Ruggedized Oscillators / TCXOs / OCXOs

Endura Epoch Platform™ MEMS OCXOs (oven-controlled oscillators) solve the long-standing problems of legacy quartz OCXOs which are sensitive to environmental stressors and are difficult to use. These OCXOs boost the resilience of PNT systems by providing reliable holdover if the system loses the GPS signal. In addition to increased robustness, Endura OCXOs deliver improved size, weight, and power (SWaP). Compared to traditional g-sensitivity rated quartz OCXOs, Endura OCXOs provide the following benefits.
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• Up to 70X better g-sensitivity 
• Up to 30X higher shock survivability, rated at 20,000 g 
• Up to 20X better frequency over temperature
• Up to 4X better Allan deviation
• Up to 20X smaller footprint at 9.0 x 7.0 mm and lower height at 3.6 mm
• Up to 300X less weight than vibration compensated designs, at 0.35 grams
• Up to 2X lower power, rated at 420 mW 
• Unmatched ease-of-use, eliminates restrictions on PCB placement, minimal shielding needed for thermal isolation

Endura low phase noise MHz Super-TCXOs combine low phase noise, tight frequency stability over temperature and low g-sensitivity in a single 5032 footprint-compatible device. With phase noise virtually insensitive to vibration compared to up to 20 dBC/Hz jump for quartz, there is no need to derate phase noise to compensate for vibration.

• Best acceleration sensitivity, 0.01 ppb/g – 50x better than quartz
• -159 dBc/Hz phase noise at 10 kHz offset for 19.2 MHz carrier frequency  
• -172 dBc/Hz broadbase phase noise for 19.2 MHz carrier frequency  
• ±0.1 ppm frequency stability over -40 to 105C with no frequency jump
• Low Allen deviation (ADEV), 1E-11, 10s averaging time – fewer errors in processing signals with long integration time
• Low power supply noise rejection (PSNR), 0.1 ps/mV
• I2C or SPI digital frequency tuning eliminates external DAC and sensitivity to board noise

Endura ruggedized Super-TCXOs are tight stability (±0.05 ppm to ±2.5 ppm), 1 to 220 MHz precision oscillators, engineered to deliver the most stable timing under environmental stressors – airflow, rapid temperature change, shock, vibration, poor power supply, and EMI.

• Best acceleration sensitivity, 0.004 ppb/g (typ) – 50x better than quartz
• 30,000g mechanical shock and 70g vibration resistance
• Airflow and thermal shock resistant, 0.9 ppb/°C (ΔF/ΔT)
• Excellent Allen deviation (ADEV), 1.5e-11, 10s averaging time
• Low power supply noise rejection (PSNR), 0.2 ps/mV
• I2C digital frequency tuning eliminates external DAC and sensitivity to board noise

SiTime offers ruggedized single-ended Endura oscillators for defense and aerospace applications with a wide range of features. These devices deliver the perfect combination of wide frequency range (1 to 137 MHz), excellent stability (±20 ppm), and wide temperature range (-55 to 125°C) – in any combination.

• Low acceleration sensitivity, 0.1 ppb/g
• Wide operating temperature, -55 to +125°C
• Industry-standard QFN packages, as small as 2.0 mm x 1.6 mm
• SOT23-5 leaded package for higher board-level reliability and manufacturability
• FlexEdge™ configurable rise/fall time for EMI reduction

SiTime offers Endura high-performance differential oscillators for high reliability aerospace and defense applications. These ruggedized devices provide low jitter and power supply noise rejection (PSNR) in the presence of environmental hazards, such as shock, vibration, noisy power supply, and EMI.

• Low acceleration sensitivity, 0.1 ppb/g
• Low 0.21 ps RMS jitter (typ.) in small industry-standard packages
• ±10 ppm with better dynamic stability in harsh environmental conditions
• Precise frequency steering, digital tuning to ±5 ppt
• Any frequency from 1 MHz to 725 MHz with 6 decimal places of accuracy

Endura ruggedized 32.768 kHz Super-TCXO is designed for pulse-per-second (pps) timekeeping in aerospace, defense and other applications that operate in harsh environments.

• 25x better stability compared to quartz
• Wide operating temperature, up to -55 to +105°C
• Best-in-class 20 ppb/g g-sensitivity for resilience in high vibration environments
• Low 2-ns RMS phase jitter
• 6.0 µA power consumption, 30x lower than quartz

SiTime's Endura DCXOs enable users to program output frequency and pull frequency in-system using a digital interface (I2C or SPI), offering designers great flexibility for noiseless clock synchronization. This ruggedized family offers ultra-low acceleration sensitivity and low jitter.

• Ideal for replacing multiple timing components in systems that support multiple frequencies
• Any-frequency mode for programming output frequency via I2C or SPI from 1 MHz to 725 MHz
• Frequency pulling/tuning up to ±3200 ppm via I2C or SPI with 0.005 ppb resolution and <1% linearity
• Low 0.21 ps RMS (typ.) integrated phase jitter
• Low acceleration sensitivity, 0.1 ppb/g

SiTime Endura VCXOs provide exceptional dynamic performance and high reliability for defense and aerospace applications. These ruggedized devices are engineered to maintain phase noise performance and frequency tuning accuracy in harsh environmental conditions.

• Any frequency from 1 MHz to 725 MHz in 1 Hz step
• Wide pull range, ±25  to ±3200 ppm, with <1% linearity
• Low jitter, 0.21 ps RMS (12k to 20MHz)
• Low power supply noise rejection (PSNR), 0.05 ps/mV
• Low acceleration sensitivity, 0.1 ppb/g

SiTime’s Endura EMI-reduction oscillators ensure emissions compliance through two techniques: spread spectrum clocking and rise/fall time adjustment of the clock signal. These ruggedized devices, engineered for harsh environments, have ultra-low acceleration sensitivity and high temp operation.

• EMI reduction up to 17 dB on fundamental frequency and 30 dB on harmonics
• Wide spread range, up to 4% pk-to-pk
• FlexEdge™ configurable rise/fall time options: 0.25 ns to 40 ns slew rates
• Low acceleration sensitivity, 0.1 ppb/g
• Wide operating temperature, -55 to +125°C
• Small industry-standard QFN packages, as small as 2.0 mm x 1.6 mm