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ADS8684A: About startup sequence of DVDD and AVDD

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Guru 21045 points
Part Number: ADS8684A

Hi Team,

 

I understand that DVDD(+3.3V) must be less than AVDD(+5V).

However, slew late of DVDD is high so DVDD higher than AVDD during 5ms.

Then, could you please let us know if you have any concern (device is broken / malfunctions etc.)?

Regards,

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  • 0
    TI__Mastermind 24940 points

     Hello,

    This will likely not damage the device.

    But during the time that DVDD is greater than AVDD, the protective diode will likely start conducting, thus you will likely see affects of this during those 5ms, such as the voltage being held and higher current consumption than expected.

    Once the AVDD voltage increased past DVDD, the diodes will stop conducting, and device will operate normally.

    Regards

    Cynthia

  • 0 in reply to Cynthia
    Guru 21045 points

    Hi Cynthia-san,

    Thank you for the detail information.

    I’d greatly appreciate your verification.

    Regards,

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