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INA216A3 design help 12V sense with 3.3V max output

Ron Michallick
Guru**** 166236 points
Other Parts Discussed in Thread: INA214

Will this circuit work well? Common mode is 12V, INA216A3 power is 3.3V. Output current 0 to 1.5A. Only the average output current is needed so improvement to low pass filter is desired. Is the INA216A3 sensitive to differential and common mode input noise? Is common input mode range really up to 5.5V with a 3.3V supply like the data sheet suggests (I suspect , no)?

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    TI__Expert 6930 points

    Hi Ron,

    The INA216A3 does not have a separate power supply pin as indicated in the schematic...and the INA216A3 common mode input will not withstand 12V in your application so you should not use it.  Please take a look at INA214 (also G = 100) It is designed to accommodate a 12V common mode input when operated forma 3.3V power supply.  As far as filtering is concerned please refer to page 10, Figure 24 of the INA214 data sheet.  It is important to keep the filter resistance to 10 Ohms or less to avoid adding gain error to the overall application.  Please let me know of you have additional questions.