Hi,
I am working with the ADC of the TMS320F28335. It is set to work in simultaneous mode, with a 25MHz ADC clock, CPS = 0 and ACK_PS=4 (to be more than 160ns, as the errata says).
It is programmed to use the external reference (AD 3020) and this is also the input for an ADC channel of the DSP in order to calibrate online (as recommended in spraad8a.pdf)
Just to test the channels, I have set all the channels to measure this external reference value. I can see differences up to 65 ADC units between them. I have taken maximum, minimun and mean value of each channel and there is an offset of this 65 ADC value. Also, the values in one channel can vary up to 16 ADC units.
Does anybody else meet this issue? What could be the cause of such wrong behaviour? Any recommendation?
Regards,