ADS1220: "Data rate" value effect on internal sensor temperature measurement error

Hi Emilien,

The noise characteristics will follow the same behavior as the normal analog muxed inputs.  The noise tables start on page 16 of the ADS1220 datasheet.  Keep in mind that the internal reference is used for the internal temperature sensor measurement and that the temperature sensor result is 14-bit as opposed to 24-bit.  So in most cases you should not see an impact on the temperature sensor result by using different data rates while operating in Normal mode.  In Turbo mode there will be some noise added to the measurement at the higher data rates.

As to the data in the electrical characteristics table for the internal temperature sensor, these values relate specifically to 20sps.  This is the lowest noise setting for the ADS1220 in normal mode and is also the data rate used to trim the temperature sensor accuracy.  As I just stated, I would not expect significant differences for most data rates.

Best regards,

Bob B