LT1490A

PRODUCTION

Dual Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps

Part Models: 18
1ku List Price: Starting From $2.15

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Overview

Low Input Offset Voltage: 500µV Max
Output Swings to 10mV Max from V^–
Rail-to-Rail Input and Output
Micropower: 50µA/Amplifier Max
Over-The-Top^® Input Common Mode Range Extends 44V Above V^–, Independent of V⁺
Specified on 3V, 5V and ±15V Supplies
High Output Current: 20mA
Output Drives 10,000pF with Output Compensation
Reverse Battery Protection to 18V
No Supply Sequencing Problems
High Voltage Gain: 1500V/mV
High CMRR: 98dB
No Phase Reversal
Gain Bandwidth Product: 200kHz
Tiny 3mm × 3mm × 0.8mm DFN Package

The LT1490A/LT1491A are dual and quad op amps with a low input offset voltage of 500µV max. The LT1490A/LT1491A operate on all single and split supplies with a total voltage of 2V to 44V, drawing only 40µA of quiescent current per amplifier. These amplifiers are reverse supply protected; they draw virtually no current for reverse supply up to 18V. The input range of the LT1490A/LT1491A includes both supplies and the output swings to both supplies. Unlike most micropower op amps, the LT1490A/LT1491A can drive heavy loads; their rail-to-rail outputs drive 20mA. The LT1490A/LT1491A are unity-gain stable and drive all capacitive loads up to 10,000pF when optional 0.22µF and 150Ω compensation is used.

The LT1490A/LT1491A have a unique input stage that operates and remains high impedance when above the positive supply. The inputs take 44V both differential and common mode even when operating on a 3V supply. Built-in resistors protect the inputs for faults below the negative supply up to 15V. There is no phase reversal of the output for inputs 15V below V^– or 44V above V^–, independent of V⁺.

The LT1490A dual op amp is available in the 8-pin MSOP, PDIP and SO packages. For space limited applications LT1490A is available in a 3mm × 3mm × 0.8mm, dual fine pitch leadless package (DFN). The quad LT1491A is available in the 14-pin SO, PDIP and 5mm × 3mm × 0.8mm DFN packages.

Applications

Battery- or Solar-Powered Systems
- Portable Instrumentation
- Sensor Conditioning
Supply Current Sensing
Battery Monitoring
Micropower Active Filters
4mA to 20mA Transmitters

Part Models: 18
1ku List Price: Starting From $2.15

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
LT1490ACDD#PBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1490ACDD#TRPBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1490ACMS8#PBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1490ACMS8#TRPBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1490ACN8#PBF	8-Lead PDIP (Narrow 0.3 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1490ACS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1490ACS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1490AHMS8#PBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1490AHMS8#TRPBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1490AHS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1490AHS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1490AIDD#PBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1490AIDD#TRPBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1490AIMS8#PBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1490AIMS8#TRPBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1490AIN8#PBF	8-Lead PDIP (Narrow 0.3 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1490AIS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1490AIS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package
		PCN22_0244_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LT1490ACMS8#PBF	PRODUCTION
LT1490ACMS8#TRPBF	PRODUCTION
LT1490AHMS8#PBF	PRODUCTION
LT1490AHMS8#TRPBF	PRODUCTION
LT1490AIMS8#PBF	PRODUCTION
LT1490AIMS8#TRPBF	PRODUCTION
Feb 3, 2020 - 20_0128 Laser Top Mark for 8 Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0128_Form Material_Report
LT1490ACMS8#PBF	PRODUCTION
LT1490ACMS8#TRPBF	PRODUCTION
LT1490AHMS8#PBF	PRODUCTION
LT1490AHMS8#TRPBF	PRODUCTION
LT1490AIMS8#PBF	PRODUCTION
LT1490AIMS8#TRPBF	PRODUCTION
Oct 8, 2024 - 24_0234 Migrating Bottom Trace Code Marking to Top Side Laser Marking for PDIP Package
		PCN24_0234_Form Material_Report Marking Comparison
LT1490ACN8#PBF	PRODUCTION
LT1490AIN8#PBF	PRODUCTION
Oct 11, 2022 - 22_0241 Epoxy Change from Henkel 8290 to 8290A for PDIP Package
		PCN22_0241_Form Material_Report Qualification Results Summary
LT1490ACN8#PBF	PRODUCTION
LT1490AIN8#PBF	PRODUCTION
Aug 6, 2022 - 22_0172 Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG]
		PCN22_0172_Form Material_Report Delta Qualification Matrix
LT1490ACN8#PBF	PRODUCTION
LT1490AIN8#PBF	PRODUCTION
Oct 8, 2024 - 24_0236 Migrating Bottom Trace Code Marking to Top Side Laser Marking for SOIC_N Package
		PCN24_0236_Form Material_Report Marking Comparison Delta Qualification Matrix
LT1490ACS8#PBF	PRODUCTION
LT1490ACS8#TRPBF	PRODUCTION
LT1490AHS8#PBF	PRODUCTION
LT1490AHS8#TRPBF	PRODUCTION
LT1490AIS8#PBF	PRODUCTION
LT1490AIS8#TRPBF	PRODUCTION
Oct 12, 2022 - 22_0254 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 1 of 2)
		PCN22_0254_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LT1490ACS8#PBF	PRODUCTION
LT1490ACS8#TRPBF	PRODUCTION
LT1490AHS8#PBF	PRODUCTION
LT1490AHS8#TRPBF	PRODUCTION
LT1490AIS8#PBF	PRODUCTION
LT1490AIS8#TRPBF	PRODUCTION
Jun 11, 2021 - 21_0060 Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM
		PCN21_0060_Form Material_Report Delta Qualification Matrix
LT1490ACS8#PBF	PRODUCTION
LT1490ACS8#TRPBF	PRODUCTION
LT1490AHS8#PBF	PRODUCTION
LT1490AHS8#TRPBF	PRODUCTION
LT1490AIS8#PBF	PRODUCTION
LT1490AIS8#TRPBF	PRODUCTION

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

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Matched Resistors & Transistors 1
LT5400	RECOMMENDED FOR NEW DESIGNS	Quad Matched Resistor Network
Operational Amplifiers (Op Amps) 1
LT1636	PRODUCTION	Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LT1490
LT1490A

Analog Photodiode Wizard

Use Photodiode Wizard to design a transimpedance amplifier circuit to interface with a photodiode. Select a photodiode from the library included in the tool, or enter custom photodiode specifications. Quickly observe tradeoffs between Bandwidth, Peaking (Q), and ENOB/SNR. Modify circuit parameters, and immediately see results in plots for pulse response, frequency response, and noise gain.

Open Tool

Signal Chain Designer

Signal Chain Designer is a web-based tool designed to create and simulate complex precision signal chains. See your circuit’s performance before you commit to your PCB: transfer function, noise, power consumption, input range, and DC error. Quickly experiment with different parts and architectures. Signal chains can be exported to LTspice for further analysis.

Open Tool

Analog Filter Wizard

Use the Analog Filter Wizard to design low-pass, high-pass, or band-pass filters with actual op amps in minutes. As you progress through the design process, you can observe the characteristics of your filter design from ideal specifications to real world circuit behavior. Quickly evaluate the tradeoffs in op amp specifications - including gain-bandwidth, noise, and supply current – to determine the best filter design for your requirements.

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.