LT1787 - Precision, High Side Current Sense Amplifiers
Datasheet 
DocumentationDatasheet
Application Note
Design Note
Reliability Data
Product Selector Card
LT Journal
- Sep 1999 Four New Amplifiers Serve Many Applications
- Sep 1999 Micropower, Precision Current Sense Amplifier Operates from 2.5V to 60V
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Features
- Input Offset Voltage: 75µV (Max)
- 60V Supply Operation (LT1787HV)
- 12-Bit Dynamic Range
- Operating Current: 60µA
- User-Selectable External Sense Resistor
- Bidirectional High Side Current Sensing
- Unidirectional or Bidirectional Output
- Input Noise Filtering
- Available in 8-Lead SO and MSOP Packages
- –40°C to 125°C Operating Temperature Range
Typical Application
Description
The LT1787 is a complete micropower precision high side current sense amplifier. The LT1787 monitors bidirectional currents via the voltage across an external sense resistor. A current or voltage output indicates the direction and magnitude of the sense current. The LT1787 delivers greater than a 12-bit dynamic range with ultralow 40µV input offset voltage compared to a typical 250mV full-scale input voltage. A fixed gain of 8 is set by onboard precision resistors. Input signal filtering is easily implemented with a capacitor between the FIL– and FIL+ pins. The LT1787HV operates from 2.5V to 60V total supply voltage and the LT1787 operates from 2.5V to 36V total supply voltage. Both versions have a PSRR in excess of 120dB. The LT1787/LT1787HV draw only 60µA and are available in 8-lead SO and MSOP packages.MS-8,SO-8
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LT1787CMS8#PBF | MSOP | 8 | C | $2.60 | $2.25 |
| LT1787CMS8#TRPBF | MSOP | 8 | C | $2.31 | |
| LT1787CS8#PBF | SO | 8 | C | $2.40 | $2.05 |
| LT1787CS8#TRPBF | SO | 8 | C | $2.11 | |
| LT1787HS8#PBF | SO | 8 | H | $3.20 | $2.70 |
| LT1787HS8#TRPBF | SO | 8 | H | $2.75 | |
| LT1787HVCMS8#PBF | MSOP | 8 | C | $3.55 | $3.05 |
| LT1787HVCMS8#TRPBF | MSOP | 8 | C | $3.11 | |
| LT1787HVCS8#PBF | SO | 8 | C | $3.35 | $2.90 |
| LT1787HVCS8#TRPBF | SO | 8 | C | $2.96 | |
| LT1787HVHS8#PBF | SO | 8 | H | $4.10 | $3.60 |
| LT1787HVHS8#TRPBF | SO | 8 | H | $3.65 | |
| LT1787HVIMS8#PBF | MSOP | 8 | I | $4.45 | $3.85 |
| LT1787HVIMS8#TRPBF | MSOP | 8 | I | $3.91 | |
| LT1787HVIS8#PBF | SO | 8 | I | $3.95 | $3.45 |
| LT1787HVIS8#TRPBF | SO | 8 | I | $3.51 | |
| LT1787IMS8#PBF | MSOP | 8 | I | $3.15 | $2.75 |
| LT1787IMS8#TRPBF | MSOP | 8 | I | $2.81 | |
| LT1787IS8#PBF | SO | 8 | I | $2.95 | $2.55 |
| LT1787IS8#TRPBF | SO | 8 | I | $2.61 | |
| LT1787CS8 | SO | 8 | C | $4.80 | $4.10 |
| LT1787CS8#TR | SO | 8 | C | $4.22 | |
| LT1787HVCS8 | SO | 8 | C | $6.70 | $5.80 |
| LT1787HVCS8#TR | SO | 8 | C | $5.92 | |
| LT1787HVIS8 | SO | 8 | I | $7.90 | $6.90 |
| LT1787HVIS8#TR | SO | 8 | I | $7.02 | |
| LT1787IS8 | SO | 8 | I | $5.90 | $5.10 |
| LT1787IS8#TR | SO | 8 | I | $5.22 | |
| LT1787HVIMS8 | MSOP | 8 | I | $8.90 | $7.70 |
| LT1787IMS8#TR | MSOP | 8 | I | $5.62 | |
| LT1787HVIMS8#TR | MSOP | 8 | I | $7.82 | |
| LT1787CMS8#TR | MSOP | 8 | C | $4.62 | |
| LT1787IMS8 | MSOP | 8 | I | $6.30 | $5.50 |
| LT1787HVCMS8 | MSOP | 8 | C | $7.10 | $6.10 |
| LT1787HVCMS8#TR | MSOP | 8 | C | $6.22 | |
| LT1787CMS8 | MSOP | 8 | C | $5.20 | $4.50 |
| LT1787HS8 | SO | 8 | H | $6.40 | $5.40 |
| LT1787HS8#TR | SO | 8 | H | $5.50 | |
| LT1787HVHS8 | SO | 8 | H | $8.20 | $7.20 |
| LT1787HVHS8#TR | SO | 8 | H | $7.30 |
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 |
|---|---|---|---|
| DC907A-B | LTC6102, LT6100, LT1787, LTC2054, and LTC2439-1 (Requires DC590B) | Demo Board | $150.00 |
Companion Boards
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC590B | Isolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards | $50.00 |