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aic3106芯片录音直流偏移问题



dm814X evm板,音频使用aic3106芯片,把一些输入通道配置成single-ended后,录音有较大的直流偏移,偏移样点值在760~2400,跟模拟增益大小有关,而配成全差分时偏移只有-20,同时单端噪声相对于全差分也大5~10db,请问有没有什么方法把直流偏移降下来,最好能同时减小噪声,谢谢了。