AD629 Failure Due to Inputs

We currently have an inverter that we are using the AD629 device to control a speed input of up to 9V (0-9V)

We have are using a dual power supply +/-12V, ARZ package

We have ruined a couple of these chips and the only difference is that sometimes the supply voltage was not supplied first.

Does having an input signal with no supply voltage active be a possible source of failure?

What are other modes of failure common to this chip?

  • Hi JMitchell418,

    The parts usually get damage if you violated any of the limits specified on the Absolute maximum ratings  as shown below.

    May I know what is the connections of Pin 1 and Pin 5 (REF(-) and REF(+)) on your circuit?  If you could share your schematic, it would also be helpful in troubleshooting.

    Best regards,

    Emman