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ADS1222 +/-5 Differential input range

jong
Prodigy 50 points
Other Parts Discussed in Thread: ADS1222One of the features listed for the ADS1222 is a +/- 5V differential input range. However, maximum rating indicates that the analog input voltage to gnd can only go from -0.3 to VCC + 0.3. Moreover, the voltage reference inputs should not exceed Vdd by 100mv: Gnd – 100mV
  • 0
    TI__Guru** 113765 points

    Hi Jong,

    The differential input refers to one input relative to the other and not with respect to above or below supply ground.  In other words if AINP is +5V and AINN is at ground, the result would appear as full-scale positive.  If the AINP input is ground and the AINN is +5V then you would see a negative full-scale result.  So the result will be based on the AINP input relative to the AINN input.  In the first case AINP is above AINN and in the second case it is below. This example assumes that the supply and reference are 5V.

    Best regards,

    Bob B

  • 0 in reply to Bob Benjamin
    Prodigy 50 points
    Hi Bob, Thanks for the clarification. I tried out the circuit and it works! Thank you. :) jong