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TMS320F28335 ADC Module - Round or Floor?

Andrea Tacchetti
Prodigy 140 points

Other Parts Discussed in Thread: TMS320F28335

Hi everyone out there,

I could not find around in data sheets whether the built in ADC module of TMS320F28335 uses a round or floor approximation between the input voltage and the digital output.

 

Thanks very much for your precious time,

       Andrea

  • 0
    TI__Intellectual 2575 points

    Hi Andrea,

    The 12bit ADC module is integrated in F28335 DSC. The regular reference voltage is 3 volt. Mean, the smallest voltage steps is 0.732mV (3V/4095). If the voltage change lowers then this step, it will not have an influence on the digital value.

    I can use a small example to make it clear.  Suppose there are no noise and ideal environment.

        - If analog input voltage is 0.35962 volt, the digital output value should be 491.

        - If analog input voltage is changed to 0.36 volt (voltage change =0.38mV), the digital output value should still be 491.

    In addtion, pleas pay attention on the range of input voltage. This is descripted in page 77 of DCS datasheet.

    http://www.ti.com/lit/gpn/tms320f28335

    Cheers,

    Wei