DC-Coupling LVDS Tx to PCML Rx (Cyclone IV GX)

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I think when I connect the SY54016AR (with Vcco of 1.2V) to the FGPA (either with external termination to 1.2V or using the internal termination of the FPGA), I will not achieve this required Vcm of 0.82V +/- 10%.

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If you can find a part with Vtt = 1.2V and Vpp = 0.8V, then this would produce Vcm = 1.2V - 0.8V/2 = 0.8V, which is within 10% of Vcm.

For example, the AD9956 AgileRF has a CML/PECL output driver that does not include resistors. On that part you can program the constant current, so with a 50-ohm termination at the FPGA, you could program an output current of (1.2V - 0.82V)/50-ohm = 7.6mA, and have the correct Vcm. I realize that this Analog Devices part is not suitable for your application, but it does show you that parts with programmable output voltage swing exist, and now you just have to find one :)

Cheers,

Dave