SIT8008BCF8-30N

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Programmable oscillators are usually used in applications where the required oscillator frequency either needs to be very precise, or must be adjustable after the design stage of a project. The SIT8008BCF8-30N is a versatile IC from Siemens ICs which is commonly used for this purpose, and this article shall discuss its application fields and working principle.

Application Fields and Specifications

The SIT8008BCF8-30N is a type of programmable oscillator which is dedicated for use in clock circuits such as those found in microprocessors, ASICs and other digital circuits. It combines both coarse and fine tuning into one chip and operates from a voltage supply of 3.3V to 5.5V. The oscillator runs at a frequency range of 30MHz to 40MHz, which is adjusted using an external resistive and capacitive network. The wide frequency range makes this IC a popular choice for various embedded clock applications which demand high frequency adjusting resolution with low power consumption.

Working Principle

The SIT8008BCF8-30N chip is based on a capacitive digital oscillator architecture which uses a ring-counter as the oscillator core. This ring-counter is a discrete-time feedback system which combines capacitors and resistors to generate a stable oscillatory behavior. The feedback system contains a synchronization loop, with the oscillator frequency being adjusted on this loop by the application of external resistor and capacitor values. This frequency is determined by the sum of charges in the feedback loop.

The operating frequency of the oscillator is determined by a combination of external resistors and capacitors, as well as by the Vcont pin of the chip. The Vcont pin provides an adjustable voltage to the ring-counter, which sets the frequency of oscillation. The resistance and capacitance values set the initial frequency of the oscillator, while the Vcont voltage determines the amount of frequency variation. This provides the chip with a much higher frequency resolution than available with the traditional RC oscillator architectures.

Another feature of the SIT8008BCF8-30N is its power-saving mode which allows it to reduce power consumption by up to 70%. This low power operation mode is achieved by disabling the preload capacitors in the ring-counter. The reduced amount of available charge in the feedback loop reduces the oscillator frequency, thus leading to more efficient power consumption.

Conclusion

In conclusion, the SIT8008BCF8-30N is a programmable oscillator which combines both coarse and fine tuning mechanisms into one chip. It is suitable for use in high frequency applications, and can be used to adjust the oscillator frequency with high resolution while achieving low power consumption. It is a popular choice for embedded clock applications which require frequency tuning across a wide range.

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