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TMS320F28035 ADC上拉检测问题

Other Parts Discussed in Thread: TMS320F28035

TI工程师:

您好,我现在使用TMS320F28035 ADC上拉电阻碰到如下问题:

接上拉电阻10K到VCC3.3V,接到ADC IO脚采样,发现10块样板中有两块出现检测值2V左右,也就是10K采样电阻压差超过1V,其他8块板子是接近3.3V,请问造成检测值2V的原因可能是什么,算正常吗?多谢