LMX2336USLBX

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The LMX2336USLBX is an integrated Clock Generator component created by Texas Instruments meant for use in digital applications that require ultra-low jitter performance. This component is part of the Space Conserving Clock generation family, being a combination of a frequency synthesizer, a phase-locked loop (PLL), a voltage-controlled oscillator (VCXO) and a crystal oscillator in a very small space. This small-form factor allows for easy integration in projects, making it a very popular choice for a multitude of applications.

Essentially, the LMX2336USLBX is a 4-in-1 multi-component clock generator. It combines a frequency synthesizer, a PLL, a VCXO, and a crystal oscillator into a single, space-efficient package. This combination is what makes the LMX2336USLBX such a popular choice for applications, as it provides high-quality, low-jitter clock signals in a small volume, at a much lower cost than a system made up of separate components.

Applications

The LMX2336USLBX is mainly used for communication and data transfer applications, such as Ethernet, GSM, WCDMA, CDMA2000, and DOCSIS. It is also used in data server applications due to its ability to generate outputs from 20 MHz to 1.2 GHz with a very low jitter signal. Furthermore, the built-in watchdog timer allows for automatic recovery from signal interference or system lock-up occurrence, making it a great choice for applications requiring reliable performance.

Working Principle

The LMX2336USLBX is a combination of a frequency synthesizer, a PLL, a VCXO, and a crystal oscillator. The basic principle of operation is that the integrated crystal oscillator generates a signal whose frequency is divided down by the frequency synthesizer to create a system clock signal. The system clock drives the phase-locked loop which manages the operation of the voltage-controlled oscillator. This oscillator is then outputted at a frequency determined by the reference clock, providing improved performance and low jitter.

The frequency synthesizer allows for the clock signal to be divided down from the oscillator frequency to a level suitable for the system. In addition, it can be used to generate multiple frequency outputs from a single reference oscillator allowing for increased flexibility and performance. The PLL is responsible for taking the reference clock and using it to generate an output signal with an identical phase and frequency but with lower jitter levels.

Finally, the VCXO is used to fine-tune the generated signal. It takes the output of the PLL and adjusts the phase and frequency to ensure the best possible low-jitter performance is achieved and outputted.

Conclusion

The LMX2336USLBX is an integrated Clock Generator from Texas Instruments, combining a frequency synthesizer, a PLL, a VCXO, and a crystal oscillator into a single, space-efficient package. It is mainly used for communication and data transfer applications and is capable of generating outputs from 20 MHz to 1.2 GHz with a very low jitter signal. The combination of these components allows for much better performance to be achieved at a much lower cost than if each component was purchased separately.

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