SIT5543

The Endura™ ruggedized SiT5543 Super-TCXO® provides ±5 ppb stability over temperature, from -40°C to 95°C, delivering OCXO-level frequency stability without the use of custom-made, low g-sensitivity quartz OCXOs. The MEMS-based SiT5543 is ideal for PNT, aerospace-defense networking and communication systems. In a small 5 x 7 mm footprint and 2 mm high ceramic package, the SiT5543 is ideal for replacing bulky, less-robust, and power-consuming quartz OCXOs. The SiT5543 is 40% smaller, 100x more resilient, and up to 2x lower power.

This Super-TCXO is engineered for exceptional dynamic performance—offering the most stable timing in the presence of environmental stressors such as airflow, temperature perturbation, vibration, shock, and EMI. It delivers ±0.3 ppb/°C typ. frequency slope (dF/dT), 1.5e-11 ADEV at 10 second averaging time and 0.01 ppb/g acceleration sensitivity.

The SiT5543 is 100% screened through the SiTime Endura process flow to provide high reliability. It can be factory-programmed to a variety of configurations, eliminating the long lead time and customization costs of quartz products.

Exceptional dynamic stability under airflow, fast temp. ramp

• ±5 ppb over-temp. stability from -40°C to 95°C 
  
• ±0.3 ppb/°C frequency slope (ΔF/ΔT), 10°C/min ramp, ensures performance under fast temp. transients
  
• ±150 ppb 20-year aging, 16x better than quartz, eliminates in-factory calibration required with less stable devices
  
• 1.5e-11 ADEV at 10 second averaging time
  

40% smaller and 2x lower power than comparable OCXOs

• 110 mW typical power consumption (2.5V)
  
• Robust 7.0 mm x 5.0 mm ceramic package, insensitive to board bending stress, reducing PCB layout constraints
  
• Ideal for replacing larger power-hungry quartz OCXOs 
  

Better acceleration sensitivity and 20x better phase noise under vibration

• 0.01 ppb/g g-sensitivity, per IAW MIL-PRF-55310 section 4.18.8.3.1
  
• Minimizes packet loss in high-vibration environments
  

No activity dips or microjumps

• Eliminates any need for costly screening or burn-in tests
  

0.2 ps/mV power supply noise rejection (PSNR)

• Reduces BOM by eliminating a dedicated LDO for TCXO
  

LVCMOS or clipped sinewave output

• Optimize for best balance between EMI and jitter
  

Programmable features

• Any frequency between 1 to 60 MHz
  
• 2.25 to 3.63 V
  
• Wide pull range
  

Digital frequency tuning through I2C

• Digital control eliminates frequency shift caused by board noise
  
• No frequency-pull non-linearity, improves dynamic performance in closed-loop applications
  
• 5 ppt resolution minimizes time error in synch applications
  
• ±6.25 to ±3200 ppm range provides designers flexibility and optimal system performance
  

Superior reliability

• 2 billion hours MTBF
  
• 20x higher shock survivability
  
• Lifetime warranty
  
• Reduces field failures due to clock components and associated trouble shooting and repair costs