Delta sigma ADC low accuracy problem | Cypress Semiconductor
Delta sigma ADC low accuracy problem
I'm kind of new in pSoc and one of my first projects is creating some kind of a probe in pSoc 5LP, using an ADC_delsig component
the problem is that the output of the ADC is very far from the Vref input I'm inserting.
the design I have built is made of 3 components : an ADC_delsig , a LCD, and a Vref.
the Vref is the input of the ADC (the other one is the component Vssa), and the output of the ADC is converted into uV and displayed in the LCD
if I'm inserting an input of 1.024V the output is around 1,022,000 uV (0.2%)
and if I'm inserting an input of 0.256V the output is around 251,000 uv (2% error !!!!)
can somone explain me why the second output error is so big ?