LMX2531LQ1312E/NOPB

The LMX2531LQ1312E/NOPB is an ultra-low noise, any-frequency integer-N Phase Locked Loop (PLL) designed for clock and frequency synthesizing applications. This PLL integrates a high performance voltage control oscillator (VCO), providing users with an unprecedented combination of both frequency and phase noise levels.

The LMX2531LQ1312E/NOPB is based on a novel body bias technique for reducing core voltage changes and power supply noise. This PLL is designed to meet the highest performance needs of enhanced timing requirements in the computer, communications, instrumentation, and consumer product markets.

Application Field

The main applications of the LMX2531LQ1312E/NOPB include:

• Communication systems
• Computer systems
• Instrumentation systems
• Consumer product systems

Working Principle

The LMX2531LQ1312E/NOPB consists of a VCO and a phase frequency detector, which form the core of the PLL circuit. The VCO is a high-performance voltage control oscillator and provides the output signal of the PLL. The phase frequency detector tracks the input clock reference and the feedback from the VCO, allowing the PLL to scan a wide range of frequencies. When the two signals are in phase, the frequency is locked and the PLL is in its steady-state frequency locked mode.

The output of the VCO is sent to a charge pump and a loop filter, which compensate and control the phase-locked loop gain. The loop filter also consists of a low pass filter and an amplifier. The amplifier amplifies the filtered signal and sends it to the phase frequency detector, which in turn sends it back to adjust the VCO frequency. This cycle of feedback and adjustment is repeated until the VCO reaches its desired frequency, which is then output as the new clock reference.

The LMX2531LQ1312E/NOPB is optimized for low harmonic output within the specified range and compliant with the requirements of the Jitter Performance requirement, designed for use in a wide range of communication, computer and consumer product systems. This PLL helps achieve a wide variety of performance needs, including high-frequency, low-noise, and low-jitter operation.

In addition, the LMX2531LQ1312E/NOPB is designed for flexibility in controlling output frequency and achieving optimum performance in the corresponding application. This PLL offers a variety of integrated tools to help users to customize the design and to achieve the best performance possible.