Description
Intel® Quartus® Prime Software will give a "Critical Warning (16248) Pin xxx is placed too close to Analog to Digital Converter (ADC) pins. I/O pins placed too near to ADC pins will cause performance degradation on ADC sampling" when you assigned IO pins located in IO Bank 1A, 1B, 2, 3, 5, 7 and 8 using Intel® MAX® 10 FPGA device with E144 package.
Resolution
You need to follow restriction rules as published in Intel® MAX® 10 General Purpose I/O User Guide Table 16 and Table 18 to avoid this Critical Warning message.