SIT9120AI-1BF-25E155.520000E

Frequency Stability:	±10ppm
Current - Supply (Disable) (Max):	35mA
Height - Seated (Max):	0.032" (0.80mm)
Size / Dimension:	0.126" L x 0.098" W (3.20mm x 2.50mm)
Package / Case:	6-SMD, No Lead
Mounting Type:	Surface Mount
Ratings:	--
Current - Supply (Max):	69mA
Operating Temperature:	-40°C ~ 85°C
Absolute Pull Range (APR):	--
Series:	SiT9120
Voltage - Supply:	2.5V
Output:	LVPECL
Function:	Enable/Disable
Frequency:	155.52MHz
Type:	XO (Standard)
Base Resonator:	MEMS
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Oscillators

Oscillators are widely used in various fields and are crucial components for electronic systems. As a typical oscillator, the SIT9120AI-1BF-25E155.520000E is designed to generate an oscillating signal with high reliability and accuracy for timing control. This article will describe its application field and working principles.

Application Field

The SIT9120AI-1BF-25E155.520000E oscillator mainly applies for telecommunications and digital clocks, watches, and other timing applications. It can also be used in data communication and storage devices like disk drives, modems, and routers. ATRs and computer motherboards also benefit from its precise operation.

Working Principle

The SIT9120AI-1BF-25E155.520000E consists of two fundamental components: the oscillator itself and the first voltage-controlled amplifier (VCO). The oscillator is a classical quartz crystal oscillator, with a tuning voltage in a range of 0 to 5 V, and the frequency range of the oscillator is 32 KHz to 1GHz. It is provided with an oscillator start pin, a clock output pin, and a parallel load enable pin. When the external bias voltage is applied to the oscillator Start pin, the quartz crystal oscillator begins to oscillate, producing periodic voltage fluctuations. The output frequency of the device is determined by the capacitance and resistance of the external wiring and the type of quartz crystal used. The output signal from the oscillator is amplified and the pulse width is controlled via the VCO. The VCO is composed of an operational amplifier and a series of timing elements. Through the voltage comparator, the VCO compares the voltage levels of the logic signal to the reference voltage. The operational amplifier then adjusts the current flow to match the reference voltage. When the current generated matches the reference voltage, the voltage comparator will switch its state, resulting in a logic output signal. The timing of each switching state is determined by the capacitance and resistance of the timing elements. Finally, the voltage-controlled oscillator output is fed into a frequency divider, where the output frequency of the VCO is evenly divided, resulting in an output of a desired frequency.

Conclusion

The SIT9120AI-1BF-25E155.520000E oscillator is a reliable and precise timing tool ideal for a wide range of applications, including telecommunications, digital clocks, watches, data communication and storage devices, ATRs, and computers. By employing a classical quartz crystal oscillator as the core, along with a voltage-controlled amplifier, the device can produce accurate and periodic voltage fluctuations. In addition, a frequency divider is used to ensure a desired frequency signal is output for optimal control.

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