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HMC221BE circuit design

Question asked by jhshin on Dec 4, 2015
Latest reply on Dec 7, 2015 by s.ilke

Evaluation board of HMC221BE is shown below in data sheet.

1KOhm resister was used in control input A/B line.

Is the resister mandatory?

If yes, what is role of the resister?

 

Thanks in advance.

 

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