IDT2308B-1HPGI

IDT2308B-1HPGI is a clock generator product of Integrated Device Technology (IDT). It is used to provide precision clock signals to a variety of circuit applications and is categorized under Clock/Timing - Clock Generators, PLLs, and Frequency Synthesizers.

The IDT2308B-1HPGI can generate LF and HF precision clock signals accurately and reliably. The device supports a wide range of frequencies from 0.5 kHz to 250 MHz range. This clock generator offers both a low jitter 0.5 ppm or a low skew 1 ppm clock signal. It also provides a wide variety of output formats including LVCMOS, LVPECL and CML as well as a DVREF output. The device also features spread spectrum operation and is compliant to PCIe Gen2 and PCIe Gen3.

The working principle of IDT2308B-1HPGI is based on a free-running crystal oscillator, where an external crystal is used to generate a clock signal. The oscillator output is then fed to the circuit and a frequency divider is used to create the output clock frequency. The frequency divider uses a combination of PLLs, fractional-N divide-by logic and additional register logic to divide the frequency with precision.

The PLLs in the device are used to modify the accuracy of the output clock signal. A phase-locked loop (PLL) contains three main components including a phase detector, a low-pass filter, and a voltage-controlled oscillator (VCO). The phase detector detects the phase difference between the input signal and the output signal. The output of the phase detector is then filtered using the low-pass filter, which smoothens the output and reduces noise, thus providing good clock accuracy. Finally, the voltage-controlled oscillator (VCO) is used to convert the phase information to frequency information.

The IDT2308B-1HPGI also features an integrated spread spectrum generator. The spread spectrum generator is used to reduce EMI (electromagnetic interference). This is done by modulating the output clock signal with a pseudo-random signal that varies the frequency of the signal. This way, the signal is spread out over a wide range of frequencies and the peak power of the signal is reduced, preventing EMI.

The IDT2308B-1HPGI is a powerful, feature-rich clock generator suitable for a wide range of applications. It offers clock generation with low jitter and skew, low power consumption and spread spectrum support. The device is compliant to PCIe and is available in a range of packages.