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ADS8598H: Analog supply at ~4.6V

Antenna_Head
Genius 12245 points
Part Number: ADS8598H

On behalf of customer:

We understand the recommended lower limit for analog supply is 4.75V.  There is no intention to operate the device outside of the recommended range. 

For the purposes of fail-safe analysis, what would we expect the device to do if VDDA drooped to ~4.6V?

  • 0
    TI__Guru**** 177201 points

    Hi Steve,

    Not 100% sure what you are looking for here.  The ADS8598H does not have any specific 'fail safe' modes, so it won't detect a brown-out condition and provide any sort of specific response.  I suspect there is a voltage level on VDDA that would cause the part to reset which would upset the current conversion cycle.  I don't know off the top of my head what that level might be, but I suspect its below 4.6V.  The on-chip reference may see the droop, causing some small conversion errors, but you won't physically damage the chip.

  • 0 in reply to Tom Hendrick
    TI__Genius 12245 points

    Thanks, just looking to see if there are any "falling off a cliff" scenarios or any flags, etc... that might be useful to alert the application and a throw an alert.  Maybe the best thing for them to do is just monitor the power supplies with an ADC... but then who monitors that ADC... :-)

  • +1 in reply to Antenna_Head
    TI__Guru**** 177201 points

    No cliffs here, but you might stumble on that crack in the side walk.  If the concern is "Will the part break?" the answer is "No".  Will the conversion result's be guaranteed accurate? - again the answer is "No". If they want to get into the weeds and ask "How inaccurate might the conversion be?"  I can certainly entertain asking the design folks their opinion if you think its necessary.