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Original question:

ADS131M08: Simultaneous sampling ADC selection for strain measurements

ADS131M08: Does ADS131M08's input impedance affect the bridge measurement?

Wenwei Qiao
Prodigy 120 points
Part Number: ADS131M08

Hi, Dale Li:

I read your post ADS131M08: Simultaneous sampling ADC selection for strain measurements.

What about the 300K differential input impedance on ADS131M08? Does it affect the bridge measurement?

Thanks.

-WQ

  • 0
    TI__Mastermind 35600 points

    Hi Wenwei,

    Bridge resistance is typically less than 3kΩ, 120Ω, 350Ω, and 1kΩ are the most common values for a bridge. They are small comparing with 330kΩ input impedance of ADS131M08, also a system calibration is usually done, so it will not have any significant impact for the measurement. The following app note can be a good reference for you:

    A Basic Guide to Bridge Measurements

    Regards,

    Dale