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TMS570LS1114 ADC setup

Other Parts Discussed in Thread: HALCOGEN

I am experience some variation in ADC readings from board to board with the same stimulus - some read higher or lower voltages than what I read with meter at adc pin. I have experimented with different values of Cext. There is also some settings in Halcogen on enabling cap discharge rates. Are there some rules of thumb to better understand how to set these up properly?