SIT8008BIR7-25E

Frequency Stability:	--
Current - Supply (Disable) (Max):	4.2mA
Height:	0.031" (0.79mm)
Size / Dimension:	0.079" L x 0.063" W (2.00mm x 1.60mm)
Package / Case:	4-SMD, No Lead
Mounting Type:	Surface Mount
Ratings:	--
Current - Supply (Max):	4.2mA
Spread Spectrum Bandwidth:	--
Operating Temperature:	-40°C ~ 85°C
Frequency Stability (Total):	±20ppm
Series:	SiT8008B
Voltage - Supply:	2.5V
Output:	LVCMOS
Function:	Enable/Disable
Available Frequency Range:	1MHz ~ 110MHz
Programmable Type:	Programmed by Digi-Key (Enter your frequency in Web Order Notes)
Type:	XO (Standard)
Base Resonator:	MEMS
Part Status:	Active
Packaging:	Tube

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Programmable Oscillators: SIT8008BIR7-25EProgrammable oscillators are electronic devices used in many electronic systems for generating predetermined waves. The SIT8008BIR7-25E two-port oscillator is one of such oscillators, which is has great demand in the radio and communications industries. This paper hopes to provide a better understanding of this oscillator’s application field and working principle.Application FieldThe SIT8008BIR7-25E oscillator is primarily used for communication systems including wireless base station applications, frequency hopping and GPS systems, satellite communication systems, and other related applications. It is capable of supporting frequencies ranging from 2.45 to 2.5 GHz, and has excellent noise performance at -123 dBc/Hz, as well as very low harmonic distortion of -75 dBc/Hz.The SIT8008BIR7-25E is a great choice for system designers looking to implement the requirements of IEEE802.11a and b standards for their communication systems, including for wireless base station applications. In addition, it is small enough that it can be used for portable applications and in mobile devices, so it can be used in any application where space is at a premium.Working PrincipleThe SIT8008BIR7-25E is a voltage-controlled oscillator (VCO) that uses a symmetric parallel-connected LC resonator circuit to achieve a frequency hopping or FM (Frequency Modulation) signal generation. It has an output range of 2.45-2.5 GHz and requires a supply voltage of between 2.5 V and 3.5 V.The oscillator uses an LC resonator circuit to generate oscillation with a desired frequency. In this case, a 12_pF capacitor and 5_pF inductor are used to resonance within the desired range. This resonator is then connected to two transistors, and biasing to the transistors is achieved through two bias pins.When the oscillator is operating, the voltage across the LC resonator is monitored by a comparator, which is connected to the output of the oscillator. When the voltage exceeds the predetermined threshold, the comparator switches the output from low to high. This is how the oscillator is able to generate a frequency hopping or FM signal.When the supply voltage applied to the VCO is changed, the output frequency will also change. This allows the frequency of the oscillator to be tuned to the desired range with high accuracy, making it ideal for use in communication systems.ConclusionThe SIT8008BIR7-25E is a highly reliable, cost effective and space efficient two-port oscillator that is designed to meet the IEEE802.11a and b standards. It is commonly used in modern communication systems to generate precise frequency hopping or FM signals. The working principle behind this device is the use of an LC resonator to generate oscillations, and a comparator to monitor the voltage across the LC to produce the desired output.

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