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Jackson Labs Technologies touts complete GPSDO reference

Posted: 02 Oct 2012 ?? ?Print Version ?Bookmark and Share

Keywords:GPSDO reference? GPS receiver? LC_XO? WAAS?

Jackson Labs Technologies Inc. has released its LC_XO 10MHz frequency and timing reference that integrates a GPS receiver, power supplies and an ovenized, disciplined crystal oscillator in a sub 1 x 1in footprint. The reference is a highly integrated Global Positioning System Disciplined Oscillator (GPSDO) using a 50 channel GPS receiver with WAAS to discipline an OCXO or TCXO to typically better than 0.5ppb frequency accuracy.

By combining a GPS receiver, oscillator, power supplies and disciplining firmware onto a sub 1in2 PCB customers can replace legacy OCXOs with a unit that uses significantly less power, has lower height, and provides atomic clock frequency accuracy.

The LC_XO provides better than 1E-012 (one part per trillion) frequency accuracy averaged over 24 hours, and can be soldered or socketed onto a customers' PCB. The LC_XO only requires the user to connect a GPS antenna signal and 3.3V power for operation. LC_XO is available in 10MHz and 16MHz versions from stock and custom-frequencies can be ordered.

The LC_XO is a true disciplined oscillator rather than numerically controlled oscillators (NCO), and does not suffer from phase noise, jitter, frequency discontinuities and spurs that GPS NCO products are typically burdened with. The phase noise of the TCXO version at 100Hz is -132dBc/Hz, the noise floor is -158dBc/Hz, and the typical short-term average frequency accuracy and stability is better than 0.1ppb when locked to GPS. The LC_XO is configured with an OCXO by default, and can optionally be delivered in a low-cost, low-power TCXO version with instant-on performance.

The TCXO version consumes less than 0.5W, operates from a single 3.3V power supply and provides two serial interfaces for SCPI control and NMEA 0183 navigation output. LC_XO is available in 0C to 60C, or -25C to 75C versions. A Lock/Alarm indicator output and firmware upgrade capability is built-in. Standard NMEA-0183 serial output sequences allow the unit to be used as a generic 50-channel WAAS/EGNOS/MSAS-enabled GPS receiver providing position, velocity and time (PVT) solutions. Electronic ageing compensation of the internal crystal allows holdover operation in scenarios where the GPS antenna is connected only for short yearly calibration cycles rather than continuously.

LC_XO samples ship from stock.





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