CDC421A156RGET

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CDC421A156RGET is a high performance clock generator or phase lock loop (PLL) used in telecommunications and satellite communications systems. This integrated circuit, manufactured by TI, is the industry standard for ultra-low jitter, digitally programmable synthesized clock generators.

The CDC421A156RGET operates in an integrated circuit package containing two stages: an integrated phase detector and an analog system containing a low-noise voltage controlled oscillator (VCO) and a frequency divider. The two stages work together to provide an output frequency which is the product of two user-selectable reference frequencies.

The phase detector monitors the phase difference between the input reference signals and the PLL\'s internal VCO signal. When the phase difference between the reference signals and the VCO signal is zero, the phase detector produces no output. Otherwise, the phase detector produces an output proportional to the phase difference. This output is fed to the VCO whose frequency is adjusted until the phase difference is zero. As a result, the output frequency of the PLL is locked to the reference frequency and the phase noise of the clock signal is significantly reduced compared to other clock sources.

The CDC421A156RGET has a wide range of applications in communications systems, such as wireless base station systems, digital audio broadcasting (DAB) systems and subscriber modules for global system for mobile communications (GSM) networks. It is also used in satellite communications systems such as satellite radio links and multimedia broadcasting (MBMS) links. The CDC421A156RGET can be used to generate the RF carrier signals for these systems as well as the timing and synchronization signals for digital data transmission. Additionally, it can also be used in the digital television industry for generating system timing signals.

In conclusion, the CDC421A156RGET is a high performance clock generator or phase lock loop that is designed for use in telecommunications and satellite communications systems. Its integrated phase detector and VCO enable it to generate an output frequency that is the product of two user-selectable reference frequencies. This makes it an ideal choice for applications requiring ultra-low jitter and digitally programmable clock generation.

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