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FDC2x1x 参考频率的选择

Other Parts Discussed in Thread: FDC2214, FDC2212, FDC2114, FDC2112

要实现快速的液面检测的功能,探针电容会在接触液面时增大1pf左右,之前是用的基于PLL的方式,现在想换成FDC2x1x来检测,想请教下这个12bit采样的范围是怎样的?因为手册上说输出的是Fsensor/Fref的比值,Fsensor最大值是10MHz,但是Fref是个很大的范围,2-40MHz且还可以进行内部分频,如何换算成对应电容值或者Fsensor的分辨率呢?