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ADS1115 Internal Reference

Fabio Oliveira
Prodigy 100 points
Other Parts Discussed in Thread: ADS1015, ADS1115

Hi ! 

I'm making a academic work where I do need to compare at least five ADCs. Among those I've choose, two are the ADS1115 and ADS1015. I'm in doubt of what's the internal reference voltage of these two ADCs.  I've read a answer from Luis Chioye in this thread:

http://e2e.ti.com/support/data_converters/precision_data_converters/f/73/p/127706/741159#741159

But as my comparisson envolves discussing the different internal voltage references from the ADCs, I need to know more details of how this internal voltage works and more importantly it's value. Can you please help me ? 

  • 0
    TI__Intellectual 1610 points

    Hello Fabio,

    The thread you provided gives you a bit of detail. The internal reference for ADS1115 is not a true reference, but rather a virtual reference.  There is not an actual voltage value for the reference. This is the reason that you can have a full-scale range that is greater than the supply. The LSB size is determined from the input range selected for the device.

    If you need any further details, we might have to talk to our design engineers. Please let us know.

    Thanks,

    Krunal

  • 0 in reply to Krunal Maniar
    Prodigy 100 points
    Hello Krunal, thanks for your answer. I would like to know: there's some data on the accuracy of this virtual reference from ADS1115 ? If not, there's some data on the ADC's overall accuracy ?
  • 0 in reply to Fabio Oliveira
    TI__Guru* 92715 points
    Fabio,


    The gain error and gain drift of the ADC reflect the accuracy of the reference. You could think of the ADC as perfect, and the gain error and gain drift as the accuracy and accuracy drift of the reference.


    Joseph Wu