• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 11 subscribers
  • Views 331 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

AFE7900: Pmax_Fs value for c band 5.4 GHz - 5.9GHz at 10GSPS sampling

Fimmy Joy
Prodigy 60 points
Part Number: AFE7900

Dear Sir/Madam,

In the datasheet of AFE7900, reference 7.5 Transmitter Electrical Characteristics for DAC , parameter Pmax_FS has test conditions only till fout = 4900MHz, fDAC=8847.36MSPS,-0.5dBFS, straight mode .

We are working in c band frequency range from 5.4GHz to 5.9GHz at FDAC value of 10 GSPS . Hence, we would wish to know  Pmax_FS paramater typical value in mentioned frequency and sampling rate.

Kindly help to resolve this issue .

Thanks & Regards,
Fimmy Joy

  • 0
    TI__Expert 5035 points

    Hi Fimmy,

    Sorry for the delay. I will reach out to the validations team to see if there is any data with your conditions.

    In the meantime, in the datasheet section 6.12.13 figure 6-504 has the TX full scale vs RF frequency for the different channels at 8847.36MSPS, Mix Mode, 2nd Nyquist Zone for 4.3GHz to 5.5GHz. In that plot you could see a full scale value that should be close to the one for your conditions. Since you are looking at 10GSPS the full scale value might be a little lower than the 8847.36MSPS plot.

    Best

    Camilo

  • 0 in reply to Camilo Garcia Trujillo
    TI__Expert 5035 points

    Hi Fimmy,

    It seems like there was no extra data that would fit your conditions. I have decided to try this in the AFE7900EVM by using Fdac = 10GSPS in straight mode with interpolation by 20. Please see the table below for the results.

    I was using TXA which has a matching network appropriate for the band and have substracted the cable loss from the measurements. I set the DAC input to a scaling of 0.891251 which is equivalent to -1dBFS.

    Output Freq (MHz) Power without cable loss (dBm)
    5410 -6.699
    5510 -7.102
    5610 -7.147
    5710 -7.09
    5810 -7.788
    5910 -8.296

    Best,

    Camilo