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FDC2212: ENOB and conversion time

Amy Luo
Expert 6895 points
Part Number: FDC2212

Hi team,

There is a description on page 17 of FDC2212 datasheet:”The reference count value must be chosen to support the required number of effective bits (ENOB). For example, if an ENOB of 13 bits is required, then a minimum conversion time of 213 = 8192 clock cycles is required.”

I don't understand why the relationship between ENOB and conversion time is like this. Can anyone help me understand it?

Thanks
Amy Luo

  • 0
    TI__Expert 3435 points

    Hi,

    You can think of the reference count as the sampling rate. The sampling time can be set by the reference count, RCOUNT_CHx. The RCOUNT value multiplied by 16 is the number of reference clock cycles, which will determine the ENOB. Please check out the text above Table 6 in the datasheet.

    Regards

    Sharath.