Analog Devices has released a set of differential-in differential-out amplifiers win a minimum CMRR (common-mode rejection ratio) of 94dB. Based on the existing LTC6363 differential amplifier which needs external resistors, they have built-in matched resistors. “Resistor matching is equivalent to a 0.002%. Initial gain accuracy is 45ppm maximum and varies by only 0.5ppm/°C maximum over temperature,” ...
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