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DSP 28335 如何分压0~5V变成0~3V让ADC读取



我想利用28335上的DSP去读取current sensor的输出,但是输出电压是0~5V

所以打算利用分压,但是查了资料,发现要注意阻抗,但是还是不太懂

www.ti.com.cn/.../tms320f28335.pdf

查了文件的171页,28335的ADC输入阻抗是1K

这样分压的电阻要怎麽选?