SIT9005ACU1G-18DM

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Programmable oscillators are special types of oscillators, which have the ability to maintain a desired and specified frequency of operation. The SIT9005ACU1G-18DM is a type of programmable oscillator proposed by SiTime Corporation to serve the electronics industry. It is a robust temperature compensated oscillator (TCXO) and has numerous advantages, such as a wide frequency range and low power consumption. This article explains the application field and working principle of the SIT9005ACU1G-18DM.

Application Field

The SIT9005ACU1G-18DM is an ideal programmable oscillator that is used in data communication, wireless, defense and aerospace, cellular and satellite communication, telecommunications, instrumentation and metering applications. Its wide frequency range from 1 KHz to 500 MHz enables it to serve multi-band applications such as Wi-Fi, WCDMA, LTE and GNSS.

The SIT9005ACU1G-18DM offers industry-leading power consumption and low noise levels, offering near-silent performance in low-noise environments. Furthermore, this temperature-controlled oscillator is highly stable and robust over temperature, making it highly suitable for operation over the operational temperature range of -40ºC to +85ºC.

Working Principle

The SIT9005ACU1G-18DM includes a TCXO (temperature compensated crystal oscillator) that consists of a high quality quartz-crystal enclosed in a hermetically sealed package. This quartz crystal has electrodes on each side and is housed between two electrodes with a small gap in the middle. This gap serves as the variable capacitor. Depending on the frequency and the specified operating temperature, the electrical impedance is adjusted by the variable capacitor.

In order to reduce the temperature influence on the frequency, the crystal is housed in a special thermal chamber, which helps to maintain the frequency stability for a given temperature range. The crystal can thus be kept at a temperature that is close to its optimal operating temperature, eliminating any drift over temperature. This in turn ensures that the SIT9005ACU1G-18DM produces a stable signal with low drift.

The frequency of the oscillator is then proportional to the crystal’s resonant frequency, which can be tuned by adjusting the variable capacitor. The SIT9005ACU1G-18DM can be programmed to maintain different frequencies within its specified operating temperature range. This enables it to be used in frequency applications that require different frequencies at different times, such as in data communication, where different frequencies are used for uplink and downlink.

In addition to its frequency tuning capabilities, the SIT9005ACU1G-18DM boasts excellent reliability and stability, making it suitable for long-term use in mission-critical applications. It is also energy efficient, consuming only 8 mW (typical power consumption) and comes with a wide range of mounting options for seamless installation in different applications.

Conclusion

The SIT9005ACU1G-18DM is a robust temperature-controlled programmable oscillator designed for applications that require precise frequency management. It has a wide frequency range from 1 KHz to 500 MHz and is highly stable over temperature, making it suitable for operation over the operational temperature range of -40ºC to +85ºC. In addition, it has excellent noise levels, low power consumption and a wide range of mounting options. This makes it a highly reliable, energy-efficient and versatile programmable oscillator for multiple applications.

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