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ADS5444-EP: About the CLK voltage range of the AD converter

Part Number: ADS5444-EP

About the CLK voltage range of the AD converter
I would like to use ADS 5444.
In the data sheet, the absolute maximum rating is written as "Clock input to GND - 0.3 V to AVDD + 0.3 V". However, according to Figure 16 Single Ended Clock in single ended CLK example, a negative voltage is input It seems to be like it. Clock input to GND - 0.3 V to AVDD + 0.3 V Where does it refer?