5T9955BFGI

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5T9955BFGI is a highly programmable general-purpose frequency synthesizer with low-noise, integer-N and fractional-N, phase-locked loop (PLL) technology for ultra-low jitter applications. The device integrates all of the critical components and circuitry required for a wide range of frequency synthesizer applications including low-jitter clock generation, frequency conversion, frequency synthesis, signal modulation, signal acquisition, signal distribution, and timing control.

Application Field

The 5T9955BFGI can be used in many applications, such as:

• Wireless communications: base station transceivers, PA drivers, and synthesizers.
• Avionics and cellular communications: RF receivers, RF signal sources, and synthesizers.
• Display systems: flat-panel displays, video projector drivers, graphics processors.
• Storage systems: disk drive controllers, disk array controllers, CD/DVD drives.
• Computer systems: server, workstation, personal computers, and embedded controllers.
• Industrial systems: industrial control, measurement, and test equipment.

Working Principle

The 5T9955BFGI works by relying on a fractional-N PLL technology, which includes a voltage-controlled oscillator (VCO) for frequency synthesis. The VCO is the heart of the device and is used to generate the clock signals for device operation. To ensure low jitter, the VCO is tuned to the exact center frequency of the application. In fractional-N PLL architectures, the output frequency is divided by a fractional divider in order to provide a much finer level of frequency tuning than traditional integer-N PLL architectures.

In order to keep the VCO tuned correctly and accurately, the 5T9955BFGI utilizes a phase detector to compare the input clock frequency to the divided VCO frequency. The phase detector then generates a voltage which is used to adjust the VCO frequency so that the input frequency equals the output frequency. Through this feedback mechanism, the device is able to track the input frequency and maintain a specified frequency ratio.

In addition to the basic PLL architecture, the 5T9955BFGI incorporates several design innovations to improve system performance. These include an advanced digital delay-locked loop (DDLL) system, an auto-bandwidth control (ABC) system, and an integrated charge-pump-based voltage control loop. Together, these features help to provide the device with an ultra-low jitter performance, as well as consistent frequency and phase across a wide frequency range and process variations.

In addition to the core PLL design, the 5T9955BFGI also offers programmable fractional divide ratios, frequency multiplication ratios, reference clock options, and optional programmable skew between the input and output clocks. These features can be used to optimize the device for different applications and to ensure maximum performance.

The 5T9955BFGI is ideal for applications that require ultra-low jitter performance in a wide frequency range and process variations. The device offers a reliable and cost-effective solution for clock generation and frequency synthesis, as well as other precision timing applications.

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