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Original question:

INA240-Q1: Bias current: which direction and how much max and min value?

INA240-Q1: bias current vs supply voltage

Martin Steube-Henkel
Intellectual 1250 points
Part Number: INA240-Q1
Other Parts Discussed in Thread: INA240

Hello Guang 

how is the bias current dependent of Vs of INA240?

I found the dependency of the common mode in the datasheet.

thanks and best regards

Martin

 

  • 0
    TI__Intellectual 1235 points

    Hi Martin,

    The supply voltage vs input bias current plot will be very similar to the common-mode voltage vs input bias current plot. The only difference will be that the highlighted vertical transition will shift to whatever the supply voltage is (lower Vs will shift the transition left, higher Vs will shift the transition right).

    Let me know if you have any other questions.

    Cierra

  • 0 in reply to Cierra Cowley
    TI__Intellectual 1250 points

    Thanks Cierra,

    this helps.
    Another question came up.
    When using the bidirectional current measurement is the bias current direction dependent of direction of the current measured? Means current is out of the inputs if I measure negative currents? 

    Thanks 

    Martin

  • +1 in reply to Martin Steube-Henkel
    TI__Intellectual 1235 points

    Hi Martin, 

    The bias current direction is dependent on the differential voltage as shown in Figure 9-2. So, the bias current can be in either direction when measuring positive/negative currents. For negative differential voltages, these plots can be extended to the left following the same linear slope.

    Cierra