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ADS1258: 使用内部16M时钟时动态性能变差

Part Number: ADS1258


使用1258的评估板测试1KHz  满幅输入的正弦信号时,发现动态性能很差,和手册上给的频谱图相差较多,但是用外灌时钟时,动态性能明显变好,请问这个原因是什么呢?