IDT2308B-1DC

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IDT2308B-1DC is a type of clock generator, frequency synthesizer and phase lock loop (PLL) device. It generates stable, low jitter clock signals with a frequency range of 6 to 800 MHz. The device offers a choice of fractional or integer multiples of a reference frequency, which simplifies frequency translation and distribution. Additionally, the integrated PLL provides improved system performance and enhances system flexibility.

The IDT2308B-1DC is designed to optimize the performance of systems in a wide range of applications, from datacom to embedded systems, storage, and data acquisition. By leveraging a wide range of PLL, voltage controlled oscillator (VCO) and clock multiplier technology, IDT2308B-1DC supports a wide range of high performance applications.

Working Principle

The IDT2308B-1DC utilizes a PLL to provide a highly-stable clock signal with a frequency range from 6 to 800 MHz. The device accepts a low jitter reference clock input, typically from a crystal oscillator, and generates a synthesized output clock with a frequency that is either an integer or a fractional multiple of the reference clock. The synthesized output clock typically has lower jitter than the reference clock, due to the PLL\'s ability to filter out reference clock jitter. This enables systems to achieve better performance than with the same reference clock without PLL.

VCO Tuning

The VCO tuning range of IDT2308B-1DC is 6-800Mhz. The device\'s VCO tuning depends on several factors such as reference frequency, maximum VCO frequency range, and phase detector characteristics. The maximum VCO frequency is determined by a combination of the selected reference frequency and the on-chip VCO tuning capacitors. The phase detector characteristic determines the amount of pullability that the PLL can achieve from its reference clock. Pullability is the ability of the PLL to move the synthesized output frequency away from the reference frequency if the output signal is not in phase with the reference signal. If the output signal is not in phase with the reference signal, the PLL can move the output signal frequency slightly higher or lower until the two signals are in phase.

Frequency Synthesizing

The IDT2308B-1DC is capable of synthesizing frequencies ranging from 6 to 800 MHz. The device uses fractional-N frequency synthesis, which allows the user to set the output frequency at any multiple of the reference clock frequency. The frequency synthesizer consists of a digital phase accumulator and a digital loop filter. The digital loop filter helps to control the output frequency by adjusting the amount of charge injected into the loop filter in each cycle. This helps to reduce the jitter caused by low-frequency noise.

PLL Configuration Options

The IDT2308B-1DC offers a variety of PLL configuration options. In addition to the standard off-the-shelf PLL settings, the device supports frequency dividers, loop bandwidth, lock range and VCO auto-calibration. These settings can be tailored to individual applications, allowing for better system performance.

Power Supply

The IDT2308B-1DC is powered by a single +3.3V power supply. The device is designed to minimize power consumption, which helps to ensure reliable operation and reduce system heat dissipation. The device also offers a low standby power consumption mode, which helps to reduce power consumption when the device is not in active use.

Application Fields

The IDT2308B-1DC is ideal for a wide range of applications, including datacom, embedded systems, storage, data acquisition, audio and video equipment, wireless communications, and high-speed data I/O. The device\'s wide range of frequency and PLL settings make it suitable for any low-jitter clock or frequency synthesizing application. Additionally, the device\'s low power consumption helps systems to achieve robust operation while keeping power consumption to a minimum.

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