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我现在的AD输入最大接收的负电压是-0.2V，实际使用时输入会出现负电压（大概可以到-3v），但我不需要对这个负电压转化，请问输入端该如何处理啊
，保证芯片不给搞坏？简单的二极管钳位好像只能固定到-0.7V啊
可不可以在信号输入端加入3V偏置电压
