SIT9005ACT2H-25DG

Frequency Stability:	±20ppm, ±25ppm, ±50ppm
Height:	0.030" (0.76mm)
Size / Dimension:	0.126" L x 0.098" W (3.20mm x 2.50mm)
Package / Case:	4-SMD, No Lead
Mounting Type:	Surface Mount
Ratings:	--
Current - Supply (Max):	6.5mA
Spread Spectrum Bandwidth:	±0.905%, Center Spread
Operating Temperature:	-20°C ~ 70°C
Frequency Stability (Total):	--
Series:	SIT9005
Voltage - Supply:	2.5V
Output:	LVCMOS
Function:	--
Available Frequency Range:	1MHz ~ 141MHz
Programmable Type:	Programmed by Digi-Key (Enter your frequency in Web Order Notes)
Type:	SSXO
Base Resonator:	MEMS
Part Status:	Active

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Programmable Oscillators

A programmable oscillator is a type of electronic component that produces an output frequency which can be user-defined via microprocessor or other digital device. Users can select from a range of frequencies, determine the mode of operation, or design new artificial or customized waveforms. The SIT9005ACT2H-25DG is a type of programmable oscillator that combines the advantages of Digital-Controlled Oscillator (DCO) solutions with a high performance analog discipline oscillator technology.

Application Field of SIT9005ACT2H-25DG

The SIT9005ACT2H-25DG provides solutions for wide range of frequency requirements with a wide frequency range of 300 kHz to 500 MHz. This device can be used in a variety of applications, including:

• Radio frequency applications, such as consumer products, base stations, and communications systems;
• Timing and synchronization solutions for consumer end products, including digital TVs and DVD players;
• Multi-channel audio and video capture applications, such as CCTV systems;
• Automotive and Industrial sensors;
• Test and Measurement equipment.

The SIT9005ACT2H-25DG is also suitable for applications where accuracy, stability and low jitter are important, such as communications networks, broadcast and professional audio systems, base-station timing and control, and military radio applications.

Working Principle of SIT9005ACT2H-25DG

The SIT9005ACT2H-25DG uses an analog-controlled oscillator (ACO) technology, supplemented by a digital controller for higher accuracy and freedom from environmental factors such as supply voltage and temperature variations. This hybrid approach allows for greater accuracy and stability of the output frequency. The ACO circuit produces a base-frequency reference signal and the digital controller controls the frequency by introducing a digital modulation signal to the ACO. The frequency control word is programmed via the SPI/I2C compatible interface, thereby allowing the oscillator to be programmed to any frequency within the range. The output of the SIT9005ACT2H-25DG is a very high quality sinusoidal signal with excellent spectral purity and low phase noise performance. The phase noise profile of the output signal is highly dependent on temperature and supply voltage, so the digital controller actively compensates for these variations. The combination of DAC and temperature compensation circuits creates a very stable signal with ultra-low phase noise and jitter. The SIT9005ACT2H-25DG also features an integrated, low-power PLL using an external reference crystal. This PLL allows the device to be used in clock recovery and frequency synthesis applications.

Conclusion

The SIT9005ACT2H-25DG is a versatile programmable oscillator ideal for use in radio frequency applications, timing and synchronization applications, multi-channel audio and video capture applications, automotive and industrial sensors and other test and measurement equipment. It utilizes an ACO technology supplemented by a digital controller, which allows for higher accuracy and stability of the output frequency. The digital controller actively compensates for variations in temperature and supply voltage, creating a very stable signal with ultra-low phase noise and jitter. Additionally, the PLL capability allows the device to be used in clock recovery and frequency synthesis applications.

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