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LMH6401: input common-mode voltage

stephen lyons
Prodigy 50 points
Part Number: LMH6401

Urgently need clarification of the following Electrical Characteristics,  Vicm, Viclr, Vichr, found in the datasheet;   literal interpretation implies there is dc common mode voltage at each input pin.

Vicm states that is is self-biased to mid-supply (in our case 2.5V DC);    Our concern is interference with the DC common mode voltage at the stage driving the LMH6401;  are dc blocking capacitors

required in this case ?   Is there truly Vicm = 2.5V at each input pin ?   Thank you

  • 0
    TI__Expert 7875 points
    Hi,

    The input common mode will bias to mid-supply with a +/- 300mV maximum variation. However, you can easily drive the device DC coupled with little required DC current to shift the common-mode voltage. If you do DC couple the device, it is best to keep the common mode within the given Viclr and Vichr ranges to avoid performance degradation.

    You can of course also AC couple to the device and it will self-bias the common mode appropriately.

    Regards,