we have designed a weight scale module .
We are using ad7799 as ADC convertor for this system.
We have strange data from ad7799 :
These are what we captured from ad7799 :
|free nois bit||Sampling rate|
as you see 4.7hz and 8.3hz are like datasheet but in other sample rate we are far from datasheet !
specially in 50hz the output is exactly sinusoidal !!
this the output data in 50hz sampling:
and here is my schematic :