SIT8008ACB3-18S

Programmable oscillators are used in multiple applications where precision in the frequency of the oscillator is needed. The SIT8008ACB3-18S is a programmable oscillator designed for use in high-frequency, high-stability oscillator applications. It is capable of producing a precision frequency of up to 18GHz, with a superior phase noise performance and low jitter. This article will discuss the application field and the working principle of the SIT8008ACB3-18S.

Application Field

The SIT8008ACB3-18S is designed for applications such as test and measurement equipment, microwave radios, wireless infrastructure, base station and communication systems. Its superior frequency stability helps ensure accurate measurement results or stable wireless transmissions. Furthermore, its low jitter performance is ideal for clocking signals in digital systems such as DSPs, FPGAs and ASICs. It can also serve as a reference clock for oscillators used in ultra-wideband systems and instrumentation.

Working Principle

The SIT8008ACB3-18S consists of an input stage, an oscillator, and an output stage. The input stage accepts an incoming 3.3V or 5.0V supply voltage and provides drive current to the oscillator. The oscillator consists of a voltage-controlled oscillator (VCO) and a digital-to-analog converter (DAC). The DAC is used to set the frequency of the oscillator by changing the voltage supplied to the VCO. Finally, the output stage provides the necessary current buffer and power amplifier to drive the load connected to the output pins.

The oscillator frequency is determined by the input clock frequency, the DAC setting, and a set of on-chip programmable dividers. The frequency range of the SIT8008ACB3-18S is between 90 MHZ and 18 GHz, with a frequency stability range of ±25 ppm. This stability is achieved through the on-chip temperature stabilization circuit, which ensures that access to the oscillator remains temperature-stable throughout its operating temperature range.

The SIT8008ACB3-18S is also equipped with a Reference Output Lock Detect (ROLD) pin, which detects when the output frequency is locked to the input reference clock. This feature can be used to simplify circuitry by eliminating the need for an external clock-loss detection circuit. Furthermore, the SIT8008ACB3-18S can be programmed via an SPI interface, and supports bus speeds up to 7 MHz.

Conclusion

The SIT8008ACB3-18S is a programmable oscillator designed for high-frequency, high-stability applications such as test and measurement, wireless infrastructure, and ultra-wideband systems. It has a wide frequency range of up to 18 GHz, and a precise frequency stability of ±25 ppm.It is programmable via an SPI interface, and features a Reference Output Lock Detect pin for detecting clock loss on the output.Overall, the SIT8008ACB3-18S is an excellent choice for applications requiring precision oscillation at high frequencies.