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ADS58J89EVM: Unable to connect TSW14J56 to ADS58J89

Part Number: ADS58J89EVM
Other Parts Discussed in Thread: ADS58J89

Unable to successfully connect a ADS58J89 to TSW14J56 Rev E.

I have a ADS32RF45EVM and can connect with this same TSW14J56.

I tried loading the evaluation file without success.

I used the ADS58J88_500M_442.cfg for the J89 EVM.

On the J89 I have D1 and D4 as well D10.  D3 did NOT illuminate so no SYNC.

I also checked that both EVMs had good clean 5V,3A supplies.

I loaded the ADS58Jx_LMF_442 on theRF45 EVM

I set the ADC output data rate to 250M

Results were unable to communicate.  "Read DDR to file timeout error..."

Suggestions?

Thank you for your assistance in advance.

  • Hi Matthew,

    We are looking into this and will provide an update in a latter post.

    Thanks,
    Eben.
  • Hi Matthew,

    Before loading the configuration file to ADC, do you reset the ADC by pressing switch SW1 on the ADC EVM? This is always recommended for the ADC to work properly.

    Thanks,
    Eben.
  • Thanks for the reply Eben. I did follow the procedure for resetting the ADC before proceeding.

    I have played around today with the setup and have been able to get the two to communicate. However, there seems to be an issue with the configuration as I had to change the "L" setting in dynamic configuration to get the JESD path working. It was "4" after loading the configs mentioned below, but I had to Use "2" for it to capture.

    I used the following two configuration files:

    For the ADS58J89, Under Low Level View, I loaded the following config file: ADS58J88_500M_442.cfg
    For the TSW14J56, In HSDCPro, I used the following config file: ADS58Jx_LMF_442

    I was very excited to get this to work. I have been using a Agilent E4421B signal gen as a reference measurement signal: 50MHz @ 0dBm. However, when I looked at the Real FFT window for the proper value, I was seeing 50MHz @ ~-85dB. Also multiple odd and even harmonics.

    Any suggestions?

    Also, do you have config files that I might try to use other that those provide with the GUIs that I might try?

    Finally, could you please add Farnaz Foroughian to the reply? email is fforoug1@vols.utk.edu

    Kind Regards,

    Matthew
  • Has there been any progress on this issue? I was wondering if there were some additional configuration files that I might try to resolve this issue. Please let me know if there are alternatives to those provided with the GUI install.
  • Hi Matthew,

    Update the HSDCPRO ini file to the one attached to this post. The issue was that the interface name in the original ini file was not pointing to the correct firmware.

    Thanks,

    Eben.

    ADS58J89_LMF_442.ini

  • OK. I can now connect the two boards, but when I add a reference signal at 0.5Vpp, its magnitude in HSDCPro is showing a much lower value (-80dBFs). I have made sure that the reference voltage to the ADC is the default (In this case the 1.25V in the configuration GUI is fine) and that the magnitude of my test signal doesn't exceed the full scale amplitude. However, when I use a 0.5Vpp signal as input at 50MHz while using a 250Msps rate, I am getting something like -80dBFs @ 50MHz. This "offset" can be found on all 4 channels. As a secondary test, I halved the voltage to the channel(s) and found that 2 out of the 4 channels showed the proper 6dB delta reduction. It should be noted that the I am using nearly 1M samples and that my noise floor is ~-115dBFs. Any suggestions as to why the magnitude would be this far off?
  • Hi Matthew,

    Can you try disabling or changing the decimation filter setting on both paths AB and CD to "Low Pass". You can change this from ADS58J88-->ADC Configuration tab

    Thanks,
    Eben.
  • Eben,

    Yes. This worked! Thank you very much for your assistance in getting me to this point. I am now seeing something very close to the correct frequency/magnitude that I was expecting. Could you please provide additional information/detail as to why this needed to be done and also how the filter might also be used?
  • Hi Matthew,

    Check section 7.3, Figure 39 of datasheet for a description of the signal path inside the ADC.

    Thanks,
    Eben.