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Because the 24-MHz crystal oscillator is used as a reference to generate the RF signal, any crystal frequency deviation is directly transferred to deviation of the RF signal. For example, 10 ppm leads a deviation in RF carrier frequency of 10 ppm. Select a crystal with performance within the limits of the RF specifications.
• For 802.15.4 (Thread/ZigBee®), the maximum deviation in carrier frequency is limited to ±40 ppm (see [1]).
• For Bluetooth Low Energy, the limit is ±40 ppm (see [2]).
