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OPA2140: About the unbalance supply operation of op amp

chao zh
Intellectual 650 points
Part Number: OPA2140
Other Parts Discussed in Thread: OPA145, , OPA2145

Hi,all

In order to save one supply, I plan to use the +5V and the -15V which are available,as the supply of opa2140/opa145. So i want to know whether there are some problems with this usage.In my design,the input signal is less than 1V  and the maximum output is 3V.  Looking forward your reply.

Thanks.

  • 0
    TI__Genius 10850 points

    Hello Chao,

    There should be no problem with using the OPA2140 or OPA2145 with asymmetric supplies as long as the input common-mode and the output voltage stays within its linear range as defined with respect to supplies. You can find the input common-mode voltage and output range in the datasheet.

    OPA2140 - 

    • input common mode range: (V-) - 0.1 to (V+) - 3.5. So for your supplies, that is -15.1V to 1.5V
    • output swing: (V-) + 0.2 to (V+) - 0.2. So for you supplies, that is -14.8V to 4.8V

    -Tamara

  • 0 in reply to Tamara M Alani
    Intellectual 650 points

    Hi  Tamara，

    Thank you very much.