SIT1602BI-12-XXS-74.250000D

Frequency Stability:	±25ppm
Current - Supply (Disable) (Max):	4.3µA
Height - Seated (Max):	0.032" (0.80mm)
Size / Dimension:	0.098" L x 0.079" W (2.50mm x 2.00mm)
Package / Case:	4-SMD, No Lead
Mounting Type:	Surface Mount
Ratings:	--
Current - Supply (Max):	4.5mA
Operating Temperature:	-40°C ~ 85°C
Absolute Pull Range (APR):	--
Series:	SiT1602B
Voltage - Supply:	2.25 V ~ 3.63 V
Output:	HCMOS, LVCMOS
Function:	Standby (Power Down)
Frequency:	74.25MHz
Type:	XO (Standard)
Base Resonator:	MEMS
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

Oscillators are devices which generate a periodic, alternating waveform and are common building blocks for many circuits. They can be used to generate signals of varying frequencies, amplitude and waveform depending on the application in which they are used. The SIT1602BI-12-XXS-74.250000D oscillator is no different and is a part of this ever-popular oscillator family.

Application Field

This part is an inexpensive and reliable solution for applications such as broadcast radio, radiotelephones, and various other frequency-dependent product categories. It has been proven to be of great assistance in the design of switching regulators, PLL (Phase Locked Loop), timers, clock multipliers, clock dividers and microprocessors. Additionally, its industry standard 8-pin DIP package make it more efficient for applications with limited board space.

Working Principle

The SIT1602BI-12-XXS-74.250000D oscillator uses a high-frequency feedback circuit, composed of several passive components, to produce an oscillating electrical signal. This signal is then regulated and likely enhanced with the use of an amplifier. The amplifier has two main purposes. First, it provides additional gain or amplification, resulting in the required system output. Secondly, the amplifier acts as an active filter, allowing a quicker switch over among different frequency settings.At the heart of the SIT1602BI-12-XXS-74.250000D is an oscillator circuit. This circuit is most often composed of a quartz crystal and two capacitors. The crystal vibrates at a very stable frequency and is clamped by the two capacitors in order to maintain stable oscillation. This arrangement then serves as the basis for the rest of the circuitry in the oscillator. The other necessary components in the oscillator are the amplifier, a passive filter, and a regulator. The amplifier is the component that provides additional gain to the oscillator circuit. Depending on the oscillator, this could be implemented in several ways such as transistor, opamp, FET, or even a specialized semiconductor chip. The filter that follows plays an important role in regulating the signal that is being generated by the oscillator. It mainly serves the purpose of filtering out any unnecessary noise that may be generated by the amplifier, or generated as a part of the oscillator’s internally generated noise. Finally, the regulator component ensures that the output signal of the oscillator is well within the expected tolerance range.

Conclusion

The SIT1602BI-12-XXS-74.250000D oscillator is an inexpensive yet reliable solution for applications requiring a periodic, alternating waveform signal of a specific frequency. Its high frequency feedback circuit, composed of several passive components, and well regulated output make it ideal for broadcast radio, radiotelephone, and other similar frequency-dependent product categories. Furthermore, its industry standard 8-pin DIP package make it more efficient for applications with limited board space.

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