IDT5V991A-5JGI

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Clock/Timing – Clock Generators, PLLs, Frequency Synthesizers

The IDT5V991A-5JGI is a high performance frequency synthesizer from Integrated Device Technology (IDT) that offers a wide range of features in a small package at a low cost. This versatile device is ideal for applications like Ethernet, IP-networks, wireless local area networks, symmetric digital subscriber line (SDSL) applications, and more. It offers flexible output frequency configurations, with options for single-ended, differential, or switched clock outputs. It has integrated charge-pump circuitry to support both standard and low-level output configurations.

The IDT5V991A-5JGI integrates programmable digital PLL, voltage controlled oscillator (VCO), variable-gain amplifier (VGA), and programmable dividers. This eliminates the need for external clock sub-dividers and allows for very tight frequency accuracy and low power consumption. It also offers users a choice of frequencies from hundreds of kilohertz up to several hundred megahertz. Its flexible output configurations make it suitable for use in a wide variety of applications, from high-frequency digital communications to low-speed data transmission.

The IDT5V991A-5JGI device is based on a fully integrated frequency synthesizer core. This core supports a multitude of frequency configuration options, including single-ended, differential, and switched outputs. This device is capable of generating frequencies up to several hundred megahertz with minimum jitter and very low power consumption. Its highly integrated design also makes it an excellent choice for applications where small size and low power consumption are required.

Application Field

The flexible output configurations make the IDT5V991A-5JGI an ideal choice for a variety of clock and timing applications in communications, data processing, audio/video, medical, automotive, industrial and consumer electronics. In communications systems, the ability to support multiple frequency outputs makes it ideal for High-speed Ethernet, IP networks, wireless local area networks, fiber-optic networks, wireless telemetry and satellite communications. For data processing and server applications, the device is capable of generating multiple frequencies to support multiple system busses in server and storage systems. It also provides a timing source for medium and high-speed data transfers in microprocessor and video systems, as well as precision clock synchronization in video displays. In automotive systems, the device can provide accurate timing to support vehicle navigation systems, engine management systems, infotainment systems and tire pressure monitoring systems.

Working Principle

The working principle of the IDT5V991A-5JGI is based on a combination of a digital phase-locked loop and voltage-controlled oscillator. The programmable PLL phase detector compares the phase difference between the reference clock and the device\'s output frequency, which is then used to adjust the internal VCO frequency. The VCO\'s frequency is also adjustable using a voltage control signal, allowing users to select an exact frequency using an external resistor-capacitor (RC) network. The output frequency is then generated using programmable divider chains, which divide the VCO frequency down to the same frequency as the reference clock.

The device also supports frequency programming and slew control, allowing users to dynamically adjust the frequency of the output clocks. This allows for tight control of output jitter and run-time clock drift. This feature is ideal for applications where accuracy and stability of the output clocks needs to be maintained in the long term.

The IDT5V991A-5JGI is a highly integrated, low-cost, low-power frequency synthesizer that is suitable for use in a wide variety of clock and timing applications. Its integrated PLL and VCO eliminate the need for external clock sub-dividers, while its output flexibility and tight frequency accuracy make it perfect for communications, data processing, and audio/video systems.

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