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Regarding AD8226 used in CN0251

Question asked by PrateekJain-28889 on Jun 1, 2014
Latest reply on Jun 2, 2014 by Walt_Kester

Hi,

The AD8226 has very high impedance input stage but for floating voltage source like a Thermocouple, the AD8226 IN+ and IN- inputs must have a bias current path (i guess 10megaOhm or 1megaOhm) as per the AD8226 datasheet. In CN0251 a bias current return path seems to be missing. Is it required. In my design i m using  10megaOhms to GND at IN- and 10megaOhms to IN+ for AD8226 ,is my design correct.Kindly throw some light on my attached design as well.

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