Crystal Oscillator

គណនា Crystal Oscillator — Load Caps, Resonance, Pullability, Drive Power

Load Capacitors

គណនា C1, C2 សម្រាប់ Crystal

Crystal Frequency:

Load Capacitance CL (pF):

ធម្មតា: 12.5 pF, 18 pF, 20 pF (តាម datasheet)

Stray Capacitance (pF):

ធម្មតា: 3–5 pF (PCB trace + pin capacitance)

Load Capacitors ត្រូវការ

C1 = 26.00 pF

C2 = 26.00 pF

Standard Value:27 pF

Actual CL:18.50 pF

Pierce Oscillator:

C1 = C2 = 2 × (CL − Cstray)

Rf ≈ 1MΩ (MHz) / 10MΩ (32kHz)