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我看到datasheet上写的LINEIN部分里有Active and passive filters for the two channels prevent high frequencies from folding back into the audio band这句话，在LINEOUT部分里有The DAC is connected to the line outputs via a low-pass filter that removes out-of-band components. No further external filtering is required in most applications.因此想确认一下是不是芯片内部模拟通道都有滤波器了，有的话滤波器响应是怎么样的？还需要自己再加滤波器吗？
