The ADS1262 and ADS1263 require an analog power supply (VAVDD, VAVSS) and digital power supply (VDVDD). The analog power supply can be bipolar (for example, VAVDD = +2.5 V, VAVSS = –2.5 V) or unipolar (for example, VAVDD = 5 V, VAVSS = 0 V). The digital supply (VDVDD) range is 2.7 V to 5.25 V. The digital supply voltage determines the digital I/O logic levels. Keep in mind that the GPIO logic levels (AIN3-AINCOM) are referenced to the analog supply voltage and may be different from the digital I/O logic level. The analog and digital sections of the ADC are not internally isolated and the grounds for analog and digital must be connected together. Output voltage ripple produced by switch-mode power supplies may interfere with the ADC resulting in reduced performance. Use low-dropout regulators (LDOs) to reduce the power-supply ripple voltage produced by switch-mode power supplies.