I see that some of your data sheets seem to specifically avoid saying they support LVPECL outputs by saying only that they support LVPECL output levels. Is this esoteric or is there a real difference. If there is a real difference, please explain.
LVPECL is an acronym for Low Voltage Positive Emitter Coupled Logic. There is a standard for LVPECL that specifies common mode and voltage swing levels. The name implies that the output driver is a bipolar device but a CMOS driver design can achieve the same common mode and voltage swings as a bi-polar design. For this reason a bi-polar driver is a 'True' LVPECL and a CMOS design is LVPECL "like" or "LVPECL compliant".
For the AD951x family of clock devices they are 'True' LVPECL and need the neccassary pull down terminations. The AD9523, AD9523-1, AD9524, AD9548, and other clock products are CMOS design and require only a 100 ohm differential resistor accros the outputs to properly termininate into a differential 100 ohm impedance.
Retrieving data ...