SIT9005ACU1H-28SH

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Programmable Oscillators provide frequency stability and accuracy over temperature, voltage and time variations. The SIT9005ACU1H-28SH is one of the latest programmable oscillators to hit the market and has been designed to meet the most demanding applications while still providing a cost effective solution. In this article, we will examine the application fields and working principle of the SIT9005ACU1H-28SH.

The SIT9005ACU1H-28SH is an ASIC-based fully-featured, high-performance programmable oscillator for frequency synthesizers and time/frequency synchronization applications. It is optimized for both low-power/ fast settling and low-jitter performance. The key application areas covered by the SIT9005ACU1H-28SH include radio communication transceivers, radio-controlled clocks, mobile phone base stations and other communications platforms.

In terms of basic design, the SIT9005ACU1H-28SH integrates a phase-locked loop (PLL) and Phase Detectors (PD) based on sigma-delta mixer architecture. The PLL utilizes charge-pump current and handle out a high-quality low-jitter clock. The programmable features of the oscillator provide information to the PLL, allowing it to adjust its output frequency according to the programmed settings. The PD also uses this information to detect phase errors, effectively damping any disturbances which might cause jitter or instability in the PLL output.

The SIT9005ACU1H-28SH has a frequency range of 10-200MHz and programmable output frequency settings with a resolution of 0.001%. The internal output frequency change is via direct mode, bypass mode and forward direction linear interpolation. The output can be phase-shifted inside a range from 0 to 360°. The EFC (External Frequency Control) provides tracking of external clock reference frequency using I2C interface. In terms of basic design, the SIT9005ACU1H-28SH utilizes a 100 MHz crystal and a low-voltage differential signaling (LVDS) line driver.

The SIT9005ACU1H-28SH also offers a programmable SPI interface with read/write access for configuration. This interface is used for controlling the device, providing soft control for the frequency, output signal, and other settings. SPI is suitable for both short-term and long-term applications, with each register setting stored in non-volatile memory, so that the device can be powered off and powered up again without any loss of configuration settings.

In addition to its programmable features, the SIT9005ACU1H-28SH also provides a comprehensive suite of features designed to make operation and integration simple and straightforward. This includes an integrated logic control interface, a temperature compensated crystal oscillator (TCXO) with ±2ppm stability at 25°C, a wide supply voltage range of 1.2V to 3.3V, and a low power consumption of only 35 mA.

Overall, the SIT9005ACU1H-28SH is an excellent solution for high-performance and wide-ranging frequency synthesizers and time/frequency applications. With its advanced features and high-quality built-in components, it is sure to meet the needs of any application where precision timing is a must.

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