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Load Cell Amplifier ( Large Temperature Range )

ismail cetinkaya
Prodigy 40 points

Other Parts Discussed in Thread: INA826, INA128, INA333, ADS1230

I have designed a load cell amplifier with three opamp in amp. I use this amplifier in baby incubator project. I have sensor module inside incubator and my amplifier circuit is in the module. Module temp can be 45-50C some times because of settled temp of incubator. So , my amplifier out changes +-20mV( x201 gain ) range ( about 200 grams ). I think , i need an inst. amp with 10 ppm/C , 10nV/root(Hz) , 0.5uVpp , 0.5uV/C and very good CMR. So , i need voltage reference ic near properties and 14-16 bit ADC. Please give me info , which ics can i use? Thanks for your answers.

  • 0
    Guru 21975 points

    Ismail,

    There are many factors that could influence the selection of components for your application. Offset voltage drift is likely to be an important specification. The gain drift you have cited (10ppm/'C is less likely to be critical. I recommend that you consider INA826, INA333, and INA128. The REF50xx series of voltage references would be a good choice.

    I recommend that you post the same question on the precision data converter forum as these experts have more experience with converter questions.

    Regards, Bruce.

  • 0 in reply to Bruce Trump
    Prodigy 40 points

    Bruce,

    Thanks for your recommendation. Do you recommend ADS1230 for my system.

    Regards,

  • 0 in reply to ismail cetinkaya
    Guru 21975 points

    Ismail,

    The ADS1230 is a good possible selection. Again, I suggest that you post this question on the precision data converter forum. They have extensive experience with this type of selection and may have insight on other possible better choices.

    Regards, Bruce.