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Electronic Design

OCXO Passes Muster In Military Vibration And Stability Tests

The Department of Defense is looking for a few good oven-controlled crystal oscillators (OCXOs). It demands improved phase noise to meet the needs of the next generation of radar, navigation, and secure communications systems. Frequency accuracy and stability are essential to the success of the new Communications, Navigation and Identification (CNI) softwaredefined radio platforms.

The 9633 from Symmetricom answers the call (see the figure). It's designed for stringent military applications where stability under severe vibration and shock are essential. At the heart of this acceleratedcompensated OCXO, the unit's oscillator uses an SC-cut quartz resonator running at 10 MHz.

The output is a sine wave at 7.0 ±2 dBm with a 50-Ω impedance. The harmonic output is down to ?35 dBc, and nonharmonic energy is down to ?80 dBc. The 9633's typical frequency stability is 5 × 10-12 with aging per day of 3 × 10-10. The acceleration sensitivity per g (gamma) is less than 2 × 10-11. The operating temperature ranges from ?40°C to 55°C. The output frequency is tunable by ±1 × 10-8 via an external I2C port. Its dc power requirement is 3 W at 15 V.

Contact the company for pricing. Symmetricon Inc.

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