SIT8208AC-GF-25S-28.636300X

Frequency Stability:	±10ppm
Current - Supply (Disable) (Max):	70µA
Height - Seated (Max):	0.032" (0.80mm)
Size / Dimension:	0.106" L x 0.094" W (2.70mm x 2.40mm)
Package / Case:	4-SMD, No Lead
Mounting Type:	Surface Mount
Ratings:	--
Current - Supply (Max):	33mA
Operating Temperature:	-20°C ~ 70°C
Absolute Pull Range (APR):	--
Series:	SiT8208
Voltage - Supply:	2.5V
Output:	LVCMOS, LVTTL
Function:	Standby (Power Down)
Frequency:	28.6363MHz
Type:	XO (Standard)
Base Resonator:	MEMS
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Oscillators

Oscillators are key components in a wide range of electronic applications, providing a reliable, accurate source of repetitive signals. In this article, we will discuss the application fields and working principle of SIT8208AC-GF-25S-28.636300X, a type of low phase noise oscillator.

Application Field

SIT8208AC-GF-25S-28.636300X is widely used for wireless infrastructure applications. Its excellent noise-free performance, high accuracy and stability make it a popular choice for base station applications, such as 4G/5G base station, small cell base station, DTV and HDTV reception station. It can also be used in other wireless communication system, such as GPS, CDMA, Bluetooth, etc. In addition, it’s also suitable for some medical and industrial instrument applications.

Working Principle

SIT8208AC-GF-25S-28.636300X uses the Pierce crystal oscillator circuit as its core circuit. It works by driving a quartz crystal with a constant square wave voltage, which, due to its mechanical properties, resonates at a fixed frequency. The frequency will not be affected by temperature changes, vibration, and electricity variation, so the output tends to be highly stable. The quartz crystal is connected between the emitter and the collector of an NPN transistor. The base of the transistor is driven by a sine wave voltage from the feedback loop circuit. The auto-push-pull effect caused by the feedback loop allows the crystal to generate a sine wave at a very low phase noise. In addition, by adjusting the base voltage, the frequency of the output sine wave can be adjusted over a certain range. The frequency range and the stability of the oscillator can be further optimized by adding temperature compensation and frequency trimmer circuits.

Conclusion

SIT8208AC-GF-25S-28.636300X is a type of low phase noise oscillator with a wide range of applications in wireless infrastructure, medical instrument and industrial instrument. By understanding its working principle, which is based on the Pierce crystal oscillator circuit and a feedback loop, engineers and designers can better assess its suitability for their applications.

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