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1. Describe
LT®1990 is a micropower precision differential amplifier with a very high common-mode input voltage range. it It has 1 or 10 pin selectable gain. LT1990ACS8#PBF operation Within ±15V of ±250V common mode voltage range supply. The input is fault-protected and protected from public Mode voltage transients and differentials up to ±350V The voltage is up to ±500V. LT1990 is very suitable High-end and low-end current or voltage monitoring. On a single 5V power supply, the LT1990 has an adjustable 85V Input range, 70dB minimum CMRR and consumption less than 120µA Power supply current. Rail-to-rail output maximizes dynamic range, which is especially important for single power supplies because As low as 2.7V. The rated voltage of LT1990 is 3V, 5V and ±15V Supplied at commercial and industrial temperatures Scope. The LT1990 is available in an 8-pin SO package.
2. Feature
1. Pin selectable gain is 1 or 10
2. High common mode voltage range: 85V window (VS = 5V, 0V) ±250V (VS = ±15V)
3. Common mode rejection ratio: 70dB minimum
4. Up to ±350V input protection
5. Gain error: 0.28% Max
6. PSRR: 82dB minimum
7. High input impedance: 2MΩ differential, 500kΩ common mode
8. Micro power consumption: 120µA maximum power supply current
9. Wide power supply range: 2.7V to 36V
10. –3dB bandwidth: 100kHz
11. Rail-to-rail output
12. 8-pin SO package
3. Application
1. Battery cell voltage monitoring
2. High voltage current detection
3. Signal acquisition in noisy environment
4. Input protection
5. Fail-safe front end
6. Liquid level sensing
7. Isolation
4. Pin configuration
5. Primary Features
LT1990 is a complete gain module solution, suitable for high Input common mode voltage application, including a Low-power precision operational amplifier provides rail-to-rail output swing and on-chip precision film High precision resistance. On-chip resistance Form a modified differential amplifier, including a reference Port used to introduce offset or other additional waveforms. Use pin-strapping alone, unity gain or gain of 10 High-precision production. The resistance network is Designed to generate an internal common mode voltage divider of 27 to provide a very large input range Compared with the power supply voltage used LT1990 itself. LT1990 is very suitable for the following situations Where relatively small signals need to be extracted High voltage circuits, like many electric currents For example, monitoring instrument applications. with Able to accept input voltages far beyond the range The limit of the local power rail and its greater than 1MΩ Input impedance, develop precise and low power consumption LT1990 single chip greatly simplifies top and bottom instrument design Solutions for traditional discrete implementations.
6. Package overview
