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关于INA282的偏移

Other Parts Discussed in Thread: INA282, INA240

为什么将INA282的IN+和IN-短接,输出偏移都有9mV~12.5mV(每个片子实测不一样,集中在10mV左右)?而且小信号和大信号的放大倍数也不一致,输入端60mV和10mV的放大倍数能差0.5,这个片子真的能胜任高精度的采集工作吗?