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AD7699, Temperature measurement

Question asked by JSJ on Aug 29, 2011
Latest reply on Feb 24, 2014 by maithil

I get wrong temperature value when I read out the internal temperature sensor in the AD7699.

The environmental temperature is about 25 degrees Celsius. According to  the data sheet should the voltage be approximate 283mV.  I read out  262,5 mV (dac value 4200 with internal Vref 4.096V).  That should equals  to 4,5 degree Celsius.

I have also measured a voltage on one of the AD input
to verify that I use the AD7699 correct .  That works OK.

Can somebody help me with temperature measurements with AD7699?