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INA1650: Damage without input decoupling capacitor

Gabe Gindele
Prodigy 75 points
Part Number: INA1650

Can TI confirm the input decoupling capacitors are mandatory on INA165x? I just experienced two consecutive device failing after connecting both inputs GND of the unused channel. +/-9V symmetrical power was used. The device failed in about 25 minuets and overheated. One of the input to common resistance changed from the initial 500K to 200K, the two inputs shows NC. 

  • 0
    TI__Genius 11325 points

    Hi Gabe,

    Input AC coupling capacitors are not "required" for linear operation, however there are concerns with DC biasing and voltage offsets that must be accounted for when DC voltage is present at INA inputs.

    It sounds like you are trying to configure your unused channel to maintain a known linear state during operation. What is the COM pin of the unused channel connected to?

    A recommended method to terminate an unused channel, is to connect the COM pin to VMID(OUT) and leave the inputs floating. The inputs will be pulled to mid supply by the internal 500k input biasing resistors.