IDT2305A-1DCI8

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The IDT2305A-1DCI8 is a Clock Generator, Phase-Locked Loop (PLL), and Frequency Synthesizer IC manufactured by Integrated Device Technology (IDT). This device is a highly-integrated, low power solution for a wide variety of communication applications, including cellular towers, network switches, routers, and base stations. This device technology can be used to provide a wide range of clocking needs, ranging from a low frequency phase-locked loop to an ultra-low jitter clock generator. This article will discuss the application fields and working principles of the IDT2305A-1DCI8.

Application Fields

The IDT2305A-1DCI8 is well suited for communication systems such as cellular towers, network switches, network routers, and base stations. This device is specifically designed for synchronization applications where low-jitter clock frequencies are needed. It is capable of generating refined clock outputs from very low frequency input references and has many features that make it appealing for such applications. The device also features a wide Operating Range of -40°C to +85°C and is available in 8-pin or 16-pin packages to allow design optimization according to space requirements.

The device has both conventional low speed (LSPLL) functionality and advanced high speed (HSPLL) modes to support a wide range of input references and applications, allowing designers to precisely select the appropriate PLL operating mode for their applications. For example, when used in high speed mode, the PLL supports input reference frequencies up to 250MHz, while in low speed mode, the device can support reference frequencies of up to 1kHz. With its wide range of input references and operating modes, the IDT2305A-1DCI8 is the perfect solution for a variety of frequency synthesis and synchronization applications.

Working Principle

The IDT2305A-1DCI8 uses a digital phase-locked loop architecture to generate a precise clock output frequency from an input reference. It features a digital loop filter and an integrated loop controller.

The workings of a digital PLL involve the comparison of two signals, the reference clock and the feedback clock. The reference clock is supplied to the device, while the feedback clock is generated by the PLL itself. The device compares the two signals and adjusts the output frequency of the PLL in order to bring them into phase alignment. This synchronization process is repeated continuously, allowing the PLL to lock the output frequency to the reference frequency.

A single-chip solution, the IDT2305A-1DCI8 is capable of generating very low jitter clock outputs. It has an adjustable control voltage range of 0 to 2.5V, allowing designers to precisely calibrate the loop bandwidth for their application. The device also features an integrated loop filter and internal feedback resistors, providing a wide range of bandwidth and damping options.

The IDT2305A-1DCI8 employs two main features, a voltage-controlled oscillator (VCO) and a frequency synthesizer. The VCO can generate any output frequency within a determined operating range, while the frequency synthesizer provides a fractional- N output frequency, allowing for high resolution clock generation.

In conclusion, the IDT2305A-1DCI8 is a versatile Clock Generator, Phase-Locked Loop (PLL), and Frequency Synthesizer IC manufactured by Integrated Device Technology (IDT). It is an ideal device for synchronization applications where low-jitter clock frequencies are needed, ranging from a low frequency phase-locked loop to an ultra-low jitter clock generator. Its integrated VCO and frequency synthesizer, as well as its adjustable control voltage range make it the perfect device for a wide variety of frequency synthesis and synchronization applications.

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