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求教---采样开始时存在脉冲

Other Parts Discussed in Thread: ADS1254

不知道大家遇见过这种情况没:开启直流采样点,立即打开AD进行转换,采集到的前面的数会是一个脉冲(下降-上升-下降-平稳的变化过程),而且采样点电压越大时脉冲越大。但是,如果我开启直流采样点,等待足够长的时间再开启AD采样,得到的数据就比较平稳。用示波器抓波形时观察边沿处完全看不出有脉冲信号,我一直搞不明白这边沿是怎么形成的??(无法上传图片,请谅解)

我用的芯片是ADS1254。。。