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AMC1200替换HCPL7840的问题

Other Parts Discussed in Thread: AMC1200

你好,我们现在准备使用AMC1200替换HCPL7840,请参考下面的电路,AMC1200的输入为200mv左右

当吧HCPL7840换成AMC1200后,发现下面电路中MCU的AVCC_3V3的供电会被抬高到4.25v,如果换会HCPL7840输出正常。

请问我的电路是否有问题?哪里需要改进?谢谢!