According the MAX 10 Analog to Digital Converter User guide:
"You can configure the Altera Modular ADC or Altera Modular Dual ADC IP core to output user-specified values in the logic simulation for each ADC channel except the TSD channel.If you enable this feature, you must provide a simulation stimulus input file for each ADC channel thatyou enable. The logic simulation reads the input file for each channel and outputs the value of the currentsequence. Once the simulation reaches the end of the file, it repeats from the beginning of the sequence. The stimulus input file is a plain text file that contains two columns of numbers:• The first column of numbers is ignored by the simulation model. You can use any values that you wantsuch as time or sequence. The actual data sequencing is based on the text rows. • The second column contains the voltage values."