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window comparator

Criz Jaz
Prodigy 20 points
Other Parts Discussed in Thread: OPA454, OPA314

Hello, Its been years since I am not updated with electronics specially op amps. I would like to know if there is an op amp capable of working with +/-60V. Im trying to design a window comparator capable of checking this +/-60v meaning on the positive rail it should not get down 58v or get up to 62v with respect to ground same as for the negative rail that it should not get up to -58v or get down to -62v with respect to ground. If ever that there is no such opamp i am asking for a solution on how to work on the negative rail with respect to ground with a generic opamp

  • 0
    TI__Guru* 93105 points

    Hi Criz,

    Currently, our highest supply voltage operational amplifier is the OPA454. It is rated with +/-50 V supplies. Its absolute maximum rated voltage is +/-60 V, but we wouldn't recommend operating a product long term at that level. Also, you have to be careful trying to use some operational amplifiers in comparator applications. They may have input-to-input clamps that won't allow large differential voltages to be applied across the inputs without possibly damaging the amplifier.

    If an operational amplifier isn't specified as having its common-mode range extending to the negative rail, it can't be used in that manner. Many modern operational amplifiers do have an input common-mode range that includes the negative supply rail. These are mostly JFET, or CMOS, input operational amplifiers. For example, see the OPA314 data sheet. It input range extends to -200 mV below V- and +200 mV above V+. 

    http://www.ti.com/lit/ds/symlink/opa314.pdf

    Regards, Thomas

    PA - Linear Applications Engineering

     

     

  • 0 in reply to Thomas Kuehl
    Prodigy 20 points

    wow, that was fast. thanks for the reply i will consider these components.