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INA199-Q1: about input bias current

Paul Kim
Intellectual 1430 points
Part Number: INA199-Q1

Hi team

can I get your reply ?

[1] D/S says TYP 28uA for input bias current.

     so, total input bias current for two input pins should TYP 56uA(=28uA x 2) ?

[2] figure 8 and figure 9 are also meaning input bias current for only one pin.

    so, I has to double the graphed Ib at preferred Vref and Vs ?

  • 0
    TI__Mastermind 24165 points

    Hello Paul,

    I am linking a previous thread started by you, where I provide details on input bias current profiles and how these can be derived and used from the data sheet here.

    1.  Yes, the average of IB+ and IB- for a VCM of 12V and a VS of 5V will be 28uA.  So to get the total you will multiply 28uA by 2.

    2. Yes,  for the total of the input bias current for any of the operating conditions shown in the above plots you will need to multiply by 2.