LT1991 - Precision, 100µA Gain Selectable Amplifier
Datasheet Documentation
Datasheet
Design Note
Reliability Data
LT Journal
Press Release
Software and Simulation
cad_symbol
Overview

Features

Typical Application

LT1991 Typical Application
LT1991 Typical Application

Description

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.

 

Packaging

3x3 DFN-10,MS-10

LT1991 Package Drawing
LT1991 Package Drawing
Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price
(1-99)		 Price
(1k)*
LT1991ACDD#PBF DFN 10 C $2.52 $2.09
LT1991ACDD#TRPBF DFN 10 C $2.15
LT1991ACMS#PBF MSOP 10 C $2.28 $1.89
LT1991ACMS#TRPBF MSOP 10 C $1.95
LT1991AIDD#PBF DFN 10 I $3.01 $2.49
LT1991AIDD#TRPBF DFN 10 I $2.55
LT1991AIMS#PBF MSOP 10 I $2.77 $2.29
LT1991AIMS#TRPBF MSOP 10 I $2.35
LT1991CDD#PBF DFN 10 C $2.10 $1.59
LT1991CDD#TRPBF DFN 10 C $1.65
LT1991CMS#PBF MSOP 10 C $1.80 $1.39
LT1991CMS#TRPBF MSOP 10 C $1.45
LT1991HDD#PBF DFN 10 H $2.30 $1.90
LT1991HDD#TRPBF DFN 10 H $1.96
LT1991HMS#PBF MSOP 10 H $2.05 $1.69
LT1991HMS#TRPBF MSOP 10 H $1.75
LT1991IDD#PBF DFN 10 I $2.30 $1.90
LT1991IDD#TRPBF DFN 10 I $1.96
LT1991IMS#PBF MSOP 10 I $2.05 $1.69
LT1991IMS#TRPBF MSOP 10 I $1.75
LT1991CMS MSOP 10 C $3.60 $2.78
LT1991CMS#TR MSOP 10 C $2.90
LT1991ACMS MSOP 10 C $4.56 $3.78
LT1991ACMS#TR MSOP 10 C $3.90
LT1991AIMS MSOP 10 I $5.54 $4.58
LT1991AIMS#TR MSOP 10 I $4.70
LT1991IMS MSOP 10 I $4.10 $3.38
LT1991IMS#TR MSOP 10 I $3.50
LT1991CDD DFN 10 C $4.20 $3.18
LT1991CDD#TR DFN 10 C $3.30
LT1991IDD DFN 10 I $4.60 $3.80
LT1991IDD#TR DFN 10 I $3.92
LT1991ACDD DFN 10 C $5.04 $4.18
LT1991ACDD#TR DFN 10 C $4.30
LT1991AIDD DFN 10 I $6.02 $4.98
LT1991AIDD#TR DFN 10 I $5.10
LT1991HMS MSOP 10 H $4.10 $3.38
LT1991HMS#TR MSOP 10 H $3.50
LT1991HDD DFN 10 H $4.60 $3.80
LT1991HDD#TR DFN 10 H $3.92
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.


Part Number Description Price Documentation
DC819A LT1990CS8/LT1991CMS/LT1995CMS | Configurable Gain Amplifiers, V+ = +2.5V to +15V, V- = -2.5V to -15V $75.00