Tool/software:
According to data sheet chapter 8.4.5 START and STOP Edge Polarity, it is strongly recommended to select the same Start and Stop Edge Polarity. The reason is given with symmetry shift. Thank you that there is a reference to this in the data sheet. In our hardware design, we want to tap the start signal at the driver stage. Unfortunately, the polarity is such that we have to trigger on negative edges and the start pulses are not inverted, i.e. on positive edges.
Now I need to know how strong the inaccuracy is. Is it coming from the TDC7200 or from the applied signal. We do not need the full resolution and clock the TDC7200 with 8MHz. If we have 1ns blurring this would not be a problem for our application. If the inaccuracy is caused solely by the different falling/rising edge signal shape, I can measure this in the prototype and make an estimate. Can you please tell me if this is the only influence or if there are TDC7200 internal effects that contribute to the inaccuracy? Thank you very much
