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INA271SHKJ 使用求助

Other Parts Discussed in Thread: INA271, INA271-HT

使用 INA271SHKJ 采集电流信号,当信号为 100mA x 1Ω = 100mV 时,室温下输出 1.973V,此时用手指按住 INA271 芯片顶部给其加温,输出增加至 2.2v 左右。如果放入高温箱,从室温加温至 150 ℃,输出甚至会在 1.6V 到 2.5V 之间的范围,严重超出器件的性能指标,尝试断开输出所连的后部电路,问题未改善。工作状况为:INA271 供电电压 3.3V, 3、4 脚对地连接 0.1uF X7R 陶瓷电容,采集电阻 1Ω,采集电流 20~100mA。