FA-238 24.0000MD-C

Series:	FA-238
Part Status:	Active
Type:	MHz Crystal
Frequency:	24MHz
Frequency Stability:	±30ppm
Frequency Tolerance:	±30ppm
Load Capacitance:	18pF
ESR (Equivalent Series Resistance):	60 Ohms
Operating Mode:	Fundamental
Operating Temperature:	-40°C ~ 85°C
Ratings:	--
Mounting Type:	Surface Mount
Package / Case:	4-SMD, No Lead
Size / Dimension:	0.126" L x 0.098" W (3.20mm x 2.50mm)
Height - Seated (Max):	0.028" (0.70mm)

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Crystals: FA-238 24.0000MD-C Application Field and Working Principle

Crystals have become increasingly popular as they have become more accessible and their applications increasingly important. FA-238 24.0000MD-C is a type of crystal that is widely used in devices, especially those requiring precise and reliable frequency and timing control. This article will look into the application field and working principle of this type of crystal. FA-238 24.0000MD-C crystals are primarily used in the radio frequency domain, such as cellphones, radios and satellite communication systems, as they can provide stable frequencies with low phase noise and low jitter. This type of crystal also finds applications in medical imaging systems, spectroscopy, arbitrary waveform generator, gps receivers, frequency counters, and Test and Measurement equipment. These crystals work based on a piezo-electric effect in which an applied electrical field produces mechanical strain in the crystal and vice versa. A thin sapphire or quartz wafer is used in this type of crystal, which is then cut in specific angles and dimensions. This cut crystal is then subjected to a mechanical as well as electrical process to generate the desired properties. The crystal’s main element is AT-cut or SC-cut quartz crystal, which is embedded in a high-strength stainless steel container and then prepared for oscillation. A copper pattern is then placed on the top, which is used to contact the various elements and external components. The copper pattern is covered with resin to secure and protect the embedded crystal wafer. The outer side of the crystal is then fixed to a metal housing via an "O" ring, which helps in stabilizing the temperature and humidity of the environment. The oscillation of the crystal depends on the frequency of the oscillation circuit and the mechanical properties of the crystal. The oscillation frequency is determined by measuring the FC-16 frequency counter. The electrical properties of the crystal are determined by testing the current, voltage and the dielectric constant. The former two parameters can be determined from the frequency counter measurement and the latter from a bridge technique or other equivalent method. The crystal oscillators are tested for long term reliability and long term parameter variation under various environmental conditions such as temperature and moisture.In conclusion, FA-238 24.0000MD-C crystals find application in many modern communication and medical imaging systems. They work based on piezoelectric effect which causes an applied electric field to produce a mechanical strain in the crystal which causes it to oscillate at a certain frequency. They are embedded in a stainless steel container and undergo various tests for long term reliability and parameter variation under different environmental conditions.

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