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请教F28335的ADC精度问题。



我用F28335的ADC时,按照数据手册说明,外接20K电阻和两个2.2uf电容,电源之间采用4N7磁珠隔离,给定固定输入,测得的采样值最后3位都在波动,这应该不正常吧?请问可能原因是什么?F28335的ADC的精度实际可以达到几位?