The DAC pass_band  filter response is over 20Khz( in figure 10), while the DAC  stop_band filter response is only over 2Khz(in figure 11) , who wants tell me why the gap is so large?

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•      Hello,

Evidently this is a typo in the datasheet.  Figure 11 intends to show the filter's response above the audio range, so its 0 -- 20 KHz axis is in error.  For example, it would make more sense if drawn like this:

The important fact is, the filter is more than enough for its job.  Thanks to this DAC reconstruction filter, all we need after the DAC is a simple RC filter specified in the datasheet.

Best regards,

Bob