SWAS034A February 2017 – May 2021 CC3120
The CC3120R device also incorporates an internal crystal oscillator to support a crystal-based fast clock. The crystal is fed directly between WLAN_XTAL_P (pin 23) and WLAN_XTAL_N (pin 22) with suitable loading capacitors.
Figure 8-11 shows the crystal connections for the fast clock.
Section 18.104.22.168.1 lists the WLAN fast-clock crystal requirements.