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Phase-Locked Source Clocks at 2.5 GHz

Sept. 11, 2015
A synthesized source includes a frequency reference for generation of low-noise, sine wave outputs at 2.5 GHz.
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Model CRFS75-2500 is an SMT-packaged, PLL clock source with low-noise, fixed-sine-wave output of 2.5 GHz.

Stable sources are vital for maintaining time and frequency in most networks and radios, and the model CRFS75-2500 phase-locked clock source from Crystek Microwave shows its stability at 2.5 GHz in terms of extremely low phase noise. The compact module measures just 0.75 × 0.75 in. in a surface-mount-technology (SMT) package but includes a phase-locked-loop (PLL) frequency source with internal reference. Leveraging proven surface-acoustic-wave (SAW) resonator technology, the low-noise source achieves phase noise of -105 dBc/Hz offset 10 kHz from the carrier, and -130 dBc/Hz offset 100 kHz from the carrier, with a noise floor of -167 dBc/Hz at 2.5 GHz. The root-mean-square (RMS) phase jitter is typically only 70 fs.

The compact source module produces fixed-frequency sine wave output signals at minimum output power of +5 dBm operating on a +5-V dc supply voltage, with typical current draw of 110 mA. Frequency stability is rated as ±25 ppm for an operating temperature range of –20 to +70°C. Second harmonics are typically -20 dBc.

The miniature phase-locked clock source is screened to the applicable requirements of MIL-STD-883 for mechanical shock and vibration, thermal shock, and moisture resistance for use in the most demanding applications. It is usable in a wide range of applications, including in commercial and military communications systems, electronic-warfare (EW) systems, radar, and test-and-measurement equipment.   

Crystek Corp., 12730 Commonwealth Dr., Fort Myers, FL 33913; (800) 237-3061, (239) 561-3311.

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