Hello,
I need to use ADS131E04 in order to read three accelerometer outputs. The single-ended signals range from 0.5 to 4.5 V nominal, but taking tolerances into account they can reach voltages as low as 0.37 V or as high as 4.63 V.
I think to use something like REF5025 for the reference input.
My questions are:
- can I use the internal opamp to buffer the reference output, or should it be better to use OPA350 (suggested in the REF50xx data sheet)? Why?
- I think that for the INN inputs I have to use a 2.5 V constant signal. Now I think of two possible solutions: 1) I can use the reference buffered output for all the inputs (reference + all INN); 2) I can use a voltage divider from the 5 V AVDD, with two identical resistors (hopefully not too small, so that I can avoid to draw too much current), and buffer it with an op amp to the INN inputs. Which solution is better? Or is there a third solution which can be even better?
Thanks in advance.
Stefano
