RG=15,几mv信号输入,低温下(-20)发现INA163输入端有3v左右信号,输出不对,更换ina163后正常,多次实验发现出现相同情况,换了4,5个ina163
可能是什么原因?
怀疑是低温试Rg阻值减小,但是能使芯片损坏吗?还是有可能芯片买到残次品,低温性能不佳?
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