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ADV7604 power sequence

Question asked by chentommy on Jun 15, 2014
Latest reply on Jun 17, 2014 by chentommy


Hi,

 

I has one question about ADV7604 power sequence.

 

From the hardware manual of ADV7604, it mentioned that "there should be a 400ms delay between 3.3V supplies being enabled and 1.8V supplies being enabled." I added one RC delay and BJT switch circuit to delay 1.8V supplies to made 1.8V supplies was later than 3.3V supplies. It happened ADV7604 initial fail at the low temperature because the RC and BJT characteristics at low temperature made 1.8V supplies was later then the RESET of ADV7604.

 

I would like to know if the 400ms delay between 3.3V and 1.8V should be guarantee? If not, what is the power sequence of 3.3V and 1.8V?

 

Tommy

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