I am starting to use this ADC and would be glad if someone help me with following problem:
When I connect SENSE pin to VREF and VINB, VREF-VREF/2 to VREF+VREF/2 span is expected at VINA input pin. But I am getting OTR signal for VINA = VREF-0.05v and VREF+0.05v instead. (VREF pin output voltage is 1v). Bit values are 0x000 at 0.95v and 0xfff at 1.05v. although Mode pin is connected to 5v, I observe jump in output bits value around 1v input.
When I connect SENSE to GND, vref is 2v, things look better, measuring span looks correct (vref-vref/2 to vref+vref/2), but still observing jumping in output 12bit value around VINA=vref, and is not linearly increasing when sweeping voltage on VINA input.
I am using 3.3v clocks on clock input (tried 1mhz,10mhz and 60mhz). Maybe part is working incorrect with 3.3v clock s and require 5v clock signal?
Using single-ended configuration from datasheet with internal reference, internal reference also connected to VINB.