SI4468-7 Datasheet, PDF (37/57 Pages) Silicon Laboratories – Highly configurable packet handler

Si4468/7
Utilizing the on-chip temperature sensor and suitable control software, the temperature dependency of the crystal
can be canceled.
A TCXO or external signal source can easily be used in place of a conventional XTAL and should be connected to
the XIN pin. The incoming clock signal is recommended to have a peak-to-peak swing in the range of 600 mV to
1.4 V and ac-coupled to the XIN pin. If the peak-to-peak swing of the TCXO exceeds 1.4 V peak-to-peak, then dc
coupling to the XIN pin should be used. The maximum allowed swing on XIN is 1.8 V peak-to-peak.
The XO capacitor bank should be set to 0 whenever an external drive is used on the XIN pin. In addition, the
POWER_UP command should be invoked with the TCXO option whenever external drive is used.
Rev 1.0
37