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.

  • Resolved

TSW40RF80EVM: ADC32RFxx DDC Configuration

Part Number: TSW40RF80EVM

Hi,

I have a TSW40RF80EVM board that connects to a TSW14J56EVM. I'm particularly interested in using the ADC to see a signal input at 430-MHz at around -20 dBm. I also use TSW40RF8x EVM GUI and High Speed Data Converter Pro software that I got from the website.

I was able to detect signals from as high as 1.96 GHz, but when I go below 940-MHz, I could not see the signal in the HSDC Pro software anymore. I'm wondering if you guys can help me configure both software to be able to detect at frequency of 430-MHz with an ADC Output Data Rate of at least greater than 1 Gsps.

And is there any way to configure the trigger functionality in the HSDC Pro software? Thanks!

Regards,

Daniel

  • Hi,
    With your current configuration, it looks like you can see the ADC output for input around 1.96G, but not when its around 940M. Have you tried changing the NCO in ADC to something close to 940M? Please refer 5.1.1 of the UG (www.ti.com/.../slau706a.pdf)

    Regarding the output data rate >1Gsps, you'll have to configure the ADC in bypass mode (File # 4 or 5 in Tables 1 & 2 of UG).

    Can you elaborate more on the trigger functionality? Do you want to put output one from TSW14J56EVM and then use it to trigger a capture ADC output?
    Regards,
    satish.
  • In reply to Satish Uppathil:

    Where would I change NCO in? The HSDC Pro or the TSW40RF80EVM GUI?

    What do you mean by (File # 4 or 5 in Tables 1 & 2 of UG)? What is UG?
  • In reply to Daniel Saspa:

    UG is user's guide :www.ti.com/.../slau706
    Please section 5.1.1 for changing NCO in ADC. The tables are also in the UG.
  • In reply to Satish Uppathil:

    I found the configs and have used the ADC. How do I use the config files exactly? I cannot find an upload config files option in either GUIs. Thanks

    Satish Uppathil
    UG is user's guide :www.ti.com/.../slau706
    Please section 5.1.1 for changing NCO in ADC. The tables are also in the UG.

  • In reply to Daniel Saspa:

    For the trigger, I would want the ADC to record an impulse signal. I would want the ADC to see that if a signal suddenly appeared on the input of the ADC that the signal would be recorded in the HSDC Pro GUI. Would that be possible?
  • In reply to Daniel Saspa:

    You'll have to use the "open configuration" icon (next to the floppy disk icon) in the "Low Level View" tab of the TSW40RFxx EVM GUI. 

    Please note that HSDC Pro GUI is used for the TSW15J56EVM only.

    Regards,

    satish.

  • In reply to Daniel Saspa:

    This is not possible.
    Regards,
    satish.
  • In reply to Satish Uppathil:

    Satish,

    Thanks for the info. I got some follow-up questions.
    When I went to any of the two bypass configurations, I noticed that ChA input has some spurs on the spectrum @ 214MHz, 522MHz, 952.4MHz, and 1.259MHz.
    Do I just open just the one configuration file (2T2R_RevC_ADC-BypassLMFS82820_18xInt_2949p12.cfg)
    or 2T2R_RevC_ADC-Bypass-82820_DAC-Int18x-8847p36M_TxClkOut-Div3.cfg) or do I need to load any more?
  • In reply to Daniel Saspa:

    The difference between the 2 config files are how the ADC is clocked. This is shown in Table 2 in UG.
    The spurs at offsets aren't expected. Are those with or without any input? How large are they?
  • In reply to Satish Uppathil:

    It is without input. So the spurs occur in Channel A, but not in Channel B. Signal magnitude ranges from -34 dBm to -38 dBm

    Another anomaly that I noticed is that in bypass mode, when I input a signal, for example 700 MHz, I do not see the signal at 700 MHz mark in the HSDC Pro GUI. However, there is a signal detected, just shifted away from 700MHz. Is that normal?

    Also, is there any known issues with aliasing of the signal when in bypass mode? I see multiple similar signals repeating in the spectrum of the input signal.

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.