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Is PCML the same standard as CML?
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I don't know. As a matter of experience though, ignore whatever 'standard' the data sheet description for a part says it uses, and look at the technical details in the datasheet.
For example, I used a PLL part from Analog devices that says it has CML outputs. CML outputs should have pull-ups to the supply rail at the transmitter ... but this particular part does not ... so it was CML 'compatible' (with the addition of external resistors), rather than CML compliant.
For AC coupled links, the things you want to find in the data sheet are the input voltage differential minimum and maximum at your receiver, and the corresponding output differential possible from your transmitter. If you find an incompatibility, then it needs to be resolved. If the transmitter amplitude is too big, then a termination/attenuation network can be used. If the transmit amplitude is too small, then you need a different part (or high-speed comparator between the transmitter and receiver).
Cheers,
Dave
Honored Contributor
