LMX2531LQ1910E/NOPB Integrated Circuits (ICs)

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The LMX2531LQ1910E/NOPB is a Clock/Timing device specifically developed as a clock generator, phase-locked loop (PLL), or frequency synthesizer. It enables users to have fine frequency control, allowing them to generate very accurate clock frequency outputs. As a programmable clock synthesizer, frequency hops, jitter attenuation, and spread spectrum are possible for spreading frequency hopping applications.

Application Field

The LMX2531LQ1910E/NOPB has applications in mobile, computing, consumer, and industrial markets. It can be used in cellular base stations or mobile hotspots in networks such as Long Term Evolution (LTE), Global System For Mobile Communications (GSM), WiFi, and WiMAX. It can also be used in PC motherboards, as well as tablets and netbooks. It is well-suited for industrial communication systems such as Ethernet, proprietary bus systems, and multimedia I/O.

Working Principle

The LMX2531LQ1910E/NOPB operates on a Few Active Components (FAC) concept in order to supply the proper clock signal and ensure each output is in proper frequency. The device consists of five signal sources, which are divided into four frequency stages with reference, fractional-N, VCO and output stages. The device can generate frequencies up to 2.5GHz. This is achieved by allowing users to have frequency control up to 6.4GHz.

The reference stage\'s signal is generated from a stable 32KHz crystal oscillator, which is then connected to a bank of selectable low-pass filters and charge pumps. The output of this stage is fed to the fractional-N stage for further frequency division. This is accomplished by the use of a combination of modulator, D/A converter and Numerically Controlled Oscillator (NCO) structures. The output of this stage is fed to the VCO stage.

The VCO stage consists of an amplifier, voltage-controlled oscillator, loop filter and divider. The signal from the fractional-N stage is used to modulate the VCO frequency. This modulated signal is then passed through the loop filter. The filtered signal is then used as the reference frequency for the divider. The output of the divider stage is the clock signal.

The output stage is used to generate the output clock signals from the divider stage. The output stage consists of a series of dividers and programmable logic. This stage is used to control the output clock frequencies. In addition, the output stage can also be used for jitter attenuation and spread spectrum adjustments.

In summary, the LMX2531LQ1910E/NOPB is a multifunctional Clock/Timing device designed for mobile, computing, consumer, and industrial applications. The device is capable of generating frequencies up to 2.5GHz and is suitable for spread spectrum frequency hopping applications. The device operates on a Few Active Components concept and includes a reference, fractional-N, VCO and output stages. With its advanced frequency control, users can generate very accurate clock signals and attenuated jitter.

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