SAM D21/DA1 Family

45.5.2 Crystal Oscillator

Figure 45-7. Crystal Oscillator Example Schematic

The crystal should be located as close to the device as possible. Long signal lines may cause a load too high to operate the crystal, and cause crosstalk to other parts of the system.

Table 45-5. Crystal Oscillator Checklist
Signal Name	Recommended Pin Connection	Description
XIN	Load capacitor C_LEXT⁽¹⁾⁽²⁾	External crystal between 0.4 to 30 MHz
XOUT	Load capacitor C_LEXT⁽¹⁾⁽²⁾	External crystal between 0.4 to 30 MHz

Use the equation in Crystal Oscillator Characteristics to calculate C_LEXT.
Decoupling capacitor should be placed close to the device for each supply pin pair in the signal group.

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