The MAX11300 ports can be programmed to support different I/O voltage levels. For example each ADC-configured port can be programmed for one of four input voltage ranges: 0 to +10 V, -5 to +5 V, -10 to 0 V,  and 0 to +2.5 V. Note that in order to support these voltage levels the supply ranges AVDDIO and AVSSIO must be set appropriately.