用此隔离运放采集400V左右电压，前端用电阻将分压到输入口为合适电压范围，隔离运放为差分输出。后面不想再加一级运放，这样既增加成本又损失精度。输出差分电压可不可以用单片机的两个AD口直接采集。采样结果相减。datasheet首页里的图描述为供电电压为3.3V时，差分电压以1.29V为基准，这样理解不知道是否有误。
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