Looking for a QUAD Instrumentation Amp- AD620

Hello,

I am designing a Load cell for a school project. This requires me to implement Full Wheatstone bridge circuits, and I need an amplifier in order to amplify my output voltages! I am looking for a QUAD version of the AD620 instrumentation amp. Does any have any suggestions? Thank you!!!

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  • Hi Giulia,

    The parts that I mentioned before are all suitable to your application, the AD8426, AD8224 and AD8222. You just have to set your gain at 1000 to amplify the 4.2 mV output from your bridge circuit to 4.2V. Also, you need to take into account the input common mode voltage level of the instrumentation amplifier. In your circuit that would be at 5.55 V. If you'll use single supply operation, it is highly recommended to set the reference voltage at Vs/2.

    You may also try using our new tool, the in-amp common mode range tool: Instrumentation Amplifier Tool - Common Mode vs. Output Voltage (Diamond Plot). This tool will help you simulate the output of the in amp depending on your supply voltage, reference voltage, gain, common mode input and differential input voltage.

    If you have any more concerns, please let me know.

    Regards,

    Jay

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  • Hi Giulia,

    The parts that I mentioned before are all suitable to your application, the AD8426, AD8224 and AD8222. You just have to set your gain at 1000 to amplify the 4.2 mV output from your bridge circuit to 4.2V. Also, you need to take into account the input common mode voltage level of the instrumentation amplifier. In your circuit that would be at 5.55 V. If you'll use single supply operation, it is highly recommended to set the reference voltage at Vs/2.

    You may also try using our new tool, the in-amp common mode range tool: Instrumentation Amplifier Tool - Common Mode vs. Output Voltage (Diamond Plot). This tool will help you simulate the output of the in amp depending on your supply voltage, reference voltage, gain, common mode input and differential input voltage.

    If you have any more concerns, please let me know.

    Regards,

    Jay

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