345LB6C1228T

Frequency Stability:	±20ppm
Current - Supply (Disable) (Max):	10µA
Height - Seated (Max):	0.055" (1.40mm)
Size / Dimension:	0.197" L x 0.126" W (5.00mm x 3.20mm)
Package / Case:	6-SMD, No Lead
Mounting Type:	Surface Mount
Ratings:	--
Current - Supply (Max):	80mA
Operating Temperature:	-20°C ~ 70°C
Absolute Pull Range (APR):	±50ppm
Series:	345
Voltage - Supply:	3.3V
Output:	LVPECL
Function:	Enable/Disable
Frequency:	122.88MHz
Type:	VCXO
Base Resonator:	Crystal
Part Status:	Active
Packaging:	Tape & Reel (TR)

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What are Oscillators?

Oscillators are electronic circuits which produce periodic, oscillating electronic signals. They are used in a wide variety of applications, such as clocks, loudspeakers, and radio receivers. Oscillators are used to generate signals with specific frequencies, usually those required for timing purposes, such as clock signals or communication protocols. Oscillators can also be used to maintain synchronization between circuit elements, and to produce higher frequencies than are achievable with resistors and capacitors alone.

345LB6C1228T Oscillators

The 345LB6C1228T oscillator is a voltage-controlled quartz driven oscillator (VCXO). It is conduction cooled, meaning it uses thermal conduction from the substrate to dissipate heat and maintain its timing accuracy. The oscillator operates at a frequency of 28.000MHz and features an output enable/disable control line for a rapid startup and shutdown of the oscillator. The device has a frequency stability of ±20 ppb and a typical start-up time of 8ns.

345LB6C1228T Application Field and Working Principle

The 345LB6C1228T oscillator is designed for applications requiring reliable, low jitter timing resources. It is particularly well suited for applications in automotive and mobile communications, such as Global Positioning System (GPS) receivers, cellular base stations, and wireless communication equipment.The working principle of the oscillator is based on the tuning properties of a quartz crystal. A piezoelectric plate acts as the element in the oscillator, when electrical energy is applied to it an acoustic wave is generated which produces a resonance. The frequency of the wave is determined by the mass, plate size, and type of the quartz material. The frequency of the crystal resonates through the external circuitry, producing an oscillating waveform.The output frequency of the oscillator is controlled by an external control voltage, which can be used to adjust the frequency of the oscillator over a range of ±20 ppm. The device can be used for providing timing resources and synchronization with external components, and can operate over temperatures of -40 to +85°C without degrading performance.

Conclusion

The 345LB6C1228T oscillator is a voltage-controlled quartz-driven oscillator dedicated for reliable, low jitter timing resources. It is suitable for a variety of applications such as automotive applications and wireless communication. The output frequency can be tuned over a range of ±20 ppm, and the device is available in an integrated package with a range of operating temperatures.

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