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直流电压的智能测量

Other Parts Discussed in Thread: TS5A12301E, PGA281

想做一个可以智能测直流电压的装置。量程0-220v.本打算利用电阻分压来做0-4v,4-40v,40v-220v这三档。可是遇到了问题:1模拟开关导通时存在电阻,关断时也有电阻;2模拟开关的输入电压一般比较低(如:TS5A12301E最大电压为6.5v)。

想请大家帮忙指导指导,当然了其他方法也可以给我讲解讲解呢。谢谢。