(Preliminary)
PL611s-18
0.5kHz-125MHz MHz to KHz Programmable Clock
T M
Crystal Tuning Circuit
Series and parallel capacitors used to fine tune the crystal load to the circuit load .
Crystal
Cst
XIN
1
Cpt
8
Cpt
XOUT
CST
– Series Capacitor, used to lower circuit load to match crystal load . Raises frequency
offset. This can be eliminated by using a crystal with a Cload of equal or greater value than the
oscillator.
CPT
– Parallel Capacitors , Used to raise the circuit load to match the crystal load. Lowers
frequency offset .
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Rev 2/23/07 Page 7