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LMH5485-SEP: Input-Output Transfer Function

Ray Vincent Aranzaso
Mastermind 18180 points

Part Number: LMH5485-SEP

Hi,

Good Day.

I would like to know about the input-output transfer function relationship of LMH5485. How is the transfer function calculated if my PN inputs Rg are not equal?

Please advise. Thank you very much.

Best Regards,

Ray Vincent

  • 0
    TI__Mastermind 23226 points

    Hi Ray,

    When the gain is different between the two feedback paths of a fully differential amplifier, the output will not be centered around the Vocm setting, since the differential amplifier is much stronger than the Vocm amplifier. The non-centered, differential output gain will be the average of the two feedback gains. This is not really the same as a different transfer function, as it might not be a valid condition for a fully differential ADC receiver, unless the difference is small.

    What is the reason that you want to use different Rg values? Is there a way to avoid this by compensating the other input pin?

    Best regards,

    Sean

  • 0
    Guru 140200 points

    Hi Ray,

    and please give us a schematic.

    Kai