Two Endura models extend Endura family for aerospace and defence

Two Endura precision timing oscillator families released by SiTime are ruggedised devices engineered for operation in extreme conditions in aerospace-defence applications such as positioning, navigation and timing (PNT), tactical communications, network synchronisation and surveillance. The additions to the SiTime portfolio are the Endura SiT5541 Super-TCXO and the Endura SiT9551 / SiT9356 / SiT9357  low-jitter differential oscillators. 

“Timing technology is ever more crucial in aerospace and defense applications where extreme conditions are the norm,” said Fari Assaderaghi, executive vice president, technology and engineering, SiTime. “Today . . . timing is a major source of performance challenges during system verification, qualification, and field operation. . . With the drive to higher performance and positioning accuracy, timing requirements for new aerospace-defence electronics are only getting more stringent. It is difficult to foresee how legacy timing devices will continue to perform well in these new systems,” he said

SiTime said its MEMS, analogue and systems technologies enable many features that simplify design. For example, frequencies are programmable up to six decimal places of accuracy and ensure that the designer can select the exact frequency they want, to enhance system performance. With a frequency stability specification as low as ±10 ppb, designers can replace unreliable, power-hungry, large OCXOs with easy-to-use Super-TCXOs, advised the company. They are also resistant to power supply noise, which is a common problem in the dense electrical environments of aerospace-defence electronics.

The Endura SiT5541 Super-TCXOs operate at 1.0 to 60MHz in an operating temperature range of -40 to +105 degrees C. In addition to ±10 ppb frequency stability over the full temperature range, they can be used to replace more expensive, power-hungry, and less-reliable OCXOs. They are also characterised by what is claimed to be an industry-leading 0.01 ppb/g g-sensitivity per MIL-PRF-55310 and power consumption of 110mW (typical) which is two to 10 times lower than ±10 ppb OCXOs, said SiTime.

The Endura SiT5541 Super-TCXOs also exhibit ±0.5 ppb/°C dF/dT (frequency slope) and are resistant to thermal shock and airflow. They also feature ±300 ppb 20-year aging at 85 degrees C and eliminate expensive in-factory calibration that is required with less stable devices.

Supplied in a small 7.0 x 5.0mm ceramic package, the Super-TCXOs are insensitive to board bending stress which reduces board layout constraints.

The Endura SiT9551 / SiT9356 / SiT9357 low-jitter differential oscillators enable low data error rates and uninterrupted communications for on-the-ground, mounted, dismounted and airborne conditions.

The SiT9551 operates across 15 frequencies from 25 to 644.5 MHz, 70 fs RMS typical IPJ (integrated phase jitter, 12 kHz to 20 MHz integration range).

The SiT9346 has a frequency range of 1.0 to 220MHz frequency range, 150 fs RMS typical IPJ.

The SiT9347 has a frequency range of 220 to 920MHz frequency range, 150 fs RMS typical IPJ.

Power supply noise rejection (PSNR) of 9 fs/mV ensures peak performance in the presence of power-supply noise, which is a common issue in dense aerospace-defence electronics, said SiTime. 

The low-jitter oscillators have an operating temperature range of -55 to +125 degrees C, 0.04 ppb/g g-sensitivity per MIL-PRF-55310, ±20 to ±50 ppm frequency stability over the full temperature range and 26mA no load current (typical) with LVDS, 1.8V, 2.5V or 3.3V supply voltage.

The oscillators are available in 2016, 2520 and 3225 QFN packages.

All device families are sampling now. Volume production for Endura SiT5541 Super-TCXO is expected in March 2023, and July 2023 for the Endura SiT9551 low-jitter differential oscillators.

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