Precision timing oscillators deliver high stability

Aerospace and defense require precise and stable timing even in extreme temperatures. Designed to address these extreme conditions, SiTime announced two families of high-performance Endura precision timing oscillators. Both families deliver 10× better environmental resilience, while the Endura Super-TCXO family delivers up to 5× improved stability and the differential oscillators claim the best jitter. Target applications include positioning, navigation and timing (PNT), tactical communications, network synchronization and surveillance.

Timing represents major performance challenges during system verification, qualification, and field operation, often requiring troubleshooting and/or negotiating waivers with end customers, said SiTime, and new aerospace-defense electronics requirements are rapidly becoming more stringent, making it challenging for legacy devices to operate in these systems.

(Source: SiTime)

Key features of the Endura SiT5541 ultra-stable Super-TCXO include a frequency range of 1 to 60 MHz, a -40°C to 105°C operating temperature range, ±10 ppb frequency stability over the full temperature range, 0.01 ppb/g g-sensitivity per MIL-PRF-55310, 110 mW (typ.) power consumption and ±300 ppb 20-year aging at 85°C, eliminating  in-factory calibration. Housed in a small 7.0 × 5.0 mm ceramic package, the device is insensitive to board bending stress.

The Endura SiT9551, SiT9356 and SiT9357 ultra-low-jitter differential oscillators enable low data error rates and uninterrupted communications for on-the-ground, mounted, dismounted and airborne conditions. The SiT9551 features 15 different frequencies from 25 to 644.5 MHz and 70 fs RMS typical IPJ (integrated phase jitter, 12 kHz to 20 MHz integration range). The SiT9356 offers a 1-to-220-MHz frequency range and 150 fs RMS typical IPJ and the SiT9357 provides a 220-to-920-MHz frequency range and 150 fs RMS typical IPJ.

All three oscillators feature 9 fs/mV power supply noise rejection (PSNR), -55°C to 125°C operating temperature range, 0.04 ppb/g g-sensitivity per MIL-PRF-55310 and ±20 to ±50 ppm frequency stability over the full temperature range. They are available in 2016, 2520 and 3225 QFN packages.

Both families are currently sampling.  Volume production for the Endura SiT5541 ultra-stable Super-TCXO and Endura SiT9551 low-jitter differential oscillator is expected in March 2023 and July 2023, respectively. Upon release, all Endura timing solutions will be available on SiTimeDirect for fast configuration and 48-hour shipments.