JAJSGG2C October 2018 – June 2019 ADS125H02
The ADC incorporates current sources designed to provide excitation current to the RTD, thermistor, diode, and other sensor types that require constant-current biasing. The current sources are on the IDAC1 and IDAC2 pins. The current sources are supplied by AVDD; therefore, the operating range is 5 V to AGND. Do not expose the current source to voltages outside of this range. The full-accuracy voltage compliance range is specified in the Electrical Characteristics table. The current sources are independently programmable over the 50-µA to 3000-µA range. Figure 63 shows the associated registers to configure the current sources (see Table 39). Enable the internal reference to operate the current sources.