Other Parts Discussed in Thread: FDC2212
- One of my customer is using FDC2112 to detect the change of capacitance between 5pF~20pF with a resolution requirement of at least 0.2 pF per bit. But the actual resolution in their application is only about 1pF. They have already set the gain to the maximum value 16 and do u have any other advice about how to improve the resolution? The circuit they are using is the typical application as attached.
- Actually I don't know about the device very well and in my opinion, the resolution of FD2112 is about 250/2^12/16=3.8nF. Is it right? So I am very confused about the correct way to calculate the resolution.
- The customer also found that if they decrease the capacitance of C from 33pF to 16 pF and the resolution has increased. Could u tell me the reason and what is the minimum capacitance of C ?