SiT5155 Precision MHz Super-TCXOs

By SiTime 73

SiT5155 Precision MHz Super-TCXOs

The SiT5155 Super-TCXO from SiTime Corporation is engineered for high-accuracy GNSS systems in precision farming, survey, construction, and other industrial equipment. Based on SiTime's unique DualMEMS™ temperature sensing and TurboCompensation™ technology, this device delivers exceptional dynamic performance that enables the fastest lock to satellites in the presence of shock, vibration, rapid temperature change, power supply noise, and electromagnetic interference (EMI). The SiT5155 further minimizes the loss of satellite lock by eliminating activity dips and micro-jumps.

By leveraging SiTime's unique DualMEMS temperature sensing and TurboCompensation technology, the SiT5155 delivers the most stable timing in the presence of environmental stressors – air flow, temperature perturbation, vibration, shock, and electromagnetic interference (EMI). This device also integrates multiple on-chip regulators, providing power supply noise filtering and eliminating the need for a dedicated external LDO. SiT5155 can be factory-programmed to any combination of frequency, stability, voltage, and pull range. This programmability enables designers to optimize the clock configuration while eliminating the long lead time and customization cost associated with quartz TCXOs where each frequency is custom built.

Block Diagram

Features and Benefits
  • Exceptional dynamic stability under airflow, fast temp. ramp
    • ±500 ppb overtemp. stability
    • 3e-11 ADEV at 10 second average time
    • ±15 ppb/°C frequency slope (ΔF/ΔT), 10°C/min ramp:
      • Enables fastest satellite lock under any operating conditions
  • 20x better phase noise under vibration
    • Minimizes loss of satellite lock in high-vibration environments
  • No activity dips or micro-jumps
    • Eliminates the need for costly screening or burn-in test
  • 0.2 ps/mV power supply noise rejection (PSNR)
    • Reduces BOM by eliminating a dedicated LDO for the TCXO
  • LVCMOS or clipped sinewave output
    • Optimized for the best balance between EMI and jitter
  • Digital frequency tuning through I2C
    • Eliminate frequency shift caused by board noise
  • Superior reliability
    • 1 billion hours MTBF
    • Lifetime warranty: reduces repair costs and field failures due to clock components
Applications
  • Industrial GNSS
  • Telecom GNSS
  • Precision GNSS
  • GPS/GNSS modules

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