PL123E-05HSC

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PL123E-05HSC Clock Generator, PLL, Frequency Synthesizer

The PL123E-05HSC is a versatile clock generator, phase-locked loop (PLL) and frequency synthesizer with integrated voltage-controlled oscillator (VCO). The device allows for the generation of multiple clock frequencies from a single low-frequency reference clock. It features a locked-loop crystal oscillator for superior phase noise performance, a built-in phase/frequency detector, ultra-low phase-error phase interpolation, and flexible programmable functions to meet high-end clock system requirements.

The PL123E-05HSC provides typically excellent through-from frequency synthesizing, eliminating the need for a separate oscillator to generate a frequency. The high-performance VCO offers a wide tuning range with a low phase-noise floor and low in-band spurious content. Furthermore, the device provides a wide variety of frequency sources and programmable locking mechanisms such as single-input multiple-reference (SIMR), open/close looped, reversed, dual-output/dual-input, etc. to provide further flexibility.

Key Features and Benefits

• High performance, small size, and low power consumption
• Accurate frequency generated from a single low-frequency reference clock
• Single-ended/differential input/output
• Integrated voltage-controlled crystal oscillator (VCXO)
• Integrated phase/frequency detector
• Fractional-N PLL for superior synthesizing
• Ultra-low phase-error, low jitter and low consumed power
• High-frequency tolerance and lock range
• Wide bandwidth and low power consumption
• Lower total PLL loop error

Applications

The PL123E-05HSC is highly suitable for many applications such as:

• Wireless base stations
• Communication systems
• Network processors
• Test and measurement equipment
• Clocking for embedded processors, DSPs and ASICs, etc.
• Optical transport networks

Working Principle

The PL123E-05HSC uses a phase-locked loop (PLL) to generate high frequency clocks from a single low-frequency reference clock. The device contains two sections, the phase-frequency detector (PFD) and the voltage-controlled oscillator (VCO). The PFD provides a means of comparing the incoming clock’s phase with the reference clock’s phase. The PFD then adjusts the VCO’s frequency so that the output clock will follow the reference’s phase. The PL123E-05HSC also utilizes a fractional-N frequency synthesizer to achieve a higher frequency than would be possible with an integer-N method.

With fractional-N frequency synthesizing, the output frequency can be divided into multiple closely spaced frequencies, allowing the output to be locked to a reference clock with better accuracy. This helps to reduce jitter in the output and provides better stability when the output has a high frequency. Additionally, the PL123E-05HSC can be used to generate multiple clocks with frequencies that are not harmonic with each other, which is especially useful in multi-carrier applications.

In order to ensure the accuracy of the generated output clock, the PL123E-05HSC has an integrated phase/frequency detector (PFD). The PFD monitors the phase difference between the reference clock and the clock generated by the VCO. When the phase difference becomes too large, the PFD will adjust the VCO’s frequency so that the output will follow the reference numerically.

The PL123E-05HSC can be easily programmed to achieve a variety of performance specifications such as jitter, power consumption, and phase noise. The device has a wide range of programmable features, allowing it to be used for a variety of applications.

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