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Asking about INA198 and LMP8640

Jake Kim
Intellectual 680 points
Other Parts Discussed in Thread: LMP8640, INA198

Hi, TIer

1. LMP8640 : It is available for Automotive application in the datasheet. So, has it qualified AEC-Q100 certification?

2. INA198 : hope to know how much current would flow through INA198 when Vs=0 or things like attached picture.

In INA198 datasheet, not described. Could you answer for it?

 

  • 0
    TI__Mastermind 25815 points

    Hello Jake,

    Concerning question #2, the INA193-8 family of devices require a shunt voltage of at least 20mV for linear operation. Therefore we do not test or specify the device for shunt voltages less than 20mV.  Technically the values in the data sheet (+/-8uA typ, +/-16uA max) is the specification when Vsense=100mV, V+=12V, and Vcm=12V.  I did take a measurement in accordance with the aforementioned data sheet setup but with Vsense shorted.  The input bias current for this measurement was 22.3uA.  Please be aware that this is not the configuration used for final test.  In order to assure data sheet performance the shunt voltage (Vsense) must be 100mV.

  • 0
    TI__Guru 55056 points

    Hi Jake,

    #1 - No. The LMP8640 is not available in Q-Grade - but if the volumes are high enough and you can wait a few months.....it can be.

    #2 -You found it!

    This is the "leakage" current through each input when the supply is at 0V (grounded) and the common mode (load) voltage is at 28V.

    Essentially it is what current would flow through the inputs if the load voltage is still powered and the INA's power supply is turned off.

    This is caused by the current through the internal divider resistors ("R1") and the internal input clamp/ESD circuits.

    Regards,