MC145170DT2

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The MC145170DT2 is a phase-locked loop (PLL) clock generator, a type of frequency synthesizer, used for generating a stable, low-jitter output clock from an input clock of any frequency. As such, it\'s a reliable and highly accurate device that is commonly used in many different types of applications, including synchronous serial communications, as well as audio and video systems.

Introduction

The MC145170DT2 is a double-frequency clock generator with a large number of features. It provides a wide frequency range that supports both low-frequency applications and the high-frequency applications in large metropolitan areas. The Double PLL technology eliminates the need for a loop filter and results in significantly better clock jitter performance. It is a cost-effective solution for stable clock generation, as well as for generating numerous types of clock signals for various applications.

Application

The MC145170DT2 is used in a wide range of applications, including synchronous serial communications, audio and video systems, telecommunications systems, wireless networks, chip/system simulations, and FPGA/CPLD based designs. It is well suited for telecommunications services requiring low jitter, such as T1 systems, as well as 802.11b wireless systems. It is also used in many audio and video systems, such as video broadcast systems, for generating stable and accurate clocks for audio and video encoding/decoding functions.

The MC145170DT2 is also used in a variety of chip and system simulations, as precision synthesizers are often needed when simulating complex systems. It is also used in FPGA/CPLD based designs, since these devices require accurate and stable clock sources for reliable performance.

Working principle

The MC145170DT2 is a phase-locked loop (PLL) clock generator. This device has two independent phase detectors and two cascaded frequency synthesizers which provide a wide frequency range and good jitter performance. The device contains a divide-by-1/2 or divide-by-1/4 frequency divider that can be used to divide the input clock frequency. The output clock frequency of the MC145170DT2 is determined by a set of programmable parameters, such as the frequency of the input clock and the frequency of the output clock.

The circuit employs a digital phase-locked loop (PLL). This circuit is made up of two components: an analog phase-locked loop (APLL) and a digital logic circuit, normally referred to as a Limiter Logic Element (LLE). The APLL is used to convert the input clock to a series of square waves, each of which represent one cycle of the input frequency. The Limiter Logic Element is used to detect the square waves and generate a stable output clock frequency that is synchronized with the input clock.

The APLL generates a voltage-controlled oscillator (VCO) that is synchronized to the input clock by a phase detector. The VCO is configured to generate a frequency that is a multiple of the input frequency. The Limiter Logic Element is then used to ensure that the output clock frequency is an exact multiple of the input frequency. This is done by dividing the output frequency by the set of parameters previously programed into the device.

Conclusion

The MC145170DT2 is a reliable and highly accurate device used for generating a stable and low-jitter clock output from an input clock of any frequency. Its double-PLL technology eliminates the need for a loop filter, resulting in significantly better clock jitter performance. Its wide frequency range and excellent jitter characteristics make it an ideal choice for many types of applications, from synchronous serial communication to audio and video systems.

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