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
Hi Hiroyuki,
The customer is having Vin+=DC voltage and Vin-= GND. What is the value of the DC voltage? This should work if Vin+= Vref. Please take note that the AD7688 is a differential ADC, it is expecting that the input of Vin+ and Vin- is opposite with each other and also take note of common mode voltage Vref/2, which means the difference of the Vin+ and Vin- should be within the common mode voltage.
The customer may use AD7686, which is a Pseudo Diff ADC basing from the input voltage that you mentioned.
Jonathan
Dear Jonathan
Thank you very much for your reply. I recognize the choice of ADC by mistake.