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关于TMS320F28035的AD采样干扰问题求助

Other Parts Discussed in Thread: TMS320F28035

TMS320F28035使用AD端口依次采样四路电压,竟然会出现第一路影响第二路、二影响三、三影响四,而反过来却不影响的奇怪现象。请问,这是什么原因?我采样电压都是在CLA里完成的,触发源分别为ePWM1、ePWM2、ePWM3、ePWM4。求高手解答,为什么会出现这种采样干扰情况?