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DS20006363D-page 22

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2021 - 2023 Microchip Technology Inc. and its subsidiaries

Load capacitors can be programmed from 0 pF to 23.8 pF with a resolution of 0.1875 pF that not only meets load

requirement for most crystal resonator, but also allows for fine tuning of the crystal resonator frequency. The amplifier

gain can be adjusted by selecting one of seven gain values. The series resistor is adjusted based on the selected gain.

Shunt resistor has fixed value of 500 kΩ.

In Hardware Controlled mode, the capacitive load is set at 8 pF and cannot be changed. For crystals that require higher

load, additional capacitance can be added externally as shown in Figure 4-6.

FIGURE 4-6:

Crystal Oscillator Circuit in Hardware Controlled Mode.

MCHP Device

XIN

XOU T

Crystal

C1

C2

Lo ad capacitors C1 an d C2

sho uld be as p er crystal

speci ca on