HMC787 IF port minimum load resistance

Question

I am using HMC787ALC3B where IF port is terminated with 2 dB fixed resistive attenuator ( equivalent resistance of 110 Ohm to ground) - no DC block . How much DC voltage can I expect on IF port or what is the minimum resistance that IF port can be loaded with ?

huangzeyan · Accepted Answer

Hi 
 As showing in datasheet AMR table and interface schematics, the maximum source/sink current for IF port 12mA. If you are using it as downconverter, I believe the output DC voltage is negligible due to the diodes of the IF interface. If upconverting, you need to follow the rule of 12mA so that the core will not be damaged. 
 Regards.)

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HMC787 IF port minimum load resistance