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ADC输入阻抗的问题

Other Parts Discussed in Thread: CC2540

cc2540的adc输入阻抗为多大?

我用电阻分压测量电源电压,当用两个100k分压时,读到的adc数据不准确,而当用两个1k的小电阻分压测量时,则比较准确,这是与adc的输入阻抗有关系吧?