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
AEC-Q100 data available for specific packages
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 |
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 Now • Request Samples | ||||||
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 | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports 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 Now • Request Samples | ||||||
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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LT1990
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
