POWER-UP SEQUENCE of ADV7611.

Hello.

I have a question about POWER-UP SEQUENCE of ADV7611.

There is a description about POWER SUPPLY SEQUENCING on datasheet, 10 page as follows:
"The recommended power-up sequence of the ADV7611 is to power up the 3.3 V supplies first, followed by the 1.8 V supplies."

Until what time does 1.8V power supply have to rise after the 3.3 V supplies power up?

Thank you!
Best regards.

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  • 0
    •  Analog Employees 
    on Dec 13, 2013 12:33 AM

    Is it possible that the 3.3 is feeding back into the 1.8v rail before the 1.8V becomes active?

    1) I would tie a schottkey diode from 1.8 to 3.3 to make sure the 1.8 never really exceeds the 3.3 rail

    2) is it possible the 1.8 comes up before your 3.3 rail and with no load on the 1.8 rail it is over shooting the target?  Try putting some resistive load on the 1.8 rail. ~100 Ohms

Reply
  • 0
    •  Analog Employees 
    on Dec 13, 2013 12:33 AM

    Is it possible that the 3.3 is feeding back into the 1.8v rail before the 1.8V becomes active?

    1) I would tie a schottkey diode from 1.8 to 3.3 to make sure the 1.8 never really exceeds the 3.3 rail

    2) is it possible the 1.8 comes up before your 3.3 rail and with no load on the 1.8 rail it is over shooting the target?  Try putting some resistive load on the 1.8 rail. ~100 Ohms

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