Other Parts Discussed in Thread: OPA320
Right now I'm using ADS8332 to sample 8 different voltage signals. The schematic is as below. Input use 200ohm, 100nF filter network. External reference is 4.1V, VA is 5V, VBD is 3.3V.
When I remove all the 200ohm resistors, I find that all the analog input pins from IN0 to IN7 all has very stable DC 1.6V. I don't know where this voltage comes from. Is it generated by the ADC itself? Could you please help to answer this? Thanks a lot.
And also, I have a question about the unused pins of ADC's analog inputs. Should I just terminated the unused pins to ground with capacitor?