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请教PCM1794 的 IREF 的问题

Other Parts Discussed in Thread: PCM1794

 因为datasheet 里面没有说明。请教专家:PCM1794  20pin  ;21pin ;22pin   的选择条件是什么?

我现在将IREF 更改成为5K,对DAC输出有什么影响?VCOM pin电容值选择依据是?

还请解答,谢谢 ,如果有文献资料还请麻烦给个连接。