LT1787 - Precision, High Side Current Sense Amplifiers
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.
Features
Typical Application  | Applications
Packaging  |
| Part Number | Package | Temp | Price(1-99) | Price (1k)* |
|---|---|---|---|---|
| LT1787CMS8#PBF | MS-8 | C | $2.60 | $2.25 |
| LT1787CMS8#TRPBF | MS-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 | MS-8 | C | $3.55 | $3.05 |
| LT1787HVCMS8#TRPBF | MS-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 | MS-8 | I | $4.45 | $3.85 |
| LT1787HVIMS8#TRPBF | MS-8 | I | $3.91 | |
| LT1787HVIS8#PBF | SO-8 | I | $3.95 | $3.45 |
| LT1787HVIS8#TRPBF | SO-8 | I | $3.51 | |
| LT1787IMS8#PBF | MS-8 | I | $3.15 | $2.75 |
| LT1787IMS8#TRPBF | MS-8 | I | $2.81 | |
| LT1787IS8#PBF | SO-8 | I | $2.95 | $2.55 |
| LT1787IS8#TRPBF | SO-8 | I | $2.61 |
Demo Boards
| Part Number | Description | Price |
|---|---|---|
| DC907A-B | LTC6102, LT6100, LT1787, LTC2054, and LTC2439-1 (Requires DC590B) | Demo Board | $150.00 |
| Part Number | Description | Price |
|---|---|---|
| DC590B | Isolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards | $50.00 |
- AN105 - Current Sense Circuit Collection
- DN227 - Sense Milliamps to Kiloamps and Digitize to 12 Bits
- R334 Reliability Data
- Precision High Side Current Sense Amplifiers
- Sep 1999 Four New Amplifiers Serve Many Applications
- Sep 1999 Micropower, Precision Current Sense Amplifier Operates from 2.5V to 60V
- LT1787 Footprints and Symbols
- LT1787 Demo Circuit - Bidirectional Current Sense Amplifier with Offset Bipolar Output
