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万用表芯片ICL7106

 你好,咨询下ICL7106的IN管脚输入电压范围,根据手册,范围为几V。 但是根据图示电阻档防护电路,220V输入的时候只保护了Vref,给Vref做了稳压,为什么不保护IN+,IN+为什么只串联一个大电阻,IN+可以输入220V吗?