How to set LTC5594 ADRF6520 AD9684 Common mode voltages ?

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    •  Analog Employees 
    Jun 8, 2018 +1 verified

    In addition to setting LTC5594's Vcm pin to 1.375V, you also need to properly set the output ground return resistors, R3-R8. The LTC5594 has current-mode IF outputs that require a termination resistance…

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    •  Analog Employees 
    on Jun 8, 2018 9:13 PM

    In addition to setting LTC5594's Vcm pin to 1.375V, you also need to properly set the output ground return resistors, R3-R8. The LTC5594 has current-mode IF outputs that require a termination resistance to create output common-mode voltage. The optimum current is around 18mA per output pin. The internal feedback adjusts the current to match the output common-mode voltage to what is set on Vcm.

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    •  Analog Employees 
    on Jun 8, 2018 9:13 PM

    In addition to setting LTC5594's Vcm pin to 1.375V, you also need to properly set the output ground return resistors, R3-R8. The LTC5594 has current-mode IF outputs that require a termination resistance to create output common-mode voltage. The optimum current is around 18mA per output pin. The internal feedback adjusts the current to match the output common-mode voltage to what is set on Vcm.

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