LMK00338RTAT Integrated Circuits (ICs)

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The LMK00338RTAT is an ultra-low jitter external timing generator (ETG) designed to simplify timing and avoidance of traditional phase-lock loops (PLLs) in radio frequency (RF) communications and clock/timing systems. It contains a fractional-N frequency synthesizer based on a digitally-controlled oscillator (DCO) to produce frequencies from their DC and low-frequency outputs. Additionally, the LMK00338RTAT contains a digitally calibrated frequency synthesizer based on a temperature compensation reference oscillator and temperature compensated bias voltage for stability over temperature. It also includes level shift, divide-by-2, and divide-by-4 outputs as well as an auxiliary controller for frequency/phase modulation control and synchronous initialization function.

The LMK00338RTAT is an ideal solution for applications requiring ultra-low jitter clocks up to 3.3 Gb/s, and has many applications in radio frequency (RF) communications, clock/timing systems, and mixed-signal ICs. It is designed to provide consistent jitter performance across a wide frequency range, allowing it to be used in a variety of applications.

The LMK00338RTAT can be used as a frequency source in applications requiring multiple clocks. It has built-in synth apps, such as divide-by-2, divide-by-4, level shift, and total phase offset control. Additionally, the external timing generator supports a synchronous initialization function, which can be used to simplify synchronization of multiple clock sources. This allows for easier signal distribution and improved noise performance

The working principle of the LMK00338RTAT is based on fractional-N frequency synthesis, a type of frequency synthesis in which the total frequency is generated using a combination of two discrete frequencies. The frequency synthesizer uses a crystal oscillator as a reference frequency and a digitally controlled oscillator (DCO) as a secondary frequency. The range of possible frequencies is determined by a combination of ratios between the two frequencies and the divide-by-2 and divide-by-4 outputs. The total output frequency is programmable in 1 kHz steps and the integral non-linearity (INL) is better than <2 ppm.

The LMK00338RTAT is designed to simplify the implementation of clock and timing systems with improved jitter and noise performance. The fractional-N frequency synthesis allows for relatively low jitter output with no phase-lock loops (PLLs) or external components. Additionally, it has built-in features such as divide-by-2, divide-by-4, level shift and total phase offset control that provide additional flexibility and ease-of-use. Finally, a synchronous initialization function allows for easier signal distribution and improved noise performance.

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