Delta Sigma Noise | Cypress Semiconductor
Delta Sigma Noise
Hi Every One !
I would need some help regarding noise generated for the Delta sigma in single end configuration.
As you can see in the schematic as result of array scanning I am geting pulses which votage depend of the pressure applied to every cell in the array. My Vdda is 3.3 v . The issue is that with no pulse, ( checked with osciloscope) there is noise that you can watch in the graphic display picture.
The only way to avoid that is using a PGA before the Delta sigma..
I cannot undestan that. !!!!
And even using a PGA, I need to filter trough code , like high pass filter values above 0x80, wich represent almost a half of the ADC range.
I woul appreciate very much any help.