We'll be using the PLL for the first time in a product, out of necessity (the micro only allows a crystal up to 8MHz, but we need a 32MHz clock). The PLL will also be clocking a CAN module within the microcontroller.
I'd be grateful for insight into any of the following questions:
a)How do long do PLL's take to start?
b)Do PLL's ever fail to start?
c)If there is more than once choice for a crystal frequency where we can multiply it up to 32MHz (for example, 8Mhz x 4 = 32MHz, but 4MHz x 8 = 32MHz also), what are the best choices?
d)Is there anything to watch out for in the hardware or software design (any gotchas)?
e)Is there anything we can do to make the system as robust and stable as possible (i.e. decrease the probability of a PLL unlock)?
f)Can anyone recommend any books or technical papers they've found useful?
Thanks for the help, Dave Ashley.