Replace from HMC346MS8GE to HMC346AMS8GE, Relative Attenuation vs.Control Voltage characteristic data change !

HI all,

Please advise to us.

HMC346MS8G was EOL, then HMC346AMS8G start to evaluate.

Following is our custmor evaluation data with  EV1HMC346AMS8G, using Single-Line Control Driver @ datasheet recommend.

Relative Attenuation vs.Control Voltage characteristic data change !

Insertion Loss (V1=0V,V2=-3.4V) is -7dB (-3.1dB typ @ datasheet)

our custmor evaluation data

datasheet data

What happen is it?

Best regards,


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    •  Analog Employees 
    on Jun 7, 2019 12:00 AM in reply to sss@jpn


    For old HMC346, the design and measurement had matched on the termination resistor value of 500ohm.

    For new HMC346A designed in another process, the design used a the termination resistor of 500ohm too but the measurement showed 600ohm resistor.

    Despite of that, HMC346AMS8GE was characterized by using 500 Ohm resistor in the single line driver circuit. I also did some measurements changing the resistor from 500 Ohm to 600 Ohm, it did not make any significant change on attenuation and return loss responses.