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ADC of TMS320F28377D

Keyur Acharya
Expert 1740 points

Other Parts Discussed in Thread: TMS320F28377D

Hi all,


I am using TMS320F28377D. I have a confusion regarding resolution of ADC. This controller has option for 16-bit as well as 12-bit resolution.

Technical reference manual mentions that  "Input multiplexer with up to 16 channels (single-ended) or 8 channels (differential)"


Can I use some adc as 12-bit resolution and some as 16-bit resolution?

Regards,

Keyur.

  • 0
    Guru 192875 points
    Hi Keyur,

    Yes Yes....You can configure accordingly as per your requirement.

    Regards,
    Gautam
  • 0 in reply to Gautam Iyer
    TI__Guru 60865 points

    Hi Keyur,

    Yes, you can use some channels as 16-bit and some to 12-bit.  In most instances, you will want to operate the multiple ADCs synchronously (see the device datasheet for performance implications), which means all ADCs should all be set to 16-bit more or all set to 12-bit mode at the same time.  Because of this, you would trigger all the ADCs, convert some 16-bit channels in parallel across the multiple ADCs, and then switch the mode to 12-bit for the next set of conversions.  Another trigger then comes in and again triggers all ADC, you convert your various12-bit channels, and then switch the mode back to 16-bit and repeat the process over again.

  • 0 in reply to Devin Cottier
    Expert 1740 points
    Hi Devin,
    So basically you want to say that i have to do "Start Of Conversion" two times, one for 12 bit ADCs and second for 16 bit ADCs.
  • 0 in reply to Keyur Acharya
    TI__Guru 60865 points
    Yeah, 2 start of conversions, although this is for 12-bit and 16-bit ADC channels, not for 12-bit and 16-bit ADCs - you can and should distribute the conversions of like resolutions among the multiple ADCs so they can be done in parallel.