SiTime has introduced the Endura temperature-compensated oscillator (Super-TCXO) ENDR-TTT for position, navigation, and timing (PNT) systems that depend on GNSS. The device is intended to maintain a stable reference when GNSS signals are unavailable or degraded due to interference, jamming, environmental conditions, or antenna shading, helping receivers preserve timing accuracy and recover faster once signals return.
In GNSS-denied conditions, holdover performance determines how long a receiver can sustain timing and frequency stability without external synchronization. SiTime states the ENDR-TTT delivers up to 20× longer holdover and up to 20× better PNT accuracy compared to conventional approaches, supporting tighter resynchronization windows and improved robustness against spoofing attempts that rely on forcing wider acquisition and tracking searches.
The oscillator is specified for ±50 ppb frequency stability over temperature and is rated for operation from –55 °C to +125 °C. It is also designed for high mechanical resilience, with 30,000 g operational shock tolerance and a typical g-sensitivity of 0.004 ppb/g to reduce frequency disturbance under vibration and acceleration. Long-term stability is supported by ±0.5 ppm aging over 20 years, reducing the need for field recalibration over extended service intervals.
For system-level frequency control, optional digital pulling is available via I²C or SPI, enabling fine trim and calibration workflows without changing the reference device. The ENDR-TTT is targeted at aerospace, defense, and industrial GNSS receivers requiring low power, compact integration, and timing stability under harsh conditions.
The ENDR-TTT is available for sampling now, with mass production expected in Q1 2026.
Filed Under: Active Components, Military, Oscillators, Tools
