±250V Input Range, 100kHz, G =10, Micropower, Difference Amplifier

The LT®1990-10 is a micropower precision difference amplifier with a very high common mode input voltage range, a fixed gain of 10 and 100kHz bandwidth. The LT1990-0 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 LT1990-10 is ideally suited for both high side and low side current or voltage monitoring.

On a single 5V supply, the LT1990-10 has an adjustable 85V input range, 60dB min CMRR and draws less than 180µA supply current. The rail-to-rail output maximizes the dynamic range, especially important for single supplies as low as 2.7V.

The LT1990-10 is specified for single 3V, 5V and ±15V supplies over the industrial temperature range.

The LT1990-10 is available in the 8-pin SO and pin FMEA compatible MSOP packages.

Applications

* Battery Cell Voltage Monitoring

* High Voltage Current Sensing

* Signal Acquisition in Noisy Environments

* Input Protection

* Fault Protected Front Ends

* Level Sensing

* Isolation

* Gain = 10* –3dB Bandwidth = 100kHz* High Common Mode Voltage Range:

* ±250V (VS = ±15V)* 85V Window (VS = 5V, 0V)

* Common Mode Rejection Ratio: 60dB Min* Input Protection to ±350V* Gain Error: 0.8% Max