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HMC661- Offset in output pins for DC coupling

My application consists of connecting HMC661 with Xilinx RF SOC ADC (ZCU111 board) with sampling at 2GSPS. The ADC has Vcm of 1.25V. But I want ADC and HMC661 connected DC  coupled. 

HMC661 datasheet says that Vob pin can have voltage between 1 to 3 V and Vcm according to formula in datasheet becomes +-0.5V. 

If I want to have 1.25V offset on HMC661 outputs, what can I  do  to connect it with ADC with Vcm of 1.25V?