MAX3670EGJ

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The MAX3670EGJ is a versatile clock generator, frequency synthesizer, and phase locked loop (PLL) that is capable of generating some of the cleanest-possible signals at frequencies up to 1.25GHz. It supports both a quartz crystal and an external voltage-controlled crystal oscillator (VCXO) input, enabling a wide range of applications and the support of reference frequencies from 10MHz to 45MHz. As of such, the device is ideal for digital XAUI, Infiniband, Ethernet, and other clocking schemes at up to 10G rates.

Overview of MAX3670EGJ Features

The key features of the MAX3670EGJ include:

• Input frequency range from 10MHz to 45MHz
• Ultra-clean clock output: Phase noise of -158dBc/Hz at 10kHz, -140dBc/Hz at 100kHz, and -130dBc/Hz at 1MHz offset
• Output frequency range (XU) from 25 MHz to 4GHz
• Hibernate mode consumption of 10µA
• Two enable/disable modes
• Programmable output drive strength of 2mA to 6mA
• Internal/external reference on/off selection
• Configurable loop bandwidth

Application Fields of MAX3670EGJ

Given the exceptional switching speed, low power consumption, and adjustable loop bandwidth, the MAX3670EGJ is a leading-edge clock generator and PLL for multiple applications. A few of the most noteworthy applications include:

• High-Definition Video: The device can provide HD video interface solutions for cameras, TVs, DVRs, gaming devices, and medical/imaging devices. By incorporating the MAX3670EGJ, these systems can achieve low-power and low-clocking jitter performance, eliminating the need for complicated external clocking circuits.
• Wireless Communications: The device can be used in Wi-Fi and WWAN applications, providing a low-noise clock output of up to 1.25GHz while consuming minimal power.
• Servers & Storage: As servers and storage systems have become increasingly data-thirsty, the need for reliable, low-noise clock generators and PLLs has increased accordingly. The MAX3670EGJ provides clocking solutions for these types of systems, helping them to keep up with the ever-evolving digital data needs of the world.
• Networking and Automation: The Max3670EGJ is an ideal clock generator and PLL for routers, switches, and automated industrial control systems. It can eliminate the need for complex and expensive external clocking circuits and reduce the overall size of these types of systems.

Working Principle of MAX3670EGJ

At its core, the Max3670EGJ is a PLL frequency synthesizer that utilizes a voltage-controlled oscillator (VCO) to generate the clock output frequencies. This circuit consists of the VCO, divide-by-N Prescaler, and the Loop Filter – working in unison to create the output frequency. The input reference clock frequency is divided down by the Prescaler and is then compared with the frequency of the VCO, in order to develop an error signal. The error signal is then used to adjust the VCO frequency and the loop filter which, in turn, adjusts the feedback of the loop and the output frequency.

The MAX3670EGJ is capable of synthesizing precise signals from any reference frequency from 10MHz to 45MHz and is designed to minimize phase and jitter noise. Overdriving the frequency, however, will result in distortion of the output signal. For example, a reference frequency of 20MHz will produce an output signal of 1GHz, but output signals over 1.25GHz will be distorted. The output frequency cannot be changed once the device is powered up; therefore, it is important to select the proper reference frequency prior to operation.

Conclusion

The MAX3670EGJ is a versatile yet powerful clock generator, frequency synthesizer, and PLL, capable of generating some of the cleanest-possible signals at frequencies up to 1.25GHz. It requires a quartz crystal or an external voltage-controlled crystal oscillator (VCXO) for reference frequencies from 10MHz to 45MHz and is designed for a wide range of applications. Its low power consumption, ultra-clean clock output, and configurable loop bandwidth make it the ideal choice for digital XAUI, Infiniband, Ethernet, and other clocking schemes at up to 10G rates.

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