I'm using AD7190 with a 4-wire load cell to build a pressure acquisition board. From ADI reference design(CN0102), I understand that connect sense+- lines of a 6-wire load cell to the ref+- pin of AD7190 create a ratiometric configuration which eliminates the need for a precision reference. However, I only have 4-wire load cell. The CN0102 points out that due to lack of the sense line, 4-wire system is not completely ratiometric.
I want to achieve relative high precision and >100Hz date rate, so I config the AD7190 to 150Hz output data rate.
Whether a precision reference is needed for my 4-wire load cell application? If I use a precision reference, is my performance giong to be better or worse?