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

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