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这样做滑动电阻的精确测量行吗?

Other Parts Discussed in Thread: TL431

我想要尽可能的精确测量一个滑动电阻,就12位的AD测量。MCU自带的AD.先不考虑这电阻的精度,先考虑电路上的因素。

我想这样做可不可行?

1.用恒流源给这滑动电阻供电,这样这个电阻不会受到电源的影响从而影响精度了。

2 用TL431给AD做一个基准电压。

可行吗?有没有这样恒输出的IC?

谢谢!