IDT5V991A-2JG8

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It is no surprise that IDT5V991A-2JG8 is a versatile clock generator. It is mainly used in automotive and industrial applications, and is designed to offer a variety of frequency and phase control options. This allows reliable signal performance with superior signal integrity.

The IDT5V991A-2JG8 can operate up to 150MHz and is capable of providing up to 16 different frequencies in four different channels. The part offers suppliers the flexibility to set up reprogrammable frequency classes, with preset frequency options, depending on their needs. It also provides users with the ability to control their PLLs (Phase Locked Loop) and synthesizers (frequency synthesisers) through programmable functions.

At the core of the IDT5V991A-2JG8, is a crystal oscillator. The crystal oscillator is a small device composed of a crystal of quartz surrounded by an electronic circuit. The quartz crystal is specifically designed to vibrate at a precise frequency, which is then converted into an electronic signal. This signal is amplified and outputs as a regulated clock signal for downstream electronic systems.

The IDT5V991A-2JG8 integrates both a phase and frequency control unit. The phase control unit is able to control the phase of the clock signal, by delaying its arrival time at the external device. The frequency control unit is able to control the frequency of the clock signal, with a fractional-N synthesis scheme.

The fractional-N synthesis scheme is a frequency-controlled oscillator circuit design. It provides a linear change of the output frequency by varying the resistance or capacitance of an external component. The fractional-N synthesis scheme also provides excellent dithering noise performance, which is extremely important for on-board clock generation applications.

The IDT5V991A-2JG8 consists of two loops, which are connected to its output. One loop is a programmable synthesiser, which is used to control the frequency of the output signal. The other loop is a phase locked loop, or PLL, which is used to control the phase of the output signal.

In order to ensure the required frequency accuracy, the PLL and the programmable synthesiser are provided with a reference clock signal from an external clock oscillator. The external clock oscillator is expected to deliver an accurate frequency signal, to enable correct, consistent clock generation.

The programmable synthesiser provides frequency control, depending on the user’s requirements. It provides a routing hierarchy, with selectable output frequencies, depending on the user’s needs. The programmable synthesiser works in conjunction with the PLL, to create the output clock signal.

The PLL circuitry is used to further refine the output signal. It compares the frequency and phase of the received signal to that of a reference signal, and adjusts its output accordingly. The PLL is also used to control jitter and jitter transfer within the clock generator, and to ensure excellent signal integrity.

Overall, the IDT5V991A-2JG8 is an incredibly versatile clock generator, designed for use in automotive and industrial applications. Its fractional-N synthesis scheme, programmable synthesiser and PLL provide precision control of the output signal, and its crystal oscillator ensures a reliable, stable output, with superior signal integrity.

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