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DAC8718EVM: 14-16bit DAC at least 8 channel. With streaming evaluation tool support.

jonathan eagle
Prodigy 10 points
Part Number: DAC8718EVM
Other Parts Discussed in Thread: DXP, DAC81408, DAC81416, DAC80508, DAC8728, DAC8718, DAC8568

I am looking for a 16bit at least 8 channel voltage output DAC.

I want to be able to test with data in a file and stream it and maintain that I can run “indefinitely” at 4khz per channel as part of my testing. It seems that your DXP software would do this. Using your development kit and MMB0 board running DXP on a PC. 

Is there some other option that would allow me to evaluate the device? There are other possible DACS, such as 

DAC81408/DAC81416 no DXP

DAC80508 no DXP

DAC8728 no DXP

Can you confirm that the setup would be able to keep up with that data rate? (Essentially 4khz x 8 )?

Which option to use? The ones marked no DXP have software but I suspect would not keep up the speed.

There are several options that meet the specs, with some EVMs that mention DXP, some not.

DAC8718 yes DXP

DAC8568 yes DXP

What do I order to get this working?

It appears that the MMB0 is bundled with some kits but not the ones I would need.

Could you tell me the proper part number to purchase along with the EVM?

Should I be concerned about using windows 10/11 with the DXP software

Thanks

Jonathan

  • 0
    TI__Guru 53773 points

    Hi Jonathan,

    Really, none of our devices have this specific function. The DXP software and the MMB0 could generate a sinewave, but had some limited configuration settings.  In addition, DXP does not operate on most Windows 10/11 computers and we are ending that platform soon. 

    What DAC performance are you trying to measure with these devices? THD? Are you designing the DAC into some kind of application or are attempting to use a DAC EVM as some kind of excitation signal for an external evaluation. Would a bench-top instrument be better?

    These devices can be controlled with some external data generator to generate sinewaves or other arbitrary waveforms, but we do not have a platform that can do it automatically.

  • 0 in reply to Paul_Frost
    Prodigy 10 points

    Hi Paul,

    I saw issues of driver signage that seemed to be able to be overcome. There were solutions described on this site.

    I plan to design this into a setup and make multiple setups. Like any system, one needs to be able to verify its performance. (I see no bench top devices that have 8 channels by the way.)  According to the documentation, the DXP software can read from a file and stream the data. Why does it have to be a sinewave?

    But my basic question is, can I read from a file and drive the EVMs listed at the prescribed data rate using DXP? 

    Jonathan 

  • 0 in reply to jonathan eagle
    TI__Guru 53773 points

    Hi Jonathan,

    The DXP program cannot generate arbitrary waveforms.  It supports only a subset of waveforms:

    Sine, Triangle, Square, Sawtooth, DC output.  So you are limited when using DXP.  IF you are looking for a true arbitrary waveform streamer, we do not offer any tools that will operate a DAC in that configuration.

    Thanks,

    Paul

  • 0 in reply to Paul_Frost
    Prodigy 10 points

    Looking at the manual, it indicates that one can generate arbitrary waveforms.

    This is from sbau146a.pdf. I've never tried the tool, just read the manual. Is this not the correct manual?

  • 0 in reply to jonathan eagle
    TI__Guru 53773 points

    My understanding is that this function allows for a single period of an AWG, with only a limited number of points (though I cannot find a clear answer on how limited it is).  I was trying to implement a test of it, and the feature had a few errors.  Just to be realistic, I would not rely on this method if you are trying to create an easy to use setup.  You could probably utilize a low-cost data generator for this function and have a more reliable software interface.

  • 0 in reply to Paul_Frost
    Prodigy 10 points

    Thanks Paul, 

    The only options seem to be pc plug in cards. There are really no low cost 8 channel setups (simultaneous out)  that meet the requirements even though 4khz is not very high. If you are aware of any such things, let me know.

  • 0 in reply to jonathan eagle
    TI__Guru 53773 points

    My understanding is that you are not looking for a solution for a production device, but really some kind of bench instrument for testing or characterization, correct? I suppose low-cost is relative, but could you consider some kind of PXI solution from NI? Maybe the PXI-6289 or 6723?