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ADF4350 programming

Question asked by lucas on Apr 12, 2011
Latest reply on Apr 26, 2011 by lucas

Hi to all, I'm playing with my own software for ADF4350 and I'd like to know if after first initialization of registers R5, R4, R3, R2, R1 and R0 to generate new frequency, for example, it's correct to update only R4 for new RFDIV,  R1 and R0 for MOD, FRAC and INT?

ADF4350 programming sw, usually, light UPDATE All.

My question is because actually I get strange behaviur from my circuit: frequency is around requested, but It's moving from right to left, without lock, no LD led on. I'm using 10Mhz of REF, multiply to get 20Mhz of PFD, that I can measure on MUX pin. This could be mean a right registers programming.

Do you have an advice for me?

Thanks a lot

ADF4350 loop filter.bmp