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TLV6002零点飘移问题

Other Parts Discussed in Thread: TLV6002

      TLV6002在做信号放大时,3.3v供电,使用100倍放大加跟随器放大设计。当输入端短路时,不同芯片ADC2处会有0~50mv输出,此时的正向零飘还能够使用软件校准。但是一些TLV6002会出现负零点漂移现象,例如输入0~0.8mv时,输出端ADC2处一直是0V,只有输入电压大于0.8mv是,ADC2处才有输出,并且ADC2处的输出=(输入-0.8mv)*100 。请问芯片的负零点飘移是正常现象还是电路设计问题?有什么方法可以解决TLV6002的负零点飘移?