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Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

The LMX2332LSLBX/NOPB is a frequency synthesizer, also known as a programmable clock generator, for use in cell phones, GPS systems, rapid transaction systems, high-speed communications and other network-sensitive applications. It is a multi-function, low power, high performance, programmable clock synthesizer that supports a wide range of crystal and differential reference frequencies. The device displays high jitter performance, low power consumption and good long-term stability.

Features

• Supports up to five programmable output frequencies
• Supports a range of differential and single-ended crystal and voltage-controlled oscillator (VCXO) reference frequencies
• Programmable phase-locked loop (PLL) divider values
• Programmable PLL operating parameters
• High jitter performance
• Low power consumption
• Loser tolerance of the output frequency to voltage supply change
• Good long-term stability

Applications

The LMX2332LSLBX/NOPB is suitable for a range of applications. It is particularly useful in cell phones, GPS systems, rapid transaction systems, high-speed communications and other network-sensitive applications. It can also be used for clock noise reduction, reduced cycle time and improved channel to channel performance.

Working Principle

The device utilizes an integrated, programmable phase-locked loop (PLL) with a low jitter output to generate clock signals at five frequencies. The PLL is configured using programmable divider values and PLL operating parameters stored in an on-chip φ (phi) ROM. The PLL can generate fixed frequency outputs at up to five separate frequencies and supports an input reference frequency ranging from 1MHz to 66MHz. Output frequencies are synthesized by applying a μ (mu) correction factor to the fixed output frequency. The μ parameter is programmed at the start of the circuit operation and remains constant thereafter. The PLL also incorporates a charge pump for improved pull-in performance.

Conclusion

The LMX2332LSLBX/NOPB is a multi-function, low power, high performance, programmable clock synthesizer that supports a wide range of crystal and differential reference frequencies. It can be used for clock noise reduction, reduced cycle time and improved channel to channel performance in cell phones, GPS systems, rapid transaction systems and other high-speed communication networks. The LMX2332LSLBX/NOPB ensures high jitter performance and good long-term stability.

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