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INA333: Use for wheatstone bridge strain sensor

Prodigy 130 points

Replies: 2

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Part Number: INA333

We are developing a wearable device where we need two independent wheatstone bridge strain gauge circuits - one to measure skin resistance (average 0.5K ohms resistance) and other to have a strain gauge sensor (120 ohms). We need a low power with programmable gain. We were looking at OPA2333 / LPV812 / INA333

Can we use two channel amplifier to use two independent strain gauges with Vref?

Which are the best suited amplifiers and respective Vref chips?

2 Replies

  • vivek plawat

    Part Number: INA333

    We are developing a wearable device where we need two independent wheatstone bridge strain gauge circuits - one to measure skin resistance (average 0.5K ohms resistance) and other to have a strain gauge sensor (120 ohms). We need a low power with programmable gain. We were looking at OPA2333 / LPV812 / INA333

    Can we use two channel amplifier to use two independent strain gauges with Vref?

    Which are the best suited amplifiers and respective Vref chips?

    Or shall I use INA333 and a multiplexer like TS3a24159 to use both the strain gauges with the same amplifier?

  • In reply to vivek plawat:

    Hi Vivek,

    Thank you for your post. I can help you.

    It would be helpful to know a bit more about your application. For each bridge (500ohm and 120ohm), can you answer the following?:

    • What is the excitation voltage?
    • What is the expected input differential voltage range?
    • How much gain do you need?
    • What is the expected output voltage of the INA or OPA?
    • What supplies are available?
    • Do you need to measure both sensors simultaneously?

    INA333 is a great choice for bridge sensor amplification owing to its high precision and low power operation.

    -Tamara 

    -Tamara Alani
    Learn more about IAs here.

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