LTC5510 isolation improvement

Hi,

In my design I intend to use common LO signal for two mixers LTC5510 with different signals at "IN" ports. So, I'd like to know IN to LO supression of the LTC5510 (in the Data Sheet I see only LO to OUT leakage and IN to OUT isolation).

Could You help me to evaluate IN - LO and OUT - LO isolation for extended input frequency range from 30 MHz to 6 GHz (OUT ~ 100 MHz)?

It is suitable to use ADCLK925 to separate LO signals in order to improve isolation between two mixers? 

Best regards,

Ruslan

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  • +1
    •  Analog Employees 
    on Feb 7, 2019 6:56 PM

    Hi Ruslan,

    The LTC5510 datasheet specifies IN-LO isolation as > 55dB for 3.3V/5V Up/downmixer applications up to 3GHz:

    Beyond 3GHz, IN-LO isolation will likely be lower, maybe by 10-20dB at 6GHz. You can purchase a demo board online or request one through your local ADI sales representative and evaluate the performance under your specific conditions.

    Although I could not find any channel-to-channel isolation in the ADCLK925 datasheet, I suspect the fanout output buffers would offer reasonably good isolation.

    Regards,

    SH

Reply
  • +1
    •  Analog Employees 
    on Feb 7, 2019 6:56 PM

    Hi Ruslan,

    The LTC5510 datasheet specifies IN-LO isolation as > 55dB for 3.3V/5V Up/downmixer applications up to 3GHz:

    Beyond 3GHz, IN-LO isolation will likely be lower, maybe by 10-20dB at 6GHz. You can purchase a demo board online or request one through your local ADI sales representative and evaluate the performance under your specific conditions.

    Although I could not find any channel-to-channel isolation in the ADCLK925 datasheet, I suspect the fanout output buffers would offer reasonably good isolation.

    Regards,

    SH

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