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TMS320F28035: F28035 ADC 采样值问题

Part Number: TMS320F28035

Hi,

 当我把"SW_AD1"接到F28035 B3的ADC采样口时发现,

"SW_AD1"对GND的电压为3.28V,实际ADC采样出来的值只有2.8V左右。

当我把R109 = 10K,改为1K,"SW_AD1"对GND的电压也为3.28V,ADC采集出来的电压就和实际值很接近3.28V,

为什么和上拉的电阻值有关?