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Is LSB of TDC7200 TOF related or not?

Other Parts Discussed in Thread: TDC7200

Hi,

I have two question about TDC7200.

(1) In datasheet of TDC7200, the LSB resolution is 55 ps

The LSB is calculated when force calibration is on, so can I assume that LSB is Gaussian distributed with average = 55 ps?

(2) 

Figure 17 shows the standard deviation increases with longer TOF, is this caused by worse LSB distribution with longer TOF or something else?

Regards,

Eric