adf4355

Hi,

Do you see SDP connector connected message as given below example? 

Regards,

Kudret

Hi,

Yeah, on my control screen, as on yours.

When i input 4000M and 6000M, the spectrum analyzer shows no change.

As shown in the figure below.

Hi,

Yeah, On my control screen, it's the same as yours.

When i input 6000M and 4000M, that's what the spectrum shows.

Hi,

First of all, I want to make sure SPI communication is okay. Can you select the MUXOUT pin output from Register 4 as Dvdd and write to the Register 4. LED that is connected to MUXOUT should turn-on. IF not, there might be a problem with the SDP-S connector. 

Kudret

Hi,

I did as you said, and when i input Dvdd in MUXOUT, the LED is on. So it's probably not a connection problem.

Zsq

Thanks. 

Can you also probe the crystal oscillator output to see if there is 122.88 MHz output?

Kudret

Hi,

The adf4355 has only two outlets, A and B. How can I probe the crystal oscillator's 122.88MHZ output?

Do I output 122.8MHZ directly at the VCOout？

Zsq

You can connect an oscilloscope probe to TP1 or TP2; or an SMA cable to REFINA or REFINB connectors to check the output of crystal.

Kudret

Hi,

I did as you said, I use an SMA cable to REFINA, I can get a signal of about 122.4Mhz.

As shown in the figure below.

Is there any modification on your board? Can you verify all the below components are assembled on the board? 

Kudret