638L156H3I2T

Frequency Stability:	±50ppm
Current - Supply (Disable) (Max):	--
Height - Seated (Max):	0.079" (2.00mm)
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):	66mA
Operating Temperature:	-40°C ~ 85°C
Series:	638
Voltage - Supply:	2.5V
Output:	LVDS
Function:	Enable/Disable
Frequency:	156.257812MHz
Type:	XO (Standard)
Base Resonator:	Crystal
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Oscillators: 638L156H3I2T Application Field and Working Principle

Introduction

Oscillators, defined in terms of electrical engineering, are electronic circuits that have the purpose of generating a periodic signal waveform. Oscillators are broadly grouped into two categories, based on whether their output signal is a voltage or a current. Oscillators are widely used in applications such as generating digital timing pules, providing clock and synchronization signals, producing tones and alarms, providing radiofrequency and servo control, and a variety of more specialized functions.In this text, we will focus on the 638L156H3I2T Oscillator, focusing on its application field and working principle.

Application

The 638L156H3I2T Oscillator is a low power oscillator and voltage controlled oscillator designed mainly for applications that require low power consumption. It is suitable for use in 4G/LTE, 3G/UMTS, WiMAX, DSL, DECT, Bluetooth, ZigBee, and other wireless communication systems. This oscillator operates over a frequency range of 75MHz to 6GHz and features excellent low phase noise and low power consumption. The 638L156H3I2T Oscillator offers an excellent balance of performance and power consumption, and is well suited for use in applications such as microwave transceivers, base stations, WiMAX, and GPS. It also features a small footprint, low power mode, and low EMI capability. The oscillator is highly integrated, with on-chip power management that offers high efficiency and low bill of materials (BOM) cost.In addition, the 638L156H3I2T Oscillator is suitable for use in medical and industrial applications, such as frequency generation, signal distribution, timing, and amplitude control. It can be used to generate pulses for medical imaging, medical monitor synchronization, and remote sensing systems, as well as for waveforms that are used in robotics, automation, industrial control, and HVAC systems.

Working Principle

The 638L156H3I2T Oscillator works on a CMOS (Complementary Metal Oxide Semiconductor) architecture, designed to offer both high frequency stability and low power consumption. The oscillator is based on a voltage-controlled oscillator (VCO) and a phase-locked loop (PLL) circuit, which form the basic oscillating architecture.The PLL circuit consists of two essential components, a phase-frequency detector (PFD) and a voltage-controlled oscillator (VCO) working in tandem to generate the desired output frequency. The first component of the PLL, the PFD, receives two input signals, the reference signal and the VCO signal. The reference signal is a square wave with a frequency set by an external frequency control or a voltage-controlled crystal oscillator (VCX). The VCO signal is generated by the second component of the PLL, the voltage-controlled oscillator.The phase-frequency detector then compares the two input signals and controls the Voltage Controlled Oscillator by using an error signal and closed-loop feedback. The VCO converts this error signal into an output at the desired frequency, and the PLL then maintains this frequency stable over a wide temperature range and stresses changes. Further, this output maintains frequency stability even in the presence of external perturbations, such as component aging, supply-voltage variations, temperature changes, and other factors that may affect the stability and jitter of the oscillator.The 638L156H3I2T Oscillator has an output frequency range of 75MHz to 6GHz and is designed to operate at a low voltage of 0.9V and low current of 15mA supply. It is also designed to enable low power reverse Bluetooth coexistence, with a maximum power dissipation of 250mW. Furthermore, it has an ultra-low phase-noise of -150dBc/Hz.

Conclusion

In conclusion, the 638L156H3I2T Oscillator is a low power, voltage controlled oscillator designed primarily for wireless communication systems and applications requiring low power consumption. It operates over a wide frequency range and features excellent low phase noise and low power consumption. Various features of the 638L156H3I2T Oscillator make it suitable for a variety of applications, including wireless communication systems, microwave transceivers, medical and industrial applications, and more. Its working principle is based on a voltage-controlled oscillator and a phase-locked loop circuit, which provide frequency stability over a wide temperature range and external perturbations.

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