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DSD 群延迟问题

Other Parts Discussed in Thread: PCM1792A

PCM1792a的群延迟为55/fs(shark rolloff)、18/fs(slow rolloff),192KHz对应的群延迟为55/(192*1000)=286μs。如果采用DSD模式,采样率为2.8MHz,群延迟是不是变为55/(2.8M)?另外采用DSD模式有什么要求吗或者DSD的接口有没有特殊要求?