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LT6375 - ±270V Common Mode Voltage Difference Amplifier

The LT®6375 is a unity-gain difference amplifier which combines excellent DC precision, a very high input common mode range and a wide supply voltage range. It includes a precision op amp and a highly-matched thin film resistor network. It features excellent CMRR, extremely low gain error and extremely low gain drift.

Comparing the LT6375 to existing difference amplifiers with high common mode voltage range, the selectable resistor divider ratios of the LT6375 offer superior system performance by allowing the user to achieve maximum SNR, precision and speed for a specific input common mode voltage range.

The op amp at the core of the LT6375 has Over-The-Top® protected inputs which allow for robust operation in environments with unpredictable voltage conditions. See the Applications Information section for more details.

The LT6375 is specified over the –40°C to 125°C temperature range and is available in space-saving MSOP16 and DFN14 packages.

Features ±270V Common Mode Voltage Range 97dB Minimum CMRR (LT6375A) 0.0035% (35ppm) Maximum Gain Error (LT6375A) 1ppm/°C Maximum Gain Error Drift 2ppm Maximum Gain Nonlinearity Wide Supply Voltage Range: 3.3V to 50V Rail-to-Rail Output 350μA Supply Current Selectable Internal Resistor Divider Ratio 300μV Maximum Offset Voltage (LT6375A) 575kHz –3dB Bandwidth (Resistor Divider = 7) 375kHz –3dB Bandwidth (Resistor Divider = 20) –40°C to 125°C Specified Temperature Range Low Power Shutdown: 20μA (DFN Package Only) Space-Saving MSOP and DFN Packages Typical Application

Applications High Side or Low Side Current Sensing Bidirectional Wide Common Mode Range Current Sensing High Voltage to Low Voltage Level Translation Precision Difference Amplifier Industrial Data-Acquisition Front-Ends Replacement for Isolation Circuits Packaging

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