This query is related to my old post: ADC outputs random values to constant input
I made further tests, and still struggling. The reason I made a new post is, the query is different. I am using FPGA (Spartan6) to sample the signal. The PMODS can handel a maximum of 3v3. I expected the output of ADC to be below as the input. Also with multimeter I get the same voltage level. But I found in the datasheet (http://www.ti.com/lit/ds/symlink/ads7822.pdf) Page 4 - DIGITAL INPUT / OUTPUT - Logic öevels: Voh = 3V5 (min). That means its from3V5 to 5V. Is my understanding clear?