CDCEL949PWG4

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The CDCEL949PWG4 is an integrated IC (Integrated Circuit) designed for use in applications related to Clock/Timing. Specifically, it is designed as a Clock Generator, Phase-Locked Loop (PLL), Frequency Synthesizer. The device is composed of two independent quadrature PLLs (Phase-Locked Loops) and two reference circuits.

The primary function of the CDCEL949PWG4 is to generate periodic clock signals and to provide support for the synchronizing of data communications by tracking and locking onto the incoming data packet signals. The two integrated PLLs within the device enable the generation of stable, high-quality clock signals, which are the foundation of any data communications system. The device supports up to four clock sources, enabling a variety of data communication applications to be done. It is packaged in a thin, yet robust 32-lead package which is ideal for both surface-mount and through-hole mounting needs.

The PLL within the CDCEL949PWG4 works by using a reference input signal and a pair of PC-type resistors to create a dual-loop architecture. The first loop is known as the Low-Frequency Loop (LFL), whose primary function is to determine the VCO center frequency and bandwidth. The second loop is known as the High-Frequency Loop (HFL), whose primary purpose is for fine-tuning and stabilizing the VCO center frequency. Both the LFL and HFL loops use the same reference signal, which is the incoming data packet signals, to control the VCO. The VCO frequency is then used to generate the output clock signal from the PLL.

The CDCEL949PWG4 also includes an integrated reference circuit, which allows for the device to be used as a stand-alone clock source for systems that employ data synchronization protocols. The reference circuit consists of temperature-compensated oscillators (TCOs) and controllers. It allows the output clock frequency to remain stable over varying environmental conditions. The reference circuit also eliminates the need for an external reference input signal, which further reduces the cost of the design.

The CDCEL949PWG4 is ideal for use in systems employing data communication synchronizing, such as bridge and router networks, HDTVs, automobiles, and more. Its combination of PLLs and reference circuits makes it extremely versatile and reliable, while its small package size and low power requirement make it an attractive choice for a variety of applications.

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