AnsweredAssumed Answered

AD9364 external reference, RFPLLs are not locked

Question asked by Losev_Egor on Apr 22, 2015
Latest reply on Apr 23, 2015 by tlili

Greetings.

 

I'm using AD9364 on my own board and its No-OS drivers. Reference signal - rectangular pulses, 10MHz, 1.3 Vp-p (I also used 900mVp-p). When I try to init the AD9364, I can see that RFPLLs are not locked. I tried to multiply my reference clk in AD9364 (by setting ref scale, Rx path and Tx path dividers), but it doesn't take effect.

I have some questions. Can I use the rectangular pulses as reference clk? How the AD9364 perceive those pulses?

I put ref_clk to out_clk, and when I watch the signal "out_clk", it is not rectangular pulses.

 

When I used sine wave (for test) as reference clock, RFPLLs were locked correctly. But, to be honest, I didn't watch the "out_clk".

 

Help me, please.

 

P.S. Sorry for my bad English.

Outcomes