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ADV7441a Power Supply Sequencing

Question asked by ahoehn on Jan 4, 2011
Latest reply on Jan 5, 2011 by mattp

Hello,

 

The recommended power supply sequencing stated in the hardware manual for the ADV7441a was not followed in our prototype  boards yet the part appears to work fine in all four of our units.  Also, there is no exact spec on time a supply should be up before another one.  Our existing PCB has all the supplies  power up at about the same time.

 

Is the hardware manual  correct in stating it wants the 1.8V supplies up before the 3.3V and vice versa  on power down?  I noticed the power sequencing is opposite for other similar  Analog Device chips such as the ADV7842.  How critical is the power sequencing for the ADV7441A?

 

Thanks in Advance,

 

Alan

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