CDCM6208V2EVM: LVPECL input reference

Matthew,

In the datasheet, it lists later on (page 29) that the universal input supports these input types: (LVDS, CML or LVCMOS) - at first glace it looks as if this part does not actually support LVPECL input, despite what the first page of the datasheet says. There is not a mention of LVPECL in the differential input characteristics table either.

However, on page 23 of the datasheet, there is a diagram for the LVPECL input configuration:

This looks nearly identical to the CML configuration, except the pullup voltage is different:

I believe that you may be able to use the CML input selection for LVPECL - I will try this on the bench and see if this is successful, and let you know by tomorrow.

Thanks,

Kadeem

So I take it that your bench testing with LVPECL inputs in the CML configuration were unsuccessful? Did you also try biasing to Vcc-2?
Thank you for the assistance.