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ADS4449: Inquiry of VCM resister

Louis Han15
Genius 4680 points
Part Number: ADS4449

Hello

I Inquiry of VCM resister.

If there is no 25 Ω resistance in yellow mark in the circuit below, is there a problem with the operation?

Bset Regards.

  • 0
    TI__Guru* 91947 points

    Louis,

    Yes this is a problem. The common mode voltage will not be balanced across the two inputs. If you can remove the other 25 Ohm resistor, and the common mode voltage is correct at both pins at the ADC input, then you will be OK.

    Regards,

    Jim