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AD623 using

I'm now using AD623, single power supply +12V, need to convert 0~5V output signal into 0~10V, but now can only get a maximum of 7.5V output signal instead of 10V. The attachment is the circuit diagram, can you help me check if there's any mistake with the circuit design?

Thanks in advance.

Best Regards,
Shawn Chen

  • Hi Shawn,

    You are operating at absolute maximum ratings, which is not specified in the datasheet for its performance and also in doing so stresses the part that can cause damage to the part. This also can shift parametric performance.

    The part is only spec'd at maximum +5V or 10V single supply. Also, if you operate your device at this range you will not be getting the 10V output as the part is not rail to rail and has a headroom at the output.

    I see that you only wanted to amplify your signal to 2 and a simple op amp can do the job. May I know what your system requirements are so I can suggest you a better part for your application?

    Regards,
    Goz

  • Hi Gauzz

    My transmitter can provide 0~5V output signal, but I need to amplify the voltage signal 2 times larger. Do ADI have any other amplifier suitable for?

    Thanks in advance.

    Best Regards,
    Shawn Chen

  • Hi Shawn,

    We have a lot of op amps that can be of use to your application. I see that you are using a single supply on your application and your input will touch the ground. Rail to rail op amps should be used. I have attached the parametric table of all the rail to rail op amps you can use. You can play around with the tool to properly choose which parameters are most important in your application.

    Rail-to-Rail Op Amps
    https://www.analog.com/en/parametricsearch/11095#/p2839=1.1|10&p2840=12|140

    Regards,
    Goz