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speed ADC?

Martin Valencia
Guru 15175 points
Other Parts Discussed in Thread: HALCOGEN

Good day community Hercules, I have some questions about the ADC, according to technical data sheet, speed Sample / Hold / Convert is 600(ns)

but when I go to see the value in HalCoGen not meeting these 600 ns but if I am in with a value of 1.5(us).

I wonder why this happens and really what is the speed of ADC conversion?

greetings
Martin Valencia

  • 0
    TI__Guru 68830 points
    Martin,
    Check the ADC "General" tab to make sure you have the Cycle time set to 30ns.
    It takes 1 clock to convert each bit of ADC data plus however many clocks you set for sample time.
    So if you have the clock at 100ns - then it's going to take something like 1.x us.
  • 0
    TI__Expert 4580 points
    Hello Martin:

    How are you configuring the Cycle Time in ADC1 General tab? If you configure VCLK1 to 30MHz in GCM tab and set the Cycle Time to the minimum value in ADC1 General tab, you'll get a total time very close to 600us.

    Regards,

    Enrique
  • 0 in reply to Enrique Lizarraga
    Guru 15175 points

    I have learned that I can also modify the VLK1 from GCM, thanks

    thank you very much for the help, it works perfectly.

  • 0 in reply to Anthony F. Seely
    Guru 15175 points

    I've done a few tests the ADC Hercules RM57, with improvements in time for sampling, 0.56 (us).
    the results are quite impressive, it seems that Hercules has a better resolution than my oscilloscope.

    triangular signal is much better than my oscilloscope

    sinusoidal signal: the Hercules overcome my oscilloscope showing peaks that in the oscilloscope were somewhat hard to notice.

    something similar happened here!

    very impressive the speed of ADC Hercules RM57.

    greetings

  • 0 in reply to Martin Valencia
    TI__Guru 68830 points
    Awesome post Martin!

    BTW - how many bits is the digitizer in your scope? I think most low end scopes are 8 bits so you might be seeing the difference between 8 and 12 bit ADC ...
  • 0 in reply to Anthony F. Seely
    Guru 15175 points
    yes, according to datasheet has a resolution of 8 bits, and is very impressive the difference between 8 and 12 bits.


    regards :-)