Ruggedized GNSS

Soldier is Using Laptop Computer and Radio for Communication During Military Operation in the Desert

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.

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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 Conditions

Best acceleration sensitivity, 0.004 ppb/g

Hermetically sealed, heat resistant

Extended operating temp range

Best performance under shock & vibration

Higher Reliability

Conforms 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
SiT5146  1 to 60 MHz
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SiT5147  60 to 220 MHz
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SiT5346  1 to 60 MHz
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SiT5347  60 to 220 MHz
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SiT5348  1 to 60 MHz
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SiT5349  60 to 220 MHz
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±0.5 to ±2.5

±0.5 to ±2.5

±0.1 to ±0.25

±0.1 to ±0.25



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


Lower Acceleration (g) Sensitivity

SiTime – Best-in-Class Aging
SiTime – Lower Acceleration (g) Sensitivity

Endura Timing Outperforms Quartz

SiTime   Quartz


Acceleration Sensitivity

MEMS Outperforms Quartz – Acceleration Sensitivity

Mechanical Shock

MEMS Outperforms Quartz – Mechanical Shock


MEMS Outperforms Quartz – Quality

Reliability MTBF (Million Hours)

MEMS Outperforms Quartz – Reliability MTBF (Million Hours)

Tested in Accordance with MIL Specifications

MIL-PRF-55310 Test Single-ended XO Differential XO/VCXO/DCXO TCXO Shock g-Sensitivity Frequency aging g-Sensitivity, constant acceleration Phase noise under vibration Frequency-temperature stability with hysteresis Ambient pressure Allan deviation n/a n/a Frequency-temperature stability with hysteresis and trim effect n/a
3.6.15 Retrace n/a n/a Modulation frequency response n/a Acceleration survivability
3.6.7 Frequency warm up n/a n/a
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