ADC Input Problem

RE: ADC Input Problem

Rob Garner — Tue, 14 Dec 2021 18:35:04 GMT

Also, have you verified that all four ports of the ADC are configured as anaolog inputs (so no pullups or pulldowns enabled, etc).

RE: ADC Input Problem

Rob Garner — Tue, 14 Dec 2021 18:32:19 GMT

Hi Nipri

Was there a software change between the first and second version that specifically had something to do with the 9160?

Rob

RE: ADC Input Problem

nipri — Tue, 14 Dec 2021 01:07:15 GMT

Thanks Rob! I will measure the continuity as you suggested. The voltages I measured were on the end caps of R10. Also, the circuit works when I remove R10 and replace it with a jumper soldered across the pads in its place. Will report my findings tomorrow. Using Altium BTW.

RE: ADC Input Problem

Rob Garner — Tue, 14 Dec 2021 00:53:15 GMT

Try removing R10, then measuring for continuity between the one pad of R10 and the output of the opamp (pin 7). Try the same for the other resistor pad to the top pad of C7. Depending on the CAD tool you used for the layout, traces are sometimes not connected 100%, so there could be a hairline gap in the trace somewhere that creates an open circuit.