The ruggedized Endura SiT7101 OCXO is a MEMS-based device that solves long-standing limitations of quartz OCXOs. Leveraging SiTime’s proprietary temperature-sensing technology and advanced CMOS design, it delivers excellent stability under airflow, temperature perturbation, vibration, shock, and EMI.
The SiT7101 offers industry-leading performance for holdover, stability, and SWaP. It delivers up to 8 hours of holdover (±1.5 µs) in static conditions and 6 hours in dynamic environments (8°C temperature change and 1 m/s airflow). Frequency stability options range from ±1 ppb to ±5 ppb, with a typical frequency slope (ΔF/ΔT) of ±0.01 ppb/°C. With a 420 mW steady-state power profile and exceptional g-sensitivity of 0.1 ppb/g, it supports an operating temperature range of -40°C to 95°C (extended range to 105°C available upon request).
Factory-programmable to any frequency between 10 MHz and 220 MHz, this OCXO features ±400 ppm digital frequency pulling via I²C or SPI, with fine pull resolution down to 0.05 ppt (5E-14). It supports 2.8 V and 3.3 V operation; with 2.5 V available upon request. Its 9.0 mm × 7.0 mm × 3.6 mm surface-mount package simplifies PCB placement with minimal shielding for thermal isolation. Integrated on-chip regulators further optimize PSNR and reduce system-level power noise.
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| "Specs" | "Value" |
|---|---|
| Oscillator Type | OCXO |
| Frequency | 10 to 250 MHz |
| Frequency Stability (ppm) | ±0.001 (±1 ppb), ±0.003 (±3 ppb), ±0.005 (±5 ppb) |
| Operating Temperature Range (°C) | -40 to 85, -40 to 95 |
| Package Type (mm²) | 9.0 x 7.0 |
| Voltage Supply (V) | 3.3 V Vdd with regulated output and SPI/I2C inputs |
| Features | ±20 ppt/°C frequency slope, 5E-12 ADEV, 420 mW steady state power consumption |
| Availability | Pre-Production Sampling |
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Epoch OCXO package 9.0x7.0
Benchmark holdover in real-world conditions for Assured PNT systems
- ±1.5 µs time error after 8 hours without GPS synchronization
- 6 hours holdover under dynamic conditions (8°C temperature change, 1 m/s airflow)
- 5E-12 ADEV at 10-second averaging time
Ultra-resilient operation in harsh environments
- ±1 to ±5 ppb frequency stability options from -40°C to +95°C (contact SiTime for support up to 105°C)
- ±0.01 ppb/°C frequency slope (ΔF/ΔT)
- 0.1 ppb/g g-sensitivity
- 20,000 g shock survivability
Lower size, weight, and power (SWaP)
- 420 mW typical steady-state power consumption (3.3 V)
- Compact 9.0 × 7.0 × 3.6 mm surface-mount package
Best phase noise under vibration
- -163dBc/Hz (10kHz) Fc=10MHz
- Minimizes link drops in high-vibration environments
- No activity dips or microjumps
Integrated power-supply filtering for excellent PSNR
- On-chip regulators eliminate need for dedicated LDO
- Reduces BOM and improves power integrity
Flexible output and programmable features
- LVCMOS or clipped sinewave output
- Any frequency between 10 to 220 MHz
- 2.8 V or 3.3 V supply options (contact SiTime for 2.5 V support)
- Low-noise digital frequency tuning via I²C or SPI
- ±400 ppm pull range with 5E-14 frequency pull resolution
- Assured Positioning Navigation Timing (PNT)
- Guidance Systems
- Data Communication Systems
- Radar
- Time Holdover and IEEE 1588 Synchronization
Frequency Slope (dF/dT) Calculator – Calculate frequency slope over temperature
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