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TMS320F2812AD采样问题,AD口接地,采样值出现大幅值跳变

如图:

AD口已经被直接短到地上了,采样数据采用DA芯片打印,用示波器观察DA输出的AD采样值;

有两个特点:

1、0V的采样波形非常烂

2、会不定期的出现很大幅值的尖峰,基本排除DA乱打印的情况,请教一下各位高手,这是咋回事。