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CC2510: Use of external sine wave clock

Part Number: CC2510

The CC2510 datasheet says that:

The  chip  can alternatively  be  operated with a reference  signal  from  24  to  27  MHz  (CC2510Fx) or  48  MHz  (CC2511Fx)  instead  of  a  crystal.  This input  clock  can either  be  a full-swing  digital signal  (0 V  to VDD)  or  a sine wave of maximum  1  V  peak-peak  amplitude.  The reference  signal  must  be connected  to  the XOSC_Q1  input.  The  sine  wave must  be connected to XOSC_Q1  using a serial capacitor.

Considering the sine wave input, assuming that the slightly strange requirement of "maximum 1 V peak-peak amplitude" is correct, then what is the minimum peak-peak amplitude needed for a valid sine wave input?

(My suspicion is that someone wrote "maximum" where they meant "minimum", but if not then it is necessary to also know the lowest p-p sine wave that will suffice)