Forum: Analog Circuits GigE PHY Power Specification

von Rio R (Guest)

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Hi there,
I am looking for the ideal GigE PHY.
Power seem to be my problem in this circuit and I am looking into this 
right now.
I recognized in a few datasheets that there are current numbers fpr 
analog and digital power supplies and in addition to that there is an 
entry called "center tap". That is then the center tap of the RJ45 
So what happens there and why is current drawn from the PHY to the 
center tap? When is this relevant? How is determined how much power is 
drawn to it.?

One spec is also mentioning a dependency to a power class driver A/B. I 
dont have an appnote for that device (Marvell).

Thanks a lot


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