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INA148单电源供电测得电压有误差

Other Parts Discussed in Thread: INA148

使用INA148放大一个3-4V左右的电压,使用正负5V供电测量结果十分准确,但只使用正5V时,会有一定的误差,这是什么问题?我看datasheet上16页的8.2.3 Single-Supply Differential Amplifier,是可以那么用的啊?