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Compiler/TMS320F28379D: multiple ADC inputs (more than 3)using TMS320F28379D

nolan
Intellectual 590 points
Part Number: TMS320F28379D

Tool/software: TI C/C++ Compiler

Hi

I want to implement multiple ADC in TMS320F28379D , but the LAUNCH pad has only 3ADCs A,B,C . 

I am able to take 3 adc inputs synchronously . But i want 5 ADC inputs to be synchronized  at the same time . 

My input is from signal generator.

So is it possible to for me to take 2 inputs synchronously from A0, A1 ,but take A0 in channel 1 and A1 in channel 2 ?

Regards,

Ashwin

  • 0
    TI__Guru 60865 points
    Hi Ashwin,

    The launchpad also has ADC-D, it is just pinned out on a separate header (J21).

    It is not possible to sample more than 4 inputs at the exact same time (since there are only 4 ADCs).

    You can have one trigger source sample multiple channels on the same ADC (e.g. A0, A1, A2) but these channels will be sampled sequentially. The time difference between channels in 12-bit mode at max speed is roughly 1/3.5MSPS = 285ns.

    You can do some averaging tricks to get an average sample that is effectively at the same time. e.g. if you sample A0 --> A1 --> A0 and then average the two A0 results, the effective time of the averaged signal will be the same as the A1 sample.
  • 0 in reply to Devin Cottier
    Intellectual 590 points
    Hi David,

    thanks for the response.
    I will check the J21 pins .

    Regards,
    Ashwin