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ADS54J60,1G采样的芯片底噪问题

Other Parts Discussed in Thread: ADS54J60, LMH6401

我自己设计了一块ADS54J60的数据采集卡,不知道为什么底噪只有-90dbFS,我看芯片手册上都是-159dbfs,不知道是什么原因导致的,还有怎样可以提高采集卡的底噪呀?