Part Number: ADS1256
Hi,
we have an 8-channel ADS acquisition chip ADS1256.
Eight channels are all used as single-ended input.
As described on page 14 of the data sheet, the AINCOM foot is not grounded for a single input, and can be 2.5V or AVDD.
So on our circuit board, AINCOM is connected to 2.5V, but the actual test found that AD acquisition had problems.
If the AINCOM foot is grounded, the acquisition will be normal.
It is inconsistent with what data sheet described.
Could you help me explain that AINCOM needs special software configuration when it connects to 2.5V?
What is the conversion formula between AD value and voltage when connected to 2.5V?
thanks,