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Output range problem for AD8497

Hi. I am using AD8497 for K-Type thermocouple measurement. I have given supply of +5v and 0V. and Ref voltage of +0.5V. My input signal ranges from -2.0mV to 70mV. I get output signal only for input signal upto 40mV. Please suggest schematic for measuring the complete range of my input signal.

Below is the schmatic I have used.

Thanks and Regards,

Kumar

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  • Hi Kumar,

    Are you able to increase your supply voltage?  The AD8497 has a gain of about 122.4V/V - so at a 5V supply you will be hitting the rail around a 40mV input.  You can increase the +VS supply to get more range.  Just note that the Absolute Max is +/-18V supplies,  or 36V between the supplies - I don't think you'll run into that.  

    Let me know if that helps.

    Regards,

    Jordyn

Reply
  • Hi Kumar,

    Are you able to increase your supply voltage?  The AD8497 has a gain of about 122.4V/V - so at a 5V supply you will be hitting the rail around a 40mV input.  You can increase the +VS supply to get more range.  Just note that the Absolute Max is +/-18V supplies,  or 36V between the supplies - I don't think you'll run into that.  

    Let me know if that helps.

    Regards,

    Jordyn

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