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INA2143 Leakage

Al Duarte
Prodigy 210 points
Other Parts Discussed in Thread: INA2143

I have a customer who is using the INA2143 and has a question related to leakage. Customer would like to know on Input pin N+ and N-, how much leakage current is there on the pin?

  • 0
    TI__Expert 7185 points

    Al,

    The specification to which you are referring is input bias current which on a bipolar difference amplifiers such as the INA2143 can be as much as +/-50nA.   Input bias current can be an issue in applications with resistance in series with the inputs because it can develop an offset voltage that gets translated to the output; however, with difference amplifiers such as the INA2143 adding series resistance is strongly discouraged as the on chip gain resistors are trimmed ratiometrically and their absolute value can be off by as much as 20%.  The effect of this is a severe degradation in CMRR (see text on page 10 of the INA2143 data sheet).  As a result, IB on difference amplifiers is generally not specified because the IB*R effect from the series input resistors is encompassed in the input offset voltage specification. 

    Matt