Ruggedized GNSS
GPS receivers are essential for military navigation, and accurate timing is essential to the GPS system. Precision timing components must provide the highest stability in the most dynamic conditions. If timing fails, receivers lose lock to satellites and navigation systems won’t receive critical data.
SiTime ruggedized Endura™ timing solutions are built to reliability operate in harsh environments, overcoming the inherent weaknesses of quartz and delivering robust performance—even under high levels of mechanical shock and vibration or extreme and rapidly changing temperatures.
SiTime Ruggedized Endura MEMS Timing Benefits
Precision Timing±100 ppb from -55°C to 105°C Maintains stable satellite link 3.5 ppb/°C dF/dT, no lock loss under dynamic conditions No Activity dips or micro jumps |
Most Robust in Harsh ConditionsBest acceleration sensitivity, 0.004 ppb/g Hermetically sealed, heat resistant Extended operating temp range Best performance under shock & vibration |
Higher ReliabilityConforms to MIL-PRF-55310 1,900M hours MTBF 30,000 g mechanical shock survivability No cover or shielding needed |
Ruggedized GNSS Block Diagram
Endura MEMS Timing Solutions for GPS
| Devices | Frequency Stability | Function | Key Features |
|---|---|---|---|
|
Super-TCXOs
SiT5146 1 to 60 MHz
SiT5147 60 to 220 MHz
SiT5346 1 to 60 MHz
SiT5347 60 to 220 MHz
SiT5348 1 to 60 MHz
SiT5349 60 to 220 MHz
|
±0.5 to ±2.5 ±0.5 to ±2.5 ±0.1 to ±0.25 ±0.1 to ±0.25 ±0.05 ±0.05 |
Synchronous System | 1 to 220 MHz, 0.004 ppb/g, ±100 ppb, ±1 ppb/°C |
|
32.768 kHz TCXO
|
±5 | Time-keeping | 32.768 kHz, ±5 ppm, 2.5 ns RMS IPJ, 1.2 mm2 CSP |
Endura Timing Outperforms Quartz
Best-in-Class-Aging |
Lower Acceleration (g) Sensitivity |
|---|---|
|
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Endura Timing Outperforms Quartz
Acceleration Sensitivity
Mechanical Shock
Quality
Reliability MTBF (Million Hours)
Tested in Accordance with MIL Specifications
| MIL-PRF-55310 | Test | Single-ended XO | Differential XO/VCXO/DCXO | TCXO |
|---|---|---|---|---|
| 3.6.40.1 | Shock | ● | ● | ● |
| 4.8.18.3.1 | g-Sensitivity | ● | ● | ● |
| 3.6.34.1 | Frequency aging | ● | ● | ● |
| 3.6.17.1 | g-Sensitivity, constant acceleration | ● | ● | ● |
| 3.6.38.3 | Phase noise under vibration | ● | ● | ● |
| 3.6.10.2 | Frequency-temperature stability with hysteresis | ● | ● | ● |
| 3.6.45.2 | Ambient pressure | ● | ● | ● |
| 3.6.16.5 | Allan deviation | n/a | n/a | ● |
| 3.6.10.4 | Frequency-temperature stability with hysteresis and trim effect | n/a | ● | ● |
| 3.6.15 | Retrace | n/a | n/a | ● |
| 3.6.30.7 | Modulation frequency response | n/a | ● | ● |
| 3.6.41.1 | Acceleration survivability | ● | ● | ● |
| 3.6.7 | Frequency warm up | n/a | n/a | ● |
