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Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Introduction

LMX2485SQX/NOPB is a mixed-signal, low-power system clock generator IC with integrated voltage regulator. It provides a flexible, reliable, cost-effective method of generating a variety of clock signals required for today\'s system architectures. The device is ideal for applications running on Intel and AMD processors that require a wide range of clock frequencies.

Feature and Benefits

The LMX2485SQX/NOPB supports a wide range of output clock frequencies, each capable of frequency synthesis using a single reference frequency. The built-in PLLs provide fast lock times and minimal phase noise, allowing for quick, reliable system clock signal generation. The device also features an integrated voltage regulator, allowing for stable voltage supply to clock generator and other componentry.

In addition, the LMX2485SQX/NOPB also offers differential outputs and has the option of multiple input reference frequencies. This makes it suitable for use in systems which require differential clock signals and multiple input reference frequencies. The integrated voltage regulator provides additional design flexibility by allowing the user to set optimal voltage supply to the clock generator.

Application Field

The LMX2485SQX/NOPB is ideal for a wide range of applications including PC and server motherboards, notebook and laptop systems, embedded systems, and intelligent systems. The device can be used to generate a wide range of clock signals including syste¬m processor clocks, CPU bus clocks, memory clock, I/O clocks, system reset clocks, clock generators, and other similar requirements.

Working Principle

The core of the LMX2485SQX/NOPB is a digital phase locked loop (DPLL) circuit that uses a single reference frequency to produce multiple clock outputs. The integrated voltage regulator allows for adjustable output voltage supply to clock generator and other components connected to the device. This enables the device to operate at lower jitter and provide more reliable clock signals.

The DPLL synthesizes a clock signal by multiplying or dividing the reference frequency. The input reference frequency is multiplied or divided by a controlled fractional-N divider to obtain the desired output clock frequency. The controlled fractional-N divider uses a programmable DSP-based controller to produce a dynamically adjustable divider ratio. This allows for the wide range of output clock frequencies that the LMX2485SQX/NOPB is capable of producing.

The device also offers differential outputs, allowing for the possibility of two clock outputs from the same reference frequency. The device also has support for multiple input reference frequencies and differential inputs. This allows for the generation of output clock signals based on multiple input reference frequencies, al¬lowing for additional design flexibility.

Conclusion

The LMX2485SQX/NOPB is a highly integrated, low-power system clock generator IC with integrated voltage regulator. The device offers an array of features and benefits that make it an ideal choice for a wide range of applications. It offers a flexible, reliable, and cost-effective method of generating clock signals with wide range of frequencies and low jitter, making it perfect for Intel and AMD processor based systems.

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