SIT9005ACR2H-25NB

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Programmable oscillators are oscillators that, as their name implies, can be programmed to oscillate at specific frequencies. They are used in a variety of applications where a stable, predictable frequency is important. This can include applications like communications, instrumentation and control systems. One example of a programmable oscillator is the SIT9005ACR2H-25NB. This article will explain the application field and working principle of the SIT9005ACR2H-25NB.

The SIT9005ACR2H-25NB is a single-output Crystal-controlled Programmable Oscillator (XCC-PXO) that offers a wide output frequency range from 4 to 125MHz. It has a wide operating temperature range from -40C to +85C, making it suitable for many different environments. The output type is sinusoidal and the output frequency is programmable over SPI. The typical phase-noise at 25MHz is -106dBc/Hz at 10kHz frequency offset.

The SIT9005ACR2H-25NB is designed to maximize system performance in applications such as frequency hopping, receiver sensitivity and time-of-day accuracy. It is particularly suited for applications requiring extreme temperature stability, such as long-term frequency stability over an extended temperature range. It also provides system flexibility, as it can be easily reprogrammed with a new output frequency without any hardware modifications.

The SIT9005ACR2H-25NB has a stable and predictable crystal reference. The crystal reference oscillator consists of a parallel resonant circuit, with a capacitive load in one arm and a series resonator in the other arm. The crystal oscillator circuit is operated in a free-running mode, meaning that the output frequency is dependent on the loading of the crystal. An internal circuit monitors the available loading of the crystal and automatically adjusts the output frequency based on the loading to ensure the optimal frequency is maintained.

The SIT9005ACR2H-25NB includes an embedded microcontroller which enables the ‘programming’ of the output frequency. The embedded microcontroller has access to a 16-bit register which can be written to in order to create a programmable frequency. Output frequency is generated by counting the number of reference clock cycles. An internal prescaler can be used to multiply or divide the reference clock according to the desired output frequency. The output frequency is further regulated by an internal decimal divider in order to achieve the programmed frequency.

The SIT9005ACR2H-25NB is an ideal solution for applications that require a precisely controlled output frequency with excellent accuracy and stability. It is also suitable for applications requiring wide temperature range performance with minimal frequency drift and excellent long-term frequency stability. The programmable nature of the device allows it to be suitable for a variety of applications, making it an ideal choice for designers looking for an easy to use, accurate and stable oscillator.

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