• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 46 subscribers
  • Views 357 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

INA231: Input impedance for the shunt pin inputs (V+ and V-)

Jonathan Geronga
Expert 7930 points
Part Number: INA231


Hi Team,


We have a customer asking for the input impedance for the shunt pin inputs (V+ and V-) because only the input impedance for the bus pin input is listed in the datasheet.

Do you have information to share for the input impedance for the shunt pin inputs (V+ and V-)?

Thanks!

Jonathan

  • 0
    TI__Mastermind 35290 points

    Hi Jonathan,

    The differential input impedance between the input pins is 12Kohm; and the common mode input impedance of the two input pins is a combined 10 mega Ohms approximately when common mode voltage is higher than supply voltage. The equivalent input impedance is lower otherwise, but the input bias current should still be under 20uA. The IB vs Common mode voltage characteristics can be found in this plot:

    Regards, Guang

  • 0 in reply to Guang Zhou
    TI__Expert 7930 points

    Hi Guang,

    Thank you for this very informative answer you have given to me.
    I will now share this with the customer.

    Thanks!

    Jonathan