JAJSGG2C October 2018 – June 2019 ADS125H02
Use an external reference by applying the reference voltage to the reference input pins and then program the reference multiplexer bits RMUXP[1:0] and RMUXN[1:0]. Values of 10b select the REFP0 and REFN0 reference input pins and values of 11b select the REFP1 and REFN1 reference input pins. The reference inputs are differential with positive and negative inputs. Follow the specified absolute and differential reference voltage operating conditions; see the Recommended Operating Conditions table. Use a 10-nF or larger bypass capacitor across the reference input pins to filter noise. The reference input current can lead to a voltage error if large reference impedances are present. When a reference impedance is present, consider the impact of the reference voltage error to the overall measurement accuracy.