sparkfun Qwiic 12-Bit ADC Hook-Up Manual page 5

Depending on the settings for the multiplexer (MUX) in the ADS1015, the analog voltage readings (or conversions
on the ADC) will be either for 4 single-ended inputs or 2 differential pairs.
Pin Label Configuration Options
Single-Ended
AIN
0
Differential Inputs: AIN1 or AIN3 w/ Programmable Comparator
Single-Ended
AIN Differential Ref. w/ Programmable Comparator
1
Differential Input: AIN3 w/ Programmable Comparator
Single-Ended
AIN
2
Differential Input: AIN3 w/ Programmable Comparator
Single-Ended
AIN Differential Ref. w/ Programmable Comparator
3
On-board 10kΩ Potentiometer
Note: For high accuracy measurements, input impedance should be taken into consideration. Additionally,
any noise from the power supply to the ADC will be passed on to the output measurements.
Potentiometer
Annotated image of input connections on board.
Example of attaching inputs through screw terminals. Click to enlarge.
Click to enlarge.