SIT9002AI-18H25SK

Frequency Stability:	±50ppm
Current - Supply (Disable) (Max):	10µA
Height:	0.031" (0.79mm)
Size / Dimension:	0.276" L x 0.197" W (7.00mm x 5.00mm)
Package / Case:	6-SMD, No Lead
Mounting Type:	Surface Mount
Ratings:	--
Current - Supply (Max):	84mA
Spread Spectrum Bandwidth:	±2.00%, Center Spread
Operating Temperature:	-40°C ~ 85°C
Frequency Stability (Total):	--
Series:	SiT9002
Voltage - Supply:	2.5V
Output:	LVPECL
Function:	Standby
Available Frequency Range:	1MHz ~ 220MHz
Programmable Type:	Programmed by Digi-Key (Enter your frequency in Web Order Notes)
Type:	XO (Standard)
Base Resonator:	MEMS
Part Status:	Active
Packaging:	Bulk

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Programmable Oscillators: SIT9002AI-18H25SK Application field and Working Principle

Programmable oscillators are devices with programmable features and reversible operating characteristics, allowing them to be adapted to a wide range of applications. The ability to closely control oscillator parameters makes them well suited for a variety of applications with varying requirements. One of the popular programmable oscillators is the SIT9002AI-18H25SK. This article explores the application field and working principle of this device.

Application Field of SIT9002AI-18H25SK

The SIT9002AI-18H25SK is a frequency-programmable oscillator used in consumer and military applications. It is designed to provide a wide frequency range (1 Hz up to 25 MHz) with an accuracy of ±25 ppm. With its few external components, it is easy to use and is a cost-effective solution for consumer and military applications. This oscillator combines a temperature-compensated MOS oscillator, phase-locked-loop (PLL) circuitry, and frequency programming logic in a single chip. It can be used in applications such as communications systems, ranging from basic modems to complex spread spectrum communications systems, or as frequency reference clock in a variety of electronic equipment. In addition, it can also be used to provide the necessary reference clock generator to an FM sound-processing board.

Working Principle of SIT9002AI-18H25SK

The working principle of the SIT9002AI-18H25SK is based on a temperature-compensated MOS oscillator coupled with a phase-locked-loop (PLL) circuit. Together, they provide a reliable output frequency, even with changing ambient temperatures. The MOS oscillator is configured with a voltage-controlled-oscillator (VCO) and the frequency of the VCO is adjusted to match the desired frequency output. The PLL circuit uses the desired output frequency to stabilize the VCO frequency, ensuring a stable output frequency.The frequency of the SIT9002AI-18H25SK can be programmed by connecting an external resistor and/or programming voltage to the chip. When programming the oscillator, it is important to select the proper resistor in order to achieve the desired frequency. Different types of programmable resistors and capacitors can be used for different frequency ranges. The output frequency can also be adjusted using a programming voltage.

Conclusion

The SIT9002AI-18H25SK is a programmable oscillator designed to suit a variety of applications. Its combination of a temperature-compensated MOS oscillator and a PLL circuit provides a stable output frequency and can be programmed with an external resistor and/or programming voltage. It is suitable for various applications in the consumer and military sectors, such as communications systems and frequency reference clock generators.

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