SiTime has unveiled the Endura temperature-compensated oscillator (Super-TCXO) ENDR-TTT designed for position, navigation, and timing (PNT) systems reliant on GNSS. This device aims to maintain a stable reference during GNSS signal disruptions caused by interference, jamming, environmental factors, or antenna blockages, ensuring receivers maintain timing accuracy and quickly recover once signals are restored.
In situations where GNSS signals are unavailable, the holdover performance of a receiver determines how long it can sustain timing and frequency stability without external synchronization. SiTime claims that the ENDR-TTT offers up to 20× longer holdover and up to 20× better PNT accuracy compared to traditional methods, enabling tighter resynchronization windows and increased resilience against spoofing attempts that require wider acquisition and tracking searches.
The oscillator guarantees ±50 ppb frequency stability across temperatures and operates within a range of -55 °C to +125 °C. It boasts high mechanical durability, withstanding operational shocks of up to 30,000 g and exhibiting a typical g-sensitivity of 0.004 ppb/g to minimize frequency disturbances during vibration and acceleration. Long-term stability is ensured with ±0.5 ppm aging over 20 years, reducing the necessity for field recalibration over extended service periods.
For system-level frequency control, users can opt for digital pulling through I²C or SPI, allowing precise trim and calibration processes without altering the reference device. The ENDR-TTT caters to aerospace, defense, and industrial GNSS receivers seeking low power consumption, seamless integration, and timing reliability in challenging environments.
The ENDR-TTT is currently available for sampling, with mass production slated for Q1 2026.
Filed Under: Active Components, Military, Oscillators, Tools
