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Regarding the Vcc selection for ADC10 conversion in MSP430G2553

Bina Bhatt
Prodigy 70 points

As per the datasheet, it looks like there is no buffer provision when Vcc is selected as Vr+  i.e. SREFx=0 in ADC10CTL0 register. Hence, the sampling time would be only dependent on the following formula: tsample > (RS + RI) × ln(2^11) × CI and not the tREFBURST, is this understanding correct? Thank you.

  • 0
    Guru 46710 points
    Yes. When you use VCC as reference, then buffer is not used, thus reference settling time shall be assumed 0, sampling time formula is as you say: tsample > (RS + RI) × ln(2^11) × CI

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