Instrumentation Amplifier Gain resistor(s)

Hi. I am looking for Instrumentation Amplifiers for an application.  At this stage, we have decided a certain gain value for our Instrumentation Amplifier. The datasheet of the product mention the very precise value of gain resistors to attain certain gain value.

We haven't ordered the products yet as I am confused about whether we will be able to acquire the gain resistors ourselves (from some other manufactures) or they will come with the Instrumentation Amplifier package we will order?  Because these gain resistor values for certain gain sets are very precise which are difficult to get from manufactures. I am attaching the screenshot of AD8237 gain resistors from datasheet as reference  https://www.analog.com/media/en/technical-documentation/data-sheets/AD8237.pdf

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  • +1
    •  Analog Employees 
    on Aug 11, 2020 3:05 AM

    Hi ali,

    Thank you for considering AD8237 on your application.

    The resistor values suggested on Table 7 for the gain resistors are based on the standard values, and I think these are readily available in the market. There are a lot of articles with regards to the standard resistor values and here's one http://www.resistorguide.com/resistor-values/, I checked and the suggested resistors falls under series E96 that has a 1% tolerance as also indicated in the datasheet.

    I hope this answers your question ali.

    Best Regards,
    Dann

Reply
  • +1
    •  Analog Employees 
    on Aug 11, 2020 3:05 AM

    Hi ali,

    Thank you for considering AD8237 on your application.

    The resistor values suggested on Table 7 for the gain resistors are based on the standard values, and I think these are readily available in the market. There are a lot of articles with regards to the standard resistor values and here's one http://www.resistorguide.com/resistor-values/, I checked and the suggested resistors falls under series E96 that has a 1% tolerance as also indicated in the datasheet.

    I hope this answers your question ali.

    Best Regards,
    Dann

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