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strange behave of ad7799

Question asked by meerkat on Oct 25, 2015
Latest reply on Nov 4, 2015 by JellenieR

Hello

 

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 bitSampling rate
18.8 4.7hz
17.8    8.3hz
15.716.9hz
10.850hz
11.5123hz

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:

i.bmp

and here is my schematic :

Capture.PNG

 

Best Regards

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