I've recently bought the evaluation board of the AD4360-9 PLL chip. I have installed the software as recommanded by the application note and I have tried to make it works. I have used the same parameters displayed on the user guide page 8.
On the oscilloscope I see :
- the REFin signal is 19.2 MHz as expected.
- the RFout and RFout/ signals are both 360MHz as expected but not synchronized when the oscilloscope is trigged on the REFin signal.
- the MUXout (A/2 divider selected) is 90 MHz (as expected too) not synchronized either.
- the MUXout (R divider output) is 1.6MHz (as expected) but not stable and not synchronized with the REFin signal - like it jumps from one period to the other.
Though, the sync LED is ON and lock detect signal is HIGH level - which would mean that the PLL is locked. I would have expected to see all the previous mentionned signals to be synchronized.
I have also checked the value of the N and R latches which are OK and coherent with the different frequency inside the PLL.
I finally checked all power supplies which are all good and that RFout and RFout/ are terminated with 50 ohms.
The PLL has all theoritical inputs to be locked, it is shown as locked by the LED and the lock-detect signal but none of the intermediate and output signals are synchronized with the RFin input.
Thanks a lot for your help.