I have four channel version of AD7606 and after approx. one week of work in my application the outputted data reading freezing or not avaiable.
After restart if I move finger on the top of package of working device the outputted data are broken again or not avaiable.
I did some mistakes during design period:
- used 2 layer board and with multiple GND connections (common AGND, DGND) around
- joined AVCC with DVCC together
- unused channels are not placed to GND
- manufactured 30pcs of PCB with this application
However I still cannot imagine why (reason) is device destroyed after such period of time. The PCB change is a big issue now, do you have an
advice how to fix this issue? Please do not take to a details related to measurement accuracy - what I need right now is to have a functional device!
Schematic is attached.