SIT1602BI-21-18E-66.000000E

Frequency Stability:	±20ppm
Current - Supply (Disable) (Max):	4mA
Height - Seated (Max):	0.032" (0.80mm)
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):	4.1mA
Operating Temperature:	-40°C ~ 85°C
Absolute Pull Range (APR):	--
Series:	SiT1602B
Voltage - Supply:	1.8V
Output:	HCMOS, LVCMOS
Function:	Enable/Disable
Frequency:	66MHz
Type:	XO (Standard)
Base Resonator:	MEMS
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Overview

SIT1602BI-21-18E-66.000000E oscillators are designed to maintain a very stable output frequency over a wide range of environmental conditions. The device is optimized for low phase noise and its capability for adjustable frequency operation. It is applicable for many applications where easy programming of output frequency and excellent frequency stability are needed.

Application Field

SIT1602BI-21-18E-66.000000E oscillators are commonly used in frequency synthesizers, digital communication systems, portable radio equipment, radar systems and navigation devices. This product is suitable for applications requiring low phase-noise oscillators with fast start-up and excellent long-term stability over wide temperature ranges. This oscillator is an ideal solution for designing high performance frequency synthesizer platforms for frequency hop TDMA systems applications in space and radar communication systems.

Working Principle

The oscillator utilizes a special low phase noise integrated circuit IC, which is designed with an advanced crystal control circuit. A programmable output frequency is generated and the frequency divided down circuitry is used to divide the frequency to a programmable frequency. The output of the frequency division is then further refined by a Multi-Phase Lock Loop (MPLL). The MPLL consists of a low-noise, reserved loop oscillator, which is designed to generate two identical outputs that are 180° out of phase to each other. The outputs from the MPLL are then compared by a Phase Frequency Detector and the resulting signal is fed back into the MPLL. This process allows the oscillator to lock onto a signal that is frequency and phase coherent to the reference signal. The board is built on an improved SiTek design and utilizes several high performance technologies for frequency synchronization. The board is designed to optimize the oscillator for optimum performance with the usage of an external low noise voltage controllable tuning element. This combination allows for a high accuracy, low noise output, and a wide lock range in the desired frequency range. The performance characteristics of the oscillator are achieved by using advanced compensation algorithms and an on-board measurement system. This system tests various performance parameters such as cycle-by-cycle jitter, phase noise, and start-up time. With the combination of advanced compenstation and measurement system, the board is able to achieve excellent performance while at the same time maintaining low power consumption.

Conclusion

The SIT1602BI-21-18E-66.000000E oscillator is an ideal choice for applications requiring a low phase-noise oscillator. It is designed for applications requiring fast start-up, excellent long-term stability over wide temperature ranges, and easy programming of output frequency. With the usage of external components, the performance parameters of the oscillator are improved, resulting in low noise and a wide lock range in the desired frequency range.

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