SIT9005ACU1G-30DM

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Programmable Oscillators are widely employed in computing-related electronic products to provide timing or synchronization services. One of the most widely used types is the SIT9005ACU1G-30DM. In this article, we will examine the application field and working principle of this oscillator.

Application Field

The SIT9005ACU1G-30DM is a low-cost alternative to the more expensive high-precision crystal oscillators commonly used in PC audio, video, and multimedia applications. It is designed to provide highly accurate time-keeping and synchronization services while occupying minimal board space. This makes it ideal for use in small-form-factor applications.

The SIT9005ACU1G-30DM is also suitable for use in embedded systems and can be used as a clock generator for communication interfaces such as USB, UART, and Ethernet. It also offers some level of voltage tolerance, making it suitable for applications with more stringent requirements.

Working Principle

The SIT9005ACU1G-30DM is an oscillator circuit operating on the principle of dynamic negative resistance. Its core element is a pair of insulated gate transistors, which form the differential amplifier stage of the circuit. The transistors are connected such that one supplies resistive current while the other operates as an active load with negative resistance. This loop of alternating positive and negative resistance creates a sustained oscillation.

The SIT9005ACU1G-30DM is capable of generating up to 30MHz of clock frequency, depending on the supply voltage. The oscillator consumes very low power and is capable of operating over a wide range of temperature, from -40 to +85 degrees Celsius. It also provides a high level of shock and vibration protection, making it suitable for robust applications in industrial environments.

The oscillator can be programmed to generate a range of steady-state frequencies, or alternately to scan through a range of frequencies at predetermined intervals. The range and frequency of the scanning output can be adjusted by changing the control voltages of the transistors.

Conclusion

In conclusion, the SIT9005ACU1G-30DM oscillator provides a low-cost and highly reliable source of clock and synchronization signals for PC audio, video, multimedia, embedded and industrial applications. Its small form factor and wide range of voltage tolerance make it ideal for many small-form-factor applications, while its dynamic negative resistance circuitry ensures low power consumption and improved performance over a wide temperature range.

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