Uncrewed Aerial Vehicles (UAVs)

Uncrewed Aerial Vehicles (UAVs)

UAVs and drones are exposed to harsh conditions such as shock, vibration, and extreme weather. They need a ruggedized timing solution that is as tough as the environment in which they operate. SiTime Endura™ ruggedized MEMS oscillators provide robust performance with the best acceleration sensitivity, better phase noise under vibration, and excellent stability over wide temp ranges.

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SiTime Endura Ruggedized Timing Benefits

Robust in Harsh Conditions

Up to -55°C to 105°C

0.009 ppb/g g-sensitivity

70g vibration survivability

30,000g shock survivability

Jitter unchanged under vibration

1 ppb/°C dF/dT temp slope

Easy to use, simplifies design

Smaller package

Integrated LDOs and DCXO option

Fewer external components needed

No derating necessary

0.2 ps/mW PSNR

No OCXO headaches with Super-TCXOs

Higher Reliability

2B hours MTBF, <0.5 DPPM

No frequency jumps or activity dips

No cold start issues

6-sigma process control

COTS screened over temp

±400 ppb 20-year aging

UAVs Need Robust and Reliable Timing

Military uncrewed aerial vehicles (UAVs) and drones perform a variety of critical functions in tough conditions. The armed forces count on them for mission success.

UAVs must operate, navigate and communicate through take off, cruise, and landing, even in air turbulence and adverse conditions. Many functionalities are packed into a small space to make UAVs agile. Delivering stable operation, precise navigation and deterministic communication, while managing power supply noise and board layout, presents a challenge in designing the timing solution. SiTime Endura™ commercial off-the-shelf (COTS) ruggedized MEMS oscillators meet these challenges. Ruggedized Endura timing solutions are extremely reliable and remain stable and with low jitter over a wide temperature range and under severe vibrations.

Typical UAV Functional Block Diagram

Typical UAV Functional Block DiagramSiT534xSiT934xSiT534xSiT934xSiT894xSiT534xSiT934xSiT934xSiT894xsitime.com

SiTime Endura Advantages

Endura COTS ruggedized oscillators are engineered for mission critical aerospace and defense applications that operate in harsh environments.

  • Designed for wide temperature operation from -55°C to 125°C and high shock and vibration environments
  • Specified, qualified and manufactured using 6-sigma statistical process control and deliver datasheet performance with no derating
  • 100% screened with power cycle over the full temperature range to deliver low DPPM
  • Customers find that Endura MEMS oscillators operate better than military and Hi-Rel oscillators at commercial price point

Endura MEMS Timing Solutions for UAV

Devices Key Features Key Values
Single ended oscillators
SiT8944  1 to 60 MHz
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SiT8945  60 to 220 MHz
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  • ±10 ppm to ±50 ppm frequency stability over temp range
  • -55°C to 105°C
  • 0.1 ppb/g frequency stability
  • Low jitter: < 0.5 ps RMS [1]
  • 1.8 V, 2.5 V, 3.3 V
  • Better frequency and jitter margin enhance system stability and robustness
  • Easy availability of any device configuration
  • Minimizes EMI from the oscillator
Differential oscillators
SiT9346  1 to 220 MHz
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SiT9347  220 to 725 MHz
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  • Low jitter: 0.23 ps RMS [1]
  • LVPECL, LVDS, HCSL
  • 2.5 to 3.3 V
  • -40°C to 105°C
  • 3.2 x 2.5 mm package
  • Meets demanding jitter requirements
  • Small PCB footprint, easier layout
  • Easy design due to flexibility
  • MEMS reliability
DCXOs
SiT3541  1 to 220 MHz
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SiT3542  220 to 625 MHz
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  • Digital frequency control: I2C/SPI
  • ±3200 ppm pull range
  • 5 ppt resolution
  • ±10 ppm to ±50 ppm frequency stability over temp range
  • Eliminates need for external DAC to control a VCXO
  • Better accuracy, lower noise due to digital control
Super-TCXOs
SiT5146  1 to 60 MHz
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SiT5147  1 to 60 MHz
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  • ±0.5 to ±2.5 ppm stability
  • ±15 ppb/°C frequency slope
  • 0.009 ppb/g acceleration sensitivity
  • -55°C to 105°C
  • Extremely stable under shock and vibrations
  • No change in phase noise under vibrations
  • Minimizes link drops due to shock, vibration, or temperature change
  • I2C/SPI digital control to speed design
Super-TCXOs
SiT5346  1 to 60 MHz
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SiT5347  60 to 220 MHz
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  • ±0.1 to ±0.25 ppm stability
  • ±1 ppb/°C
  • 0.009 ppb/g acceleration sensitivity
  • -40°C to 105°C
  • Extremely stable under shock and vibrations
  • No change in phase noise under vibrations
  • Minimizes link drops due to shock, vibration, or temperature change
  • I2C/SPI digital control to speed design
Super-TCXOs
SiT5348  1 to 60 MHz
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SiT5349  60 to 220 MHz
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  • ±50 ppb stability
  • ±1 ppb/°C
  • 0.009 ppb/g acceleration sensitivity
  • -40°C to 105°C
  • Extremely stable under shock and vibrations
  • No change in phase noise under vibrations
  • Minimizes link drops due to shock, vibration, or temperature change
  • I2C/SPI digital control to speed design

[1] 12 kHz to 20 MHz integration range.

Endura Timing Outperforms Quartz

SiTime devices are typically smaller than crystal devices and are available in plastic packages. Due to the coefficient of thermal expansion (CTE) being closer to the CTE of a PCB, plastic packages improve the solder joint reliability compared to the ceramic packages required for crystal resonators and oscillators.

SiTime differential oscillators offer state-of-the-art jitter performance.

SiTime Endura products eliminate the headaches of quartz oscillators. They simplify design, reduce problems discovered during verification and qualification, shorten product development and time to certification, support production ramp up and continuous supply, and ease trouble shooting through the life of the product.

Endura SiT5348 Super-TCXO Frequency Stability​

Endura SiT5348 Super-TCXO Phase Noise Under Vibration​

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SiT5348 Super-TCXO Frequency Stability​

 

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SiT5348 Super-TCXO Phase Noise Under Vibration​

 

Endura Best-in-Class-Aging

Endura Lower Acceleration (g) Sensitivity

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

Endura Timing Outperforms Quartz

SiTime   Quartz

Acceleration Sensitivity

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MEMS Outperforms Quartz – Acceleration Sensitivity

 

Mechanical Shock

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MEMS Outperforms Quartz – Mechanical Shock

 

Quality

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MEMS Outperforms Quartz – Quality

Reliability MTBF (Million Hours)

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MEMS Outperforms Quartz – Reliability MTBF (Million Hours)

Tested in Accordance with MIL Specifications

MIL-PRF-55310 Test Endura Single-ended XO Endura Differential XO/VCXO/DCXO Endura 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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