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INA240: 零输入时输出跳动过大

Part Number: INA240


  我使用的INA240A2PWR芯片做电机控制的相电流采样,当把IN+和IN-短接,并短接到GND,使用ADC采样时仍然检测到OUT有25个LSB的跳动,把OUT从ADC输入断开,ADC没有跳动,证明非电路链路问题。

  请问这个现象是否正常,是否有相关测试数据,或者我该如何进一步验证排除问题点。