It's a custom board. No matter how I change the registers, the output is not working good. I tried bypassing the auto-calibration, but nothing happened. What should I do to make it work?
Hi,
I don't see a major problem here, I tried your REFIN and RFOUT with the EVAL software and it works well.
my suggestions are :
1- check the loop filter, I used a 40 kHz loop filter with a good phase margin ( above 45 degrees).
2- check the sequences, powering and register sequence could be critical, I did not use your ADC frequency but it should be enough.
3- use " write int. seq" instead of " write freq. update seq.", when using the EVAL, sometimes the sequence of updating the parameters could cause errors.
do you always see an unlock for these settings or does it happen sometimes? Have you tried different pfd freq using the same REFIN?
here are my settings:
R13: 0xD
R12: 0x15FC
R11: 0x61200B
R10: 0xC00FBA
R9: 0x100ABCC9
R8: 0x15596568
R7: 0x60000E7
R6: 0x354140F6
R5: 0x800025
R4: 0x30028B84
R3: 0x3
R2: 0x8F02712
R1: 0x1134041
R0: 0x200FC0
Regards,
Burhan
