Other Parts Discussed in Thread: CODELOADER
i 'm trying to follow the user guide and i got the PLL to lock but it seems there is no output in any of the CLKoutX.
i checked the OSCout and i got output,
Thanks in advance.
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i 'm trying to follow the user guide and i got the PLL to lock but it seems there is no output in any of the CLKoutX.
i checked the OSCout and i got output,
Thanks in advance.
I changed the "SYNC_POL_INV" bit and it worked, i can see the signal in output now, but it seems to be offset by a few khz.
I checked the crystal and the signal generator and they are not the problem, any suggestion?
I changed my CLKin1 configuration to match the default mode and amplified the signal, after pll led illuminated green the output stabilized.
i saw only dual inputs in the mode menu(counting clkin and vcxo), is it possible to work only with one input of 100mhz instead? i'm working with codeloader4
thank you for the help
Yes, the EVM need be modified in hardware firstly.
1, Power down VCXO.
--- Open power supply bead R18.
2, Select OSCin* SMA connector for 100 MHz reference input
--- Move C4 0.1uF to R1
Now for LMK0480x, VCXO frequency = 100 MHz.
Then LMK0480x can work in PLL2 only mode.
Using software "Clock Design Tool" to simulate VCO frequency, Loop filter parameters, dividers.
Set simulation result into GUI "Codeloader".
Regards,
Shawn