AFE7950EVM: AFE7950EVM

Vitor Cristina

Part Number: AFE7950EVM

Tool/software:

Hello, I am using an AFE7950EVM and I want to know more information about the python library for the scripts that we run on this board. I am trying to understand for example what this definition do: sysParams.ncoFreqMode= "1KHz"

I am also trying to figure out how your borad works in terms of TX and RX frequencies. It seems that you have an Fdac of 8847.36 Mhz defined in the scripts to and the TXNCO0 frequencies are also defined there. How does this work in terms of final TX frequency? When we test it seems that the TX final frequency is the Fdac+FTXNCO0, is this okay? This is, if i want to transmit and receive at 9.6Ghz I have to define the TX and RX NCO frequencies at 754Mhz?

Thank you

over 1 year ago

0 David Chaparro over 1 year ago

TI__Mastermind 18791 points

Hi Vitor,

For details on these parameters I recommend referencing the following two documents:

AFE79xx_Configuration_Parameters.pdf
Latte User's Guide

In regards to your output frequency question, the Tx output freuencies are dependent on the NCO frequency and the baseband frequency, sent from the FPGA. If the FPGA is sending a baseband tone of 10Mhz and the NCO is at 9.6GHz the final output would be 9.61GHz. Please note that the DAC only supports operation in the 1st and 2nd Nyquist zones so if you plan to operate at 9.6GHz I recommend changing your DAC sample rate to 12GHz, 11.79648Gsps if using on the EVMs on board crystal.

Regards,

David Chaparro