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采样频率高以后采样值很不稳定(不精确)是什么原因

将9个正弦波送到F28379D的9个ADC io口,即每个采样周期需要采9个波形,现在使用两个采样周期进行采样,观察其中一路的采样得到的波形,如图蓝色波形为设置adc采样周期40us采样出来的波形。桔黄色为采样周期100us采样采出来的波形,发现采样周期100us采出来的波形与原波形较为贴近,而40us采出来的波形纹波很大,这是什么原因呢?