• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 46 subscribers
  • Views 459 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.

DAC5682Z Non interpolating mode

Newton
Expert 1125 points
Other Parts Discussed in Thread: DAC5682Z, DAC5688, CDCM7005

It  appears that for DAC5682Z the interpolating filters can be bypass.  So the question is whether the part can operate in a non-interpolating mode at a high enough input data rate.  We figure we would need to operate both A and B DAC outputs non-interpolated at 700 to 800 Msps.  While the Electrical Characteristics table on pg. 10 (of the June 2009 version) of the datasheet clearly indicates max Fdata of 1000 Msps (DLL enabled), Table 1 Modes of Operation seems to say that when using both DAC outputs with X1 interpolation mode, the max data rate per channel is 500 Msps, with max BW per DAC of 250 MHz.  Is this right?

  • 0
    TI__Intellectual 1395 points

    Hi Himansu,

    You are correct in that the interpolating filters can be bypassed. When this is done the maximum non-interpolated data rate is 500MSPS. The reason for this is that the maximum interleaved data transfer rate is limited to 1GSPS. So although the DACs can run at 1GSPS, the LVDS transfer rate limits the input data rate. Only in single DAC mode (no interleaving of the data) you can operate the device as a non-interpolating DAC: 1GSPS-in, 1GSPS-out.

    Regards,

    Ruben

  • 0 in reply to Ruben
    Prodigy 135 points

    Hi Ruben,

    im beginner and  work with TSW3100 EVM and DAC5688 EVM..and in the users guid pdf of the TSW3100 EVM (Site 31) it"s written:

    3. Load the following setup file for the CDCM7005: C:\Program Files\TexasInstruments\TSW3100\Example Register Files\Example_1.reg7005

    4. Load the following setup file for the DAC5682Z: C:\Program Files\TexasInstruments\TSW3100\Example Register Files\Example_1.reg5682

    and i don't know how to load it..and on the other side in the DAC5688 EVM user's Guide (site 31) it's written:

    8. Program the CDCM7005 and DAC registers as necessary. An example configuration file

     

    example.txt is included under the installation folder:

    C:\Program Files\Texas Instruments\DAC5688/89\DAC5688/89Configuration Files\

    9. Program and run the pattern generator. If using the TSW3100, see the user’s guide for more information on how to set up a digital pattern.

    My problem that even when i load the example.txt to the DAC5688 software i don't get outpu on the spectrum analyzer.

    Do you know where exactly i have to program or load..i would be thankfull for it

    Moadh