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(ADV7390)Power up sequence.Supply current.

Question asked by donadona999s on Sep 19, 2017
Latest reply on Sep 20, 2017 by donadona999s

Hi !

 

I have a question about ADV7390.

Our customer checked the supply current with the scope.

yellow;3.3V power supply   2V/div

green;1.8v power supply    2V/div

purple;3.3V supply current  100mA/div

10ms / div

 

When they input 1.8V after 3.3V, it looks supply current goes lower.

 

So my questions are these.

 

Q1)

Why the 3.3V supply current is higher than when they input 1.8V?

Q2)

Do you think this current waveform is correct?

Q3)

It look like there is some spike at supply current waveform when they input 1.8V.

Why this happen?

 

Best regards

Kawa

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