Maximum voltage clarification on nrf52 analog pins

[jgartrel]

The datasheet for the nrf52832 specifies two key constraints:

1. I/O pin voltage max VDD + 0.3V, min -0.3V
2. The AIN0-AIN7 inputs cannot exceed VDD, or be lower than VSS.

It seems logical that one would need to not exceed the Vf of the protection diodes for the pad, but I don't understand what drives the second constraint: "The AIN0-AIN7 inputs cannot exceed VDD, or be lower than VSS".

For example if VDD = 2.5V, is it OK to have a pin voltage of 2.52V for a SAADC input (AIN0-AIN7)?

Any clarification you can bring to this question would be greatly appreciated.

Thanks in advance,

James