Op Amps) Download 2.54 KB LTspice LT1991 - Specialty Amplifiers Download 0.74 KB
Part Models 20
1ku List Price Starting From $1.88
Features
  • Pin Configurable as a Difference Amplifier, Inverting and Noninverting Amplifier
  • Difference Amplifier
    • Gain Range 1 to 13
    • CMRR >75dB
  • Noninverting Amplifier
    • Gain Range 0.07 to 14
  • Inverting Amplifier
    • Gain Range -0.08 to -13
  • Gain Error <0.04%
  • Gain Drift < 3ppm/°C
  • Wide Supply Range: Single 2.7V to Split ±18V
  • Micropower: 100µA Supply Current
  • Precision: 50µV Maximum Input Offset Voltage
  • 560kHz Gain Bandwidth Product
  • Rail-to-Rail Output
  • Space Saving 10-Lead MSOP and DFN Packages
Additional Details
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The LT1991 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 resistor matching results in a common mode rejection ratio of greater than 75dB.

The amplifier features a 50µV maximum input offset voltage 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 temperature 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 nonlinearity of less than 10ppm.

The LT1991 is fully specified at 5V and ±15V supplies and from -40°C to 85°C. The device is available in space saving 10-lead MSOP and low profile (0.8mm) 3mm × 3mm DFN packages.

Applications

  • Handheld Instrumentation
  • Medical Instrumentation
  • Strain Gauge Amplifiers
  • Differential to Single-Ended Conversion
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file View Data Sheet
Documentation View All Documentation
LTspice LT1991 - Specialty Amplifiers, eval-adum540x - Digital Isolation Technology, LTC2057 - Operational Amplifiers (Op Amps) Download 2.54 KB LTspice LT1991 - Specialty Amplifiers Download 0.74 KB
Part Models 20
1ku List Price Starting From $1.88
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LT1991

Documentation

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Data Sheet

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UPDATED 05/23/2012
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LT1991: Precision, 100µA Gain Selectable Amplifier Data Sheet

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UPDATED 07/10/2012
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LT1991: 高精度、100μA、利得を選択可能なアンプ データシート

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Reliability Data

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UPDATED 03/26/2018
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R423 Reliability Data redirect icon

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Design Note

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UPDATED 08/05/2014
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DN348 - Precise Gain Without External Resistors redirect icon

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UPDATED 10/25/2004
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DN348 - 在未采用外部电阻器的情况下获取精准增益 redirect icon

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UPDATED 05/23/2005
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DN348 外付け抵抗なしで精密利得を実現 redirect icon

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UPDATED 08/08/2008
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Design Note 448: 12-bit DAC in TSOT-23 Includes Bidirectional REF Pin for Connection to Op Amp or External High Precision Reference redirect icon

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UPDATED 08/08/2008
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设计要点 448：采用 TSOT-23 封装的 12 位 DAC 包括双向 REF 引脚以连接运算放大器或外部高精度基准 redirect icon

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UPDATED 08/08/2008
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DN-448: オペアンプまたは外部高精度リファレンスに接続するための双方向REFピンを備えたTSOT-23の12ビットDAC redirect icon

User Guide

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UPDATED 09/24/2009
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DC819A - Demo Manual redirect icon

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Application Note

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UPDATED 12/01/2005
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AN-105: Current Sense Circuit Collection Making Sense of Current redirect icon

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UPDATED 12/01/2005
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AN-105: 電流センス（検出）回路集 電流に対するセンスを養う redirect icon

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Documentation

Documentation

Technical Documents 6
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Data Sheet 1

LT1991: Precision, 100µA Gain Selectable Amplifier Data Sheet

Reliability Data 1

R423 Reliability Data

User Guide 1

DC819A - Demo Manual

Application Note 1

AN-105: Current Sense Circuit Collection Making Sense of Current

Design Note 2

DN348 - Precise Gain Without External Resistors
Design Note 448: 12-bit DAC in TSOT-23 Includes Bidirectional REF Pin for Connection to Op Amp or External High Precision Reference

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT1991ACDD#PBF 10-Lead DFN (3mm x 3mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT1991ACDD#TRPBF 10-Lead DFN (3mm x 3mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT1991ACMS#PBF 10-Lead MSOP external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT1991ACMS#TRPBF 10-Lead MSOP external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT1991AIDD#PBF 10-Lead DFN (3mm x 3mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT1991AIDD#TRPBF 10-Lead DFN (3mm x 3mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT1991AIMS#PBF 10-Lead MSOP external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT1991AIMS#TRPBF 10-Lead MSOP external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT1991CDD#PBF 10-Lead DFN (3mm x 3mm w/ EP) external-link
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  • Material Declaration external-link
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LT1991CDD#TRPBF 10-Lead DFN (3mm x 3mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT1991CMS#PBF 10-Lead MSOP external-link
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  • Material Declaration external-link
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LT1991CMS#TRPBF 10-Lead MSOP external-link
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  • Material Declaration external-link
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LT1991HDD#PBF 10-Lead DFN (3mm x 3mm w/ EP) external-link
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LT1991HDD#TRPBF 10-Lead DFN (3mm x 3mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT1991HMS#PBF 10-Lead MSOP external-link
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  • Material Declaration external-link
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LT1991HMS#TRPBF 10-Lead MSOP external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT1991IDD#PBF 10-Lead DFN (3mm x 3mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT1991IDD#TRPBF 10-Lead DFN (3mm x 3mm w/ EP) external-link
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  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LT1991IMS#PBF 10-Lead MSOP external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT1991IMS#TRPBF 10-Lead MSOP external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link

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Jun 5, 2024

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Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)

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Feb 4, 2020

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Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC

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Jul 12, 2022

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UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages [With Modification in BOM]

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Detailed Parts List

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Jun 5, 2024

- 24_0003

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Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)

LT1991ACMS#PBF

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LT1991ACMS#TRPBF

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LT1991AIMS#PBF

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LT1991AIMS#TRPBF

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LT1991CMS#PBF

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LT1991CMS#TRPBF

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LT1991HMS#PBF

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LT1991HMS#TRPBF

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LT1991IMS#PBF

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LT1991IMS#TRPBF

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pdf

PCN24_0003_Form

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xls

Material_Report

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pdf

Qualification Results Summary

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xlsm

Delta Qualification Matrix

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Feb 4, 2020

- 20_0130

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Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC

LT1991ACMS#PBF

PRODUCTION

LT1991ACMS#TRPBF

PRODUCTION

LT1991AIMS#PBF

PRODUCTION

LT1991AIMS#TRPBF

PRODUCTION

LT1991CMS#PBF

PRODUCTION

LT1991CMS#TRPBF

PRODUCTION

LT1991HMS#PBF

PRODUCTION

LT1991HMS#TRPBF

PRODUCTION

LT1991IMS#PBF

PRODUCTION

LT1991IMS#TRPBF

PRODUCTION

pdf

PCN20_0130_Form

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xls

Material_Report

Download
Jul 12, 2022

- 22_0157

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UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages [With Modification in BOM]

LT1991IMS#PBF

PRODUCTION

LT1991IMS#TRPBF

PRODUCTION

pdf

PCN22_0157_Form

external-icon

xls

Material_Report

Download

pdf

Qualification Results Summary

external-icon

xlsm

Delta Qualification Matrix

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Detailed Parts List
Jun 21, 2022

- 22_0050

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UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices

LT1991IMS#PBF

PRODUCTION

LT1991IMS#TRPBF

PRODUCTION

pdf

PCN22_0050_Form

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xls

Material_Report

Download

pdf

Qualification Results Summary

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xlsm

Delta Qualification Matrix

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Software & Part Ecosystem

Software & Part Ecosystem

Parts Product Life Cycle Description

I²C Isolators1
LTM2883
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PRODUCTION

SPI/Digital or I2C μModule Isolator with Adjustable ±12.5V and 5V Regulated Power

Evaluation Kit

Evaluation Kits 1

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DC819A

LT1990CS8/LT1991CMS/LT1995CMS | Configurable Gain Amplifiers, V+ = +2.5V to +15V, V– = –2.5V to –15V

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DC819A

LT1990CS8/LT1991CMS/LT1995CMS | Configurable Gain Amplifiers, V+ = +2.5V to +15V, V– = –2.5V to –15V

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DC819A
LT1990CS8/LT1991CMS/LT1995CMS | Configurable Gain Amplifiers, V+ = +2.5V to +15V, V– = –2.5V to –15V
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Product Detail

DC819A Demo Board for:

LT1990 ±250V Input Range G = 1, 10, Micropower, Difference Amplifier

LT1995 30MHz, 1000V/µs Gain Selectable Amplifier

LT1991 Precision, 100µA Gain Selectable Amplifier

Resources

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DC819A - Demo Manual Download

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DC819A - Schematic Download

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DC819A - Design File Download

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Evaluation Kits1

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DC819A

LT1990CS8/LT1991CMS/LT1995CMS | Configurable Gain Amplifiers, V+ = +2.5V to +15V, V– = –2.5V to –15V
Tools & Simulations

Tools & Simulations 2

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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LT1991 - Specialty Amplifiers, eval-adum540x - Digital Isolation Technology, LTC2057 - Operational Amplifiers (Op Amps) Download

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LT1991 - Specialty Amplifiers Download

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