GPS World

Tag: TCXO

  • SiTime unveils interference-resilient precision timing solution

    SiTime unveils interference-resilient precision timing solution

    Endura Super-TCXO Delivers Superior Holdover and Ruggedized Performance for Aerospace, Defense and Industrial Applications

    SiTime Corporation has launched the Endura temperature-compensated oscillator (Super-TCXO), ENDR-TTT,  for position, navigation and timing (PNT) applications. Engineered for superior holdover — uninterrupted operation when GNSS is not available — and resistance to jamming and spoofing, ENDR-TTT is an ultra-stable, low-power product for GNSS receivers in aerospace, defense and industrial markets.

    “SiTime’s Endura Super-TCXO, ENDR-TTT, allows us to create a multi-layer anti-spoofing methodology,” said Paul McBurney, GPS World Editorial Advisory Board member, CTO and co-founder at OneNav. “The first layer minimizes the search window, preventing spoofing because signals outside the window are never tracked. The second layer addresses exceptionally large search windows, such as in first acquisition, where spoofers can be tracked. In this case, the spoofer signals can be identified and removed due to SiTime’s ultra-stable reference clock.”

    When GNSS signals are dropped because of unavailability or degradation — including signal jamming or extreme environmental conditions — holdover maintains timing stability locally to enable uninterrupted network operation. The ENDR-TTT Endura Super-TCXO provides up to 20x longer holdover and 20x better PNT accuracy, dramatically improving spoofing resistance.

    “SiTime’s ENDR-TTT Endura Super-TCXO accelerates GNSS recovery by narrowing the resynchronization window, reducing spoofing and setting a new standard for ruggedized precision timing,” said Piyush Sevalia, executive vice president of marketing at SiTime. “Our latest product delivers a powerful combination of superior performance, low power and small size, that leads the industry for PNT applications.”

    Additional features for SiTime ENDR-TTT Endura Super-TCXO include:

    • ±50 ppb stability over temperature (FvT); up to 10x better frequency stability over temperature versus quartz alternatives.
    • -55ºC to +125ºC operating temperature range.
    • 30,000 g operational shock; up to 20x better resistance to shock.
    • 0.004 ppb/g typical g-sensitivity; up to 50x better than quartz alternatives.
    • ±0.5 ppm 20-year aging—eliminates field recalibration.
    • Optional I2C/SPI digital pulling capability for system frequency fine-tuning.

    SiTime’s ENDR-TTT is sampling now. Mass production is expected in the first quarter of 2026.

  • Schweitzer Labs Adds PTP Support to Network Clock

    Schweitzer Labs Adds PTP Support to Network Clock

    Graphic: Schweitzer Labs

    Schweitzer Engineering Laboratories, Inc. (SEL) has added support for the Precision Time Protocol (PTP) to its SEL-2488 Satellite-Synchronized Network Clock. In a single clock, users can now synchronize end devices with sub-microsecond accuracy using demodulated IRIG-B and/or PTP. The SEL-2488 can meet all the timing needs of industrial and utility applications.

    The SEL-2488 offers security features, including Satellite Signal Verification in which the clock uses two satellite constellations to validate time signals, providing a layer of protection from GPS spoofing attacks. For fault tolerance, customers can opt for a second, redundant hot-swappable power supply, which can be connected to a second power input source. If GPS is lost, the clock switches to a standard TCXO holdover with 36-microsecond-per-day accuracy or an optional OCXO holdover with 5 microsecond average accuracy. The clock operates over a wide temperature range of –40° to +85°C (–40° to +185°F) and is backed by SEL’s 10-year, no-questions-asked worldwide warranty.

    In addition to providing IRIG-B and NTP outputs, the SEL-2488 can now serve as a PTP grandmaster clock, supporting both the default profile (IEEE 1588-2008) and the power system profile (IEEE C37.238). The SEL-2488 is capable of synchronizing time for up to four independent networks with a time-stamp accuracy of 100 nanoseconds. Existing users of the SEL-2488 can purchase this as a firmware upgrade.

    “Now there’s a choice,” said Shankar Achanta, R&D manager for precise time and wireless networks at SEL. “You can use different timing protocols based on your infrastructure and application needs. The SEL-2488 is the one network clock that can meet all our customers’ timing needs.”

    The SEL-2488 was first released in September 2014. SEL included several security features such as Syslog, the Ethernet standard for event messaging, which allows the SEL-2488 to integrate smoothly into a customer’s existing event system; role-based accounts and Lightweight Directory Access Protocol (LDAP) for user authentication; and a secure HTTPS web interface, which provides a graphical SkyView display for troubleshooting signal or antenna issues. The SEL-2488 also meets and exceeds IEEE 1613 Class 1, an electric transient and interference standard for communications products.

    Designed, tested and manufactured in Pullman, Wash., a standard SEL-2488 configuration, including a dual-constellation, high-gain GNSS antenna, retails for $2,700. The PTP firmware upgrade option for existing users costs $1,750. To learn more about the PTP enhancement in the SEL-2488, visit www.selinc.com/p222.

  • Connor-Winfield Offers TCXO for Compliance with ITU-T G.8262

    Connor-ML602-TCXO
    Photo: Connor-Winfield

    Connor-Winfield is offering two new temperature compensated crystal oscillator models. TL602 and ML602 TCXO models are designed for use in conjunction with 0.1-Hz (and higher ) filter bandwidths for compliance with T1-based hierarchy specifications such as ITU-T G.8262 Option 1 and 2 ECC and ITU-T G.813 Option 1 and 2 SEC, Stratum 3 for Sonet, IEEE1588 and Synchronous Ethernet. CW’s TCXO line utilizes analog temperature compensation for excellent short-term stability characteristics, the company said.

    The TL602 and ML602 TCXOs maintain 280-ppb pk-pk frequency stability over the industrial temperature range of -40 to +85C. They are also excellent frequency reference choices for small cell, wireless and instrumentation applications, Connor-Winfield said.

    Features:

    • Available frequencies are 10 MHz, 12.8 MHz, 19.2 MHz, 19.44 MHz, 20 MHz and 24.576 MHz.
    • LVCMOS or clipped sine.
    • Fixed output or Voltage control.
    • Meets MTIE and TDEV masks measured at 0.1-Hz bandwidth.
    • Short term stability 1×10-10 performance.
    • 280-ppb peak-to-peak temperature stability over the full industrial temperature range.
    • Sub-300 ps jitter performance over 12 kHz-20 MHz band.
    • Lifetime accuracy of +/- 4.6 ppm.
    • Full ROHS and REACH compliance.
    • 7×5 mm (TL602) or 5×3.2 mm (ML602) packaging options.
  • Connor-Winfield Offers COSPAS-SARSAT TCXO for Emergency Distress Transmitters

    Connor-Winfield Offers COSPAS-SARSAT TCXO for Emergency Distress Transmitters

    CSB-Photo-W
    photo: Connor-Winfield

    COSPAS-SARSAT beacons are battery operated emergency distress transmitters for locating ships or persons when time is critical for survival.  The new Connor-Winfield series CSBxx Series are Surface Mount, 5x7mm, 3.3V, LVCMOS or Clipped Sinewave Temperature Compensated Crystal Oscillators (TCXO) designed to be emergency beacon frequency references requiring tight ± 0.2 ppm frequency stability and frequency slope control of only ±0.7 ppb/min.

    The low power dissipation of 6mW allows it to power-up immediately with an accurate frequency. Class 1 devices operate over –40°C to 55°C and Class 2 devices operate–20°C to 55°C. Standard frequencies are 10.0, 12.688375, 12.688575, 12.688656, 12.68875, 16.367, and 20.0 MHz. To save time during the beacon certification process, temperature test data is available from a special on-line URL for each serialized TCXO.

    Features:

    • 3.3 Vdc Operation
    • Frequency Stability: ± 0.20 ppm
    • Mean Slope = ±0.7 ppb/min
    • Temperature Ranges Available:
    • Class I -40 to 55°C , Class II -20 to 55°C
    • LVCMOS or Clipped Sinewave Output
    • Ceramic Surface Mount Package
    • Tape and Reel Packaging
    • RoHS Compliant / Pb Free
    • Each unit is serialized and data is available on-line
  • Rakon Launches Low Voltage Miniature TCXO

    Rakon Launches Low Voltage Miniature TCXO

    Photo: Rakon
    Photo: Rakon

    Rakon has launched the RIT2016C model TCXO for GPS applications. The RIT2016C minimizes power consumption in portable devices to extend the battery life while still delivering performance.

    Operating at a 1.2V supply voltage, the RIT2016C reduces power consumption even further with the additional benefit of the enable-disable mode to deliver better power management, the company said.

    The RIT2016C is available in the small form factor 2.0 x 1.6 millimeters.

    Current available frequencies are 19.2MHz, 26.0MHz and 38.4 MHz; other frequencies are available upon request.

    The RIT2016C also has the following features:

    • Frequency ranges available from 19 to 40 MHz.
    • Frequency versus temperature stability as tight as ±0.5 ppm over -40 to 85°C.
    • Low start-up drift rate.
    • Excellent phase noise performance.
    • Low aging: Long term stability better than ±1ppm/year.
    • Low profile: Height less than 0.8mm.

    The high performance of the RIT2016C establishes it as the perfect solution for applications with stringent battery life requirements. It is suitable for smart meters, personal navigation devices, smartphones, tablets, and fitness watches.