LEO Satellite Communications

LEO satellites provide lower latency and higher bandwidth. To achieve this, they depend on ruggedized reference clocks for uplink/downlink comms and clocking the processor. These timing components must withstand high levels of vibration during launch and continued extreme temperature variations in orbit. If timing fails, receivers lose lock to satellites and navigation systems won’t receive critical data.

SiTime MEMS timing solutions are built to operate in harsh environments, overcoming the inherent weaknesses of quartz and delivering low failure rates, long-term reliability, and robust performance.

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SiTime MEMS Timing Benefits

Precision Timing

50x better acceleration sensitivity

±0.5 ppm up to 105°C

No activity dips

Most Robust in Harsh Conditions

20x better mechanical shock survivability

4x better vibration resistance

Extended operating temperature range

Higher Reliability

Conforms to MIL-PRF-55310

No quartz reliability issues

No cover or shielding

Land Defense Vehicle Communications block diagramsitime.comSiT934xSiT204xsitime.comSiT514x

Ruggedized MEMS Timing Solutions for LEO Satcom

Devices Frequency Frequency Stability Function Key Features

SiT5146 Super-TCXO

SiT5147 Super-TCXO

1 to 60 MHz

60 to 220 MHz

±0.5 to ±2.5 ppm Reference clock for uplink/downlink comms 0.004 ppb/g, ±15 ppb/°C

SiT9346 Differential XO

SiT9347 Differential XO

1 to 220 MHz

220 to 725 MHz

±10 to ±50 ppm DSP, FPGA & processor clocking 0.1 ps RMS phase jitter

SiT2044 LVCMOS XO

SiT2045 LVCMOS XO

1 to 110 MHz

115 to 137 MHz

±20 to ±50 ppm -55°C to 125°C

MEMS Timing Outperforms Quartz

Best-in-Class-Aging

Lower Acceleration (g) Sensitivity

graphs_Best-In-Class-Aging graphs_Lower_Acceleration_(g)_Sensitivity

MEMS Timing Outperforms Quartz

SiTime   Quartz

Acceleration Sensitivity

MEMS_Outperforms_Quartz_Acceleration_Sensitivity

 

Mechanical Shock

MEMS_Outperforms_Quartz_Mechanical_Shock

 

Quality

MEMS_Outperforms_Quartz_Quality

 

Reliability MTBF (Million Hours)

MEMS_Outperforms_Quartz_Reliability_MTBF

 

Conforms to 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

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