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Original question:

ADS1298: Input Differential Dynamic Range

ADS1298: Input Common Mode Range

Colleen Leung
Prodigy 40 points

Part Number: ADS1298

Along those same lines, I don't understand the input common-mode range equation.  

Why is the gain in the formula if it's the input common mode? 

Thank you. 

- Colleen 

  • 0
    TI__Guru 67796 points
    Hi Colleen,

    The limit comes from the maximum output swing of each amplifier used in the PGA. The usable output range is only to within 200 mV of the supply. If the common-mode were too close to the rails, the output would have no room to swing in one direction.

    Regards,