Hi Sean, You are correct if there were no noise involved in the conversion process. In Table 1 of the ADS1220 datasheet on page 16 you will notice there is typically 13.67uVpp of noise at a gain of 1 at 20sps. Using the calculation in equation 2 on the same page, the number of noise-free bits comes out to about 17.47 bits. This will exclude any noise external to the device (such as EMI/RFI). This will alter the result so that 1 code is now 13.43uV. You span counts would now lower to 41422 counts. This is your best case scenario. Best regards, Bob B
↧