Phase-Locked Source Clocks at 2.5 GHz CRFS75-2500

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. http://www.crystek.com/microwave/spec-sheets/source/CRFS75-2500.pdf

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