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In ADCs, what are Pseudo-Bipolar Inputs

Discussion in 'Electronic Basics' started by brazingo, Feb 9, 2006.

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  1. brazingo

    brazingo Guest

    i've been looking for bipolar ADC. I came across one which says it
    is a unipolar differential but supports pseudo-bipolar. what does
    pseudo-bipolar mean ? I tried googling and found only 'pseudo
    -bipolar' products but no description on what that means.
  2. John  Larkin

    John Larkin Guest

    It means both inputs must be positive with respect to ground, but one
    can be measured "bipolar" with respect to the other.

    So if you hold the negative input pin at +2.5 and move the pos pin
    around, you can appear to measure -2.5 to +2.5 as the + input actually
    goes from 0 to 5. So then you can play some tricks with external
    level-shifting resistors to measure true bipolar signals.
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