Quartz Crystals Glossary
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MHz
Abbreviation for "MegaHertz," describes the frequency of a crystal or oscillator in terms of millions of Hertz (cycles per second). A frequency denoted as "10.0 MHz" is the same as frequency of 10,000,000 Hertz (cycles per second).
Motional Capacitance
Abbreviated as "Cm" or "C1", it is the parameter associated with a quartz crystal unit, illustrates the electronic equivalence of the mechanical elasticity of the unit.
Motional Inductance
Abbreviated as "Lm" or "L1", it is the parameter associated with a quartz crystal unit, illustrates the electronic equivalence of the mechanical mass of the unit.
OEM
Abbreviation for "Original Equipment Manufacturer."
Operating Temperature Range
Temperature range at which the crystal's characteristics are guaranteed.
Oscillation Mode
A quartz crystal is designed to vibrate either on its fundamental frequency or one of its overtones. Deciding which oscillation mode to use becomes critical as frequency becomes higher. Fundamental vibration mode normally can go as high as 40MHz; although it may be more precise, cost can be an issue. Using overtones for high frequencies can be cost savings, however, it might not be as precise as desired.
Overtone
Odd numbered multiple of the fundamental frequency.
Package
Holder used to contain the crystal blank.
Parabolic Temperature Curve
BT-cut and Tuning Fork crystals' frequencies follow a parabolic curve over temperature. The frequency will change or decrease as the temperature goes above or below the turnover temperature.
Parallel Resonant
Oscillator circuit is normally uses a crystal unit that is designed to operate with a specified value of load capacitance. Resulting in a crystal frequency higher than the series resonant frequency, but lower than the true parallel resonant frequency.
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