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Original question:

ADC14L020: ADC14L020 maximum voltage difference

ADC14L020: ADC14L020 (URGENT)

Marcus Ferriter
Prodigy 80 points

Part Number: ADC14L020

Tool/software:

I am getting a little confused on the data sheet what the maximum voltage difference is allowed for ADC14L020. Figure 35. shows Vcm + Vref/2 which would be 1.5V + 1V/2 = 2V and then 1.5V-1V/2 = 1V. So that is only a 1 voltage differential. But then it mentions the The full scale differential voltage range is 2 * VREF. So if our Vref is 1V it would be 2*1V= 2 V differential. What is the differential for this ADC? 

  • 0
    TI__Expert 5660 points

    Hi Marcus,

    The max diff input voltage in your scenario is 2V.   You have the positive swing when VIN+ > VIN- you also need the other side when VIN+ < VIN-.
    So both give a 1V peak value (single ended) but a 2V peak to peak value when measured differentially.

    Regards,

    Geoff