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

Features

  • Pin Selectable Gain of 1 or 10
  • High Common Mode Voltage Range:
    85V Window (VS = 5V, 0V)
    ±250V (VS = ±15V)
  • Common Mode Rejection Ratio: 70dB Min
  • Input Protection to ±350V
  • Gain Error: 0.28% Max
  • PSRR: 82dB Min
  • High Input Impedance: 2MΩ Differential, 500kΩ Common Mode
  • Micropower: 120µA Max Supply Current
  • Wide Supply Range: 2.7V to 36V
  • –3dB Bandwidth: 100kHz
  • Rail-to-Rail Output
  • 8-Pin SO Package
Designed for Automotive and Transportation Applications
AEC-Q100 generic family data available for specific packages


Typical Application

LT1990 Typical Application

Description

The LT1990 is a micropower precision difference amplifier with a very high common mode input voltage range. It has pin selectable gains of 1 or 10. The LT1990 operates over a ±250V common mode voltage range on a ±15V supply. The inputs are fault protected from common mode voltage transients up to ±350V and differential voltages up to ±500V. The LT1990 is ideally suited for both high side and low side current or voltage monitoring.

On a single 5V supply, the LT1990 has an adjustable 85V input range, 70dB min CMRR and draws less than 120µA supply current. The rail-to-rail output maximizes the dynamic range, especially important for single supplies as low as 2.7V.

The LT1990 is specified for single 3V, 5V and ±15V supplies over both commercial and industrial temperature ranges. The LT1990 is available in the 8-pin SO package.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LT1990ACS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1990ACS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1990AHS8#PBF SO-8 S8 H 05-08-1610 (S8) Yes
LT1990AHS8#TRPBF SO-8 S8 H 05-08-1610 (S8) Yes
LT1990AIS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1990AIS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1990CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1990CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1990HS8#PBF SO-8 S8 H 05-08-1610 (S8) Yes
LT1990HS8#TRPBF SO-8 S8 H 05-08-1610 (S8) Yes
LT1990IS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1990IS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes


LT1990 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT1990ACS8#PBF SO-8 C $2.35 $1.95 Yes
LT1990ACS8#TRPBF SO-8 C $2.01 Yes
LT1990AHS8#PBF SO-8 H $2.82 $2.34 Yes
LT1990AHS8#TRPBF SO-8 H $2.40 Yes
LT1990AIS8#PBF SO-8 I $2.82 $2.34 Yes
LT1990AIS8#TRPBF SO-8 I $2.40 Yes
LT1990CS8#PBF SO-8 C $1.65 $1.35 Yes
LT1990CS8#TRPBF SO-8 C $1.41 Yes
LT1990HS8#PBF SO-8 H $1.95 $1.62 Yes
LT1990HS8#TRPBF SO-8 H $1.68 Yes
LT1990IS8#PBF SO-8 I $1.95 $1.62 Yes
LT1990IS8#TRPBF SO-8 I $1.68 Yes
Buy NowRequest Samples
* 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
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

Please contact your local sales representative for more information regarding reliability reports and AEC-Q100 data or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT1990AHS8#PBF SO-8 H $2.82 $2.34 Yes
LT1990AHS8#TRPBF SO-8 H $2.40 Yes
LT1990AIS8#PBF SO-8 I $2.82 $2.34 Yes
LT1990AIS8#TRPBF SO-8 I $2.40 Yes
LT1990HS8#PBF SO-8 H $1.95 $1.62 Yes
LT1990HS8#TRPBF SO-8 H $1.68 Yes
LT1990IS8#PBF SO-8 I $1.95 $1.62 Yes
LT1990IS8#TRPBF SO-8 I $1.68 Yes
Buy NowRequest Samples
* 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.

Applications

  • Battery Cell Voltage Monitoring
  • High Voltage Current Sensing
  • Signal Acquisition in Noisy Environments
  • Input Protection
  • Fault Protected Front Ends
  • Level Sensing
  • Isolation

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Design Tools

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Models for the following parts are available in LTspice:
LT1990

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