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INA849: INPUT BIAS RETURN CURRENT PATH

Karthikeyan S
Prodigy 120 points

Part Number: INA849

Hello

I am trying to use INA849 to find the difference between an ref signal and feedback signal.My ref signal comes froma HIGH-Z signal generator and feedback signal comes from an photo diode with 50ohm impedance.What should be the resistor value to be placed at input pins for input bias return path.What could be the ideal value of gronding resistors at input pin. Thankyou

  • 0
    TI__Mastermind 30390 points

    Hi Karthikeyan,

    It depends. I've got a few questions to better understand your system: 

    • What output voltage are you looking for?
    • What is the common mode voltage at the inputs?
    • What are the supply voltages?
    • What is the expected input differential signal? 

    Best Regards,

    Robert Clifton