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UCD9081: ADC conversion time

Dan Moyles
Prodigy 10 points
Part Number: UCD9081
Other Parts Discussed in Thread: UCD9090A

How long does it take for the SAR ADC to make a conversion if the UCD9081 oscillator is set to maximum frequency?

I want to estimate the worst-case time for the UCD9081 to detect a fault. For example, if the UCD9018 is measuring the voltage on MON1 and a fault occurs on MON8, how long will it take for the supply on MON8 to be measured and disabled?

  • 0
    TI__Guru 66230 points

    Hello

    The Rail sampling rate is 19.8KHz(50.2us) based on the internal clock. The sample result is a running 3-TAP IIR filter which could take up to 4 sample to detect fault.

    Other than sampling rate, there are many other factors which impact the timing due to all the internal device processing.

    you may see mill-second  variation on the fault detection and disabled.

    if you want to have a fast response, UCD9090A can help you.

    Regards

    Yihe 

  • 0 in reply to yihe
    TI__Guru 66230 points

    Hello

     We haven't heard from you for a while and assumed that the issue was solved. Please reply if you need any further help.

    Regards

    Yihe