Intel® MAX® 10 Analog to Digital Converter User Guide

ID 683596
Date 5/04/2021

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2.1.6. ADC Voltage Reference

Each ADC block in Intel® MAX® 10 devices can independently use an internal or external voltage reference. In dual ADC devices, you can assign an internal voltage reference to one ADC block and an external voltage reference to the other ADC block.

There is only one external VREF pin in each Intel® MAX® 10 device. Therefore, if you want to assign external voltage reference for both ADC blocks in dual ADC devices, share the same external voltage reference for both ADC blocks.

Intel recommends that you use a clean external voltage reference with a maximum resistance of 100 Ω for the ADC blocks. If the ADC block uses an internal voltage reference, the ADC block is tied to its analog voltage and the conversion result is ratiometric.