HMC241

Question

Hello, 
 If ports RF1, RF2, RF3, or RF4 on the HMC241 are not connected to any circuitry, can the 
 non-connected port be left floating or is a DC blocking capacitor to gnd or VCC required to be connected to the unused port? 
 Best Regards.

FormerMember · Accepted Answer

Hi, 
 HMC241's RF ports are DC coupled with ~Vdd. Floating the unused RF ports would change the part performance slightly. We recommend terminating unused RF ports with 50 Ohm resistors to Vdd (DC blocking capacitor is not required but Vdd should be decoupled properly) or GND (DC blocking capacitor is required). 
 Regards)

FormerMember · Answer

Hi, 
 The pins designated NC (Not Connected) are not internally connected to the die. It is not necessary to connect NC pins to any voltage, they can be left floating. However, the connection of NC pins to ground prevents noise injection from these pins, which may most probably distort RF and digital signals. We recommend to connect NC pins to ground. 
 Best.

EZAdministrator · Answer

This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum. Thank you, EZ Admin

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