The ADC converts voltages applied to the ADC-configured ports. The ADC can operate in single-ended mode or in differential mode, by which any two ports can form a differential pair. The ADC is a 12-bit, low-power, successive approximation ADC, capable of sampling a single input at up to 400 ksps. The ADC’s conversion rate can be programmed to 400 ksps, 333 ksps, 250 ksps, or 200 ksps. The default conversion rate setting is 200 ksps. 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. The ADC uses the internal ADC 2.5 V voltage reference, the external ADC voltage reference, or, in some cases, the DAC voltage reference. The ADC voltage reference can be selected on a port-by-port basis. If ‘n’ ADCs are used within a design the effective sample rate is 400 ksps divided by ‘n’ where the bandwidth is shared between the multiple ports.