-URGENT- AD7688 analog input is instability.

Hi

We're facing a issue that the analog input is instability below.

CH4 is IN+. CH3 is SDO.

Actually the driver amp is OPA197 (Ti), we recommend ADA4084-1 instead of Ti.

But the customer say if the instability is not improved within this week, he may use ADS8863 (Ti) instead of AD7688.

The input+ is DC voltage and the input- is GND as single input.

Could you please give me any advice.

Thank you very much in advance.

OPA197

http://www.ti.com/product/OPA197?keyMatch=OPA197&tisearch=Search-EN-Everything

ADS8863

http://www.ti.com/product/ADS8863?keyMatch=ADS8863&tisearch=Search-EN-Everything

 

Regards,

Hiroyuki