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analog to digital conversion

Question asked by rahul krishna on Mar 19, 2015
Latest reply on Mar 26, 2015 by Martin35804

Hi All,

One requirement of mine wanted to read very low voltages from around 6mv from a sensor. The Vref is 5V and using S12x ADC in 12 bit mode. My problem is the ADC count is fluctuating and at lower voltages it goes to "0" and then a value of 30 etc. I am confused, I have seen some of the previous posts regarding the same problem but could not get a clear idea of how i have to solve this problem. At higher voltages also i see the last two bits varying something like if it 24.34 24.38 24.40 and etc. How should be the properties of the input source to achieve stable output?

 

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