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(ADuM1281) Supply current

Hi !

I have a question about ADuM1281 supply current.
I was reading ADuM128x datasheet.

Datasheet says that IDDI(Q) = 0.8mA_max and IDDO(Q) = 2.0mA per Channel

This means, if I use ADuM1281 and input nothing,

IDD1 = 0.8mA(B Channel) + 2.0mA(A Channel) = 2.8mA

IDD2 = 0.8mA(A Channel) + 2.0mA(B Channel) = 2.8mA

Q1)

Is my understanding correct?

Q2)

Also datasheet says that if we input 1Mbps, IDD1 = 2.6mA_max and IDD2 = 2.9mA_max.

These value are smaller than quiescent current.

Why this happen?

Best regards

Kawa

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