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Tool/software:
Hi,
I am trying to achieve a fixed AB/CD delay of 120ns since I have a very low capacitance system and my resonant frequency during AB leg transitions is somewhat high. I've noticed from datasheet graphs (and math) that a fixed delay of less than 250ns does not seem achievable out of the box.
I also know, however, that delays much less than this (down to ~35ns) can be achieved as the ADELAB pin voltage increases with load, depending on the voltage division from CS to that pin. I am wondering if I can exploit this to get a lower fixed delay? I have prototyped in the lab adding a voltage divider off of Vref that sets the ADELAB pin at 0.7V, which seems to get me the 120ns that I want. I'm not sure if this is acceptable for the part, though? Will I damage anything by doing this?
Thanks!
Brian
Yes. It's OK to do so. You can check ref designs like PMP8740. I believe it is what you did too.