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MCM2+8 and BCM5221



Hi,

What are the required electrical characteristics for the Transmit TD+/- 
and Receive RD+/-
signals between the MCM2+8 and the RJ45 magnetic module.

I read the BCM5221 specification and I saw that the input common mode 
voltage must
be between 1.85 and 2.05 V. On my design I measure 3.24 V !

I'am using a HFJ11-2450E 10/100BASE-TX connector.

I would be very interested to have a schematic of the internal MCM2+8 or 
to know which are the
observed values on a working design with the MCM2+8.

What could be the reason of such a mismatched level on the RD+- common 
mode voltage ?

Best regards,

Claude

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 Claude GIRERD - Service Electronique
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 INSTITUT  DE  PHYSIQUE  NUCLEAIRE  DE  LYON
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