SBASAV5 December 2023 ADS1114L , ADS1115L
PRODUCTION DATA
The ADS1114L can measure one, and the ADS1115L up to four, single-ended signals. The ADS1114L can measure single-ended signals by connecting AIN1 to GND externally. The ADS1115L measures single-ended signals by appropriate configuration of the MUX[2:0] bits in the Configuration register. Figure 10-2 shows a single-ended connection scheme for the ADS1115L. The single-ended signal ranges from 0 V up to positive supply or +FS, whichever is lower. Negative voltages cannot be applied to these devices because the ADS111xL can only accept positive voltages with respect to ground. The ADS111xL do not lose linearity within the input range.
The ADS111xL offer a differential input voltage range of ±FSR. Single-ended configurations use only one-half of the full-scale input voltage range. Differential configurations maximize the dynamic range of the ADC, and provide better common-mode noise rejection than single-ended configurations.
The ADS1115L also allows AIN3 to serve as a common point for measurements by appropriate setting of the MUX[2:0] bits. AIN0, AIN1, and AIN2 can all be measured with respect to AIN3. In this configuration, the ADS1115L operates with inputs, where AIN3 serves as the common point. This ability improves the usable range over the single-ended configuration because negative differential voltages are allowed when GND < V(AIN3) < VDD; however, common-mode noise attenuation is not offered.