SIT8208AC-G1-18E-75.000000Y

Frequency Stability:	±20ppm
Current - Supply (Disable) (Max):	30mA
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):	31mA
Operating Temperature:	-20°C ~ 70°C
Absolute Pull Range (APR):	--
Series:	SiT8208
Voltage - Supply:	1.8V
Output:	LVCMOS, LVTTL
Function:	Enable/Disable
Frequency:	75MHz
Type:	XO (Standard)
Base Resonator:	MEMS
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Oscillators

Oscillators are useful electronic devices whose output signals repeat at a regular frequency. The SIT8208AC-G1-18E-75.000000Y is a voltage-controlled crystal oscillator (VCXO) specifically designed for communications applications. It features a small 0.25 mm QFN package and a Frequency range of 75.000000 MHz to 156.250000 MHz, facilitating a wide variety of signal specifications.

Application Field

The SIT8208AC-G1-18E-75.000000Y can be used for telecommunications to ensure long range signals with accurate timing. In addition, it is suitable for GPS applications, WLAN, and WiMAX due to its excellent phase noise performance, low frequency drift, and ability to deliver synchronization for wideband operation. Its wide voltage range (1.8V, 2.5V, 3.3V) makes it a suitable option for portable telecommunication products with very low power consumption.

Working Principle

Oscillator circuitry is the key component of any timing circuit and the SIT8208AC-G1-18E-75.000000Y is no exception. It features a typical voltage-controlled oscillator configuration that includes an active device and an external resonator, either a quartz crystal or SAW filter. The active device for the SIT8208AC-G1-18E-75.000000Y is an integrated circuit that is designed to work at high frequency and convert the input voltage into an oscillating signal.The quartz crystal resonator, which is built to resonate at a given frequency, is then connected to the active device. A capacitor is connected in parallel to the resonator to reduce the sensitivity to environmental parameters, such as temperature and humidity. The voltage-controlled oscillator consists of an amplitude comparator, voltage-controlled amplifier, and an inverting amplifier in which the output signal of the amplifier is switched by the comparator and then fed into the next stages of the oscillator.The frequency of the oscillator can be precisely adjusted through the frequency control voltage, typically in the range of 0-5VDC depending on the oscillator. The frequency control voltage is used to vary the capacitance or resistance of the resonator. A higher voltage will increase the capacitance, which will increase the resonance frequency, while a lower voltage will have opposite effect. The specific frequency is determined by the combination of the oscillator’s amplifier and the external quartz crystal or SAW filter. SIT8208AC-G1-18E-75.000000Y covers a frequency range of 75.000000 MHz to 156.250000 MHz.The SIT8208AC-G1-18E-75.000000Y also features excellent phase noise performance, low frequency drift and minimal jitter. It has an output level of 5 mW CMOS and a rise and fall time of 10 and 15 nanoseconds, respectively. The oscillator also provides excellent temperature stability across its operating temperature range (-40 - 85 ºC).

Conclusion

The SIT8208AC-G1-18E-75.000000Y VCXO is a reliable and cost effective option for signal application, offering excellent phase noise performance, low frequency drift and synchronization for wideband operation. Its small 0.25mm QFN makes it suitable for portable telecommunication products and its wide voltage range provides very low power consumption. The device can be used for telecommunications, WLAN, WiMAX and GPS applications, with excellent temperature stability across its operating temperature range (-40 - 85 ºC).

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