LT1997-3

RECOMMENDED FOR NEW DESIGNS

Precision, Wide Voltage Range Gain Selectable Amplifier

Data Sheet (Rev. A) Product Selection Table

Part Models: 8
1ku List Price: Starting From $3.77

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Overview

Pin Configurable as a Difference Amplifier, Inverting Amplifier or Noninverting Amplifier
91dB Minimum DC CMRR (Gain = 1)
65dB AC CMRR (at 100kHz, Gain = 1)
0.006% (60ppm) Maximum Gain Error (Gain = 1)
1ppm/°C Maximum Gain Error Drift
2ppm Maximum Gain Nonlinearity
±160V Common Mode Voltage Range

Wide Supply Voltage Range: 3.3V to 50V
Rail-to-Rail Output
350μA Supply Current
60μV Maximum Op Amp Offset Voltage
1.1MHz –3dB Bandwidth (Gain = 1)
Low-Power Shutdown: 20μA
Space-Saving MSOP and DFN Packages

The LT1997-3 combines a precision operational amplifier with highly-matched resistors to form a one-chip solution for accurately amplifying voltages. Gains from –13 to +14 with accuracy of 0.006% (60ppm) can be achieved using no external components. The LT1997-3 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 91dB.

The amplifier features a 60μV maximum input offset voltage and a -3dB bandwidth of 1.1MHz (Gain = 1). The LT1997-3 operates from any supply voltage from 3.3V to 50V and draws only 350μA supply current. The output typically swings to within 100mV of either supply rail.

The resistors maintain their excellent matching over temperature; the matching temperature coefficient is guaranteed less than 1ppm/°C. The resistors are extremely linear with voltage, resulting in a gain nonlinearity of less than 2ppm.

The LT1997-3 is fully specified at 5V and ±15V supplies and from –40°C to 125°C. The device is available in space saving 16-lead MSOP and 4mm × 4mm DFN14 packages.

Applications

High Side or Low Side Current Sensing
Bidirectional Wide Common Mode Range Current Sensing
High Voltage to Low Voltage Level Translation
Industrial Data-Acquisition Front-Ends
Replacement for Isolation Circuits
Differential to Single-Ended Conversion

Part Models: 8
1ku List Price: Starting From $3.77

Documentation

Data Sheet 1

LT1997-3: Precision, Wide Voltage Range Gain Selectable Amplifier Data Sheet (Rev.A) 03/14/2017

Technical Articles 1

LTspice: Worst-Case Circuit Analysis with Minimal Simulations Runs 06/08/2017

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
LT1997HDF-3#PBF	14(12)-Lead DFN (4mm x 4mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1997HDF-3#TRPBF	14(12)-Lead DFN (4mm x 4mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1997HMS-3#PBF	16(12)-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1997HMS-3#TRPBF	16(12)-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1997IDF-3#PBF	14(12)-Lead DFN (4mm x 4mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1997IDF-3#TRPBF	14(12)-Lead DFN (4mm x 4mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1997IMS-3#PBF	16(12)-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1997IMS-3#TRPBF	16(12)-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 4, 2020 - 20_0129 Laser Mark Conversion for 12-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0129_Form Material_Report
LT1997HMS-3#PBF	PRODUCTION
LT1997HMS-3#TRPBF	PRODUCTION
LT1997IMS-3#PBF	PRODUCTION
LT1997IMS-3#TRPBF	PRODUCTION

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

Software Resources

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Tools & Simulations

LTspice 3

Models for the following parts are available in LTspice:

LT1997-1
LT1997-2
LT1997-3

LT1997-3 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

LT1997 – Configurable Precision Amplifier

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Product Details

Demonstration Circuit 2551A is a Configurable Precision Amplifier featuring the LT1997.

The DC2551A-A supports the LT1997-3 version.

This demo board provides a rapid evaluation tool with jumpers providing the typical interconnection options that facilitate setting the pin-strapped internal gain configuration. The LT1997 is unusual in that it may be powered from a low voltage (down to 3.3V) while it accepts sign particularly high supply voltages, up to 50V. Connection points are provided to wire the amplifier in other configurations besides those possible with the jumpers alone.

Resources

DC2551A - Demo Manual (Rev.A)
8/7/2017

DC2551A - Schematic
8/7/2017

DC2551A - Design Files
8/7/2017

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