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MSP430F448 internal resistance of ADC12 channels

franziskus
Expert 6766 points
Other Parts Discussed in Thread: MSP430F448

Team,

my customer needs to know the internal resistance of the ADC12 channels of MSP430F448 (P6.0 - P6.7).

Thanks,

F

  • 0
    Guru 46710 points

    Similar question (of datasheet comprehension) is answered multiple times in this forum. Here for example. Let your customer pay special attention to User's Guide of chip in question,  chapter "ADC sampling timing considerations".

    If you (customer) have further questions - please do not hesitate to ask.

  • 0 in reply to Ilmars
    TI__Expert 6766 points
    Thanks Ilmars!

    For my understanding, that means when I do DC measurements such as with an NTC, the internal resistance is very high due to the capacitance to GND.
  • 0 in reply to franziskus
    Guru 46710 points

    FRAMziskus said:
    For my understanding, that means when I do DC measurements such as with an NTC, the internal resistance is very high due to the capacitance to GND.

    Wrong. Impedance of capacitor matters only for AC signals.

    For DC signals internal resistance of ADC and it's input shall be considered as very high due to very low leakage current which is typically around +/- 50nA.

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