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Need clarification: Why the datasheet of ADN8810 says Rsn=1.6V (instead of ohms/kohms)?

I need to make a laser driver that can give current output from 0 mA to 250 mA. I checked ADN8810 datasheet and found the recommended circuit with 2 resistors (Rsn) which are having value written over them as 1.6V (instead of ohm/kohm). Is this a typo?

Also I need to ask whether the recommended circuit shown is to get 300mA only or the circuit connection stays the same for smaller current values as well? laser driver source current adn8810