LT1991

PRODUCTION

Precision, 100µA Gain Selectable Amplifier

Part Models: 20
1ku List Price: Starting From $1.88

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Overview

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

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

Part Models: 20
1ku List Price: Starting From $1.88

Documentation

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)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1991ACDD#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1991ACMS#PBF	10-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1991ACMS#TRPBF	10-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1991AIDD#PBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1991AIDD#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1991AIMS#PBF	10-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1991AIMS#TRPBF	10-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1991CDD#PBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1991CDD#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1991CMS#PBF	10-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1991CMS#TRPBF	10-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1991HDD#PBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1991HDD#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1991HMS#PBF	10-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1991HMS#TRPBF	10-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1991IDD#PBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1991IDD#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1991IMS#PBF	10-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1991IMS#TRPBF	10-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)
		PCN24_0003_Form Material_Report Qualification Results Summary Delta Qualification Matrix
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
Feb 4, 2020 - 20_0130 Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0130_Form Material_Report
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
Jul 12, 2022 - 22_0157 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages [With Modification in BOM]
		PCN22_0157_Form Material_Report Qualification Results Summary Delta Qualification Matrix Detailed Parts List
LT1991IMS#PBF	PRODUCTION
LT1991IMS#TRPBF	PRODUCTION
Jun 21, 2022 - 22_0050 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices
		PCN22_0050_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LT1991IMS#PBF	PRODUCTION
LT1991IMS#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

Evaluation Software 1

The Configurator Software Download

LT1991Configurator.zip (Rev. )

Can't find the software or driver you need?

Hardware Ecosystem

Parts	Product Life Cycle	Description
Interface Transceivers & Isolators 1
LTM2883	PRODUCTION	SPI/Digital or I²C μModule Isolator with Adjustable ±12.5V and 5V Regulated Power

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LT1991

LT1991 Online Design Tool - BETA

Online Design Tool – BETA helps configure difference amplifier gain and topology with consideration for supply and output common mode limitations, analyzes noise and input impedance, and generates a downloadable LTSpice file for further simulation.

Open Tool

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.

Evaluation Kits

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

Buy Now View Details

Product Details

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

DC819A - Demo Manual
9/24/2009

DC819A - Schematic
9/24/2009

DC819A - Design File
9/24/2009

Latest Discussions

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LT1991

Overview

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Application Note 1

Design Note 2

Technical Articles 3

Press Release 1