I need your support to implement a proper ac coupled interface between LTC5594 I/q demodulator IF OUT and AD9684 analog input. There is no reference Vcm to feed LTC9684 so that DC coupling is a big deal.
In datasheet of LTC9684 there is some IF out termination resistor to set output current 18mA. There is an application circuit at page 32. This circuit shows DC-coupled interface between LTC5594 and AD9208 and the required termination resistors are 73.2ohm to GND where ADC input impedance 200ohm. AD9684 has a similar input structure with AD9208.
I will be very glad if you advice me an AC-coupled interface and termination resistor value for the below application circuit