HMC3716 inputs

The HMC3716 data sheet shows differential inputs with a 50 ohm differential load. Also, it shows the NREF and NVCO ports being tied to the internal bias networks.

Must the NREF and NVCO ports be bypassed, or can the REF/NREF amd VCO/NVCO inputs be driven as true differential inputs? Thank you.

Doug

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  • +1
    •  Analog Employees 
    on Oct 7, 2019 4:29 PM

    Hi Doug,

    The REF / NREF and VCO / NVCO ports can be driven differentially but as you noted they are matched to a 50 ohm differential load internally so depending on the impedance your driving the HMC3716 with you may want to provide some external matching. 

    Best Regards, 

    Marty 

Reply
  • +1
    •  Analog Employees 
    on Oct 7, 2019 4:29 PM

    Hi Doug,

    The REF / NREF and VCO / NVCO ports can be driven differentially but as you noted they are matched to a 50 ohm differential load internally so depending on the impedance your driving the HMC3716 with you may want to provide some external matching. 

    Best Regards, 

    Marty 

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