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Issue
91, February 1998
Choosing the Right
Crystal For Your Oscillator
by
Norman Bujanos
Start
•Why Quartz Crystals
• Timing Budget &
Accuracy
• Frequency
Tolerance
• Frequency
Stability
• Aging • Load
Capacitance •
Series and Parallel Resonance •
Frequency Tolerance and Load Capacitance
• AT vs. BT Cut
• Mode of Operation
•
Package Considerations •
Crystal Placement •
Crystal Clear • References
PACKAGE CONSIDERATIONS
Crystals are available in
a variety of packages. There are many metal-can configurations,
plastic packages, and surface-mount plastic.
Unlike ICs, the plastic version
is probably the most expensive. This is because the plastic
version is the metal version encapsulated in plastic.
In other words, you pay for two packages.
Handling considerations should
be the only reason to select one package type over another.
Performance is the same.
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