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

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.

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 Typical Application

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

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