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.
SiTime MEMS Timing Benefits
Precision Timing50x better acceleration sensitivity ±0.5 ppm up to 105°C No activity dips |
Most Robust in Harsh Conditions20x better mechanical shock survivability 4x better vibration resistance Extended operating temperature range |
Higher ReliabilityConforms to MIL-PRF-55310 No quartz reliability issues No cover or shielding |
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 |
|---|---|
 |
 |
MEMS Timing Outperforms Quartz
|
▀ SiTime ▀ Quartz |
|
|---|---|
Acceleration Sensitivity
|
Mechanical Shock
|
Quality
|
Reliability MTBF (Million Hours)
|
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 | ● |
