Compact, low-power OCXO suits aero/mil applications

25th August 2015
Barney Scott

IQD's latest Oven Controlled Crystal Oscillator (OCXO), the IQOV-71 series, is housed in 4-pad plastic package with a fibre glass base measuring only 9.7x7.5mm. Despite its size, the model offers very low frequency stabilities down to ±10ppb over an operating temperature range of -20 to +70°C or ±20ppb over -40 to +85°C making it a class leader for this type of high performance device.

Standard frequencies available are 10, 12.8, 19.2, 20, 24.576, 25, 30.72, 38.88, 40, 49.152 and 50MHz which will satisfy most typical applications. Other frequencies in the range 5 to 50MHz can be developed for commercially viable quantities. Critically, power consumption is typically less than 1W during warm up which only takes approximately 3 minutes and less than 0.4W once the device has reached steady state. Frequency ageing is less than 2ppb per day and a maximum of 3ppm over a 10 year period.

The IQOV-71 offers either a standard HCMOS or Clipped sinewave output, with operating voltages specified at either 3.3 or 5.0V. Low phase noise performance is assured with figures of -152dBC/Hz at 10kHz offset and only -153dBc/Hz at 100kHz from the carrier. Unusually for this type of device, the G-sensitivity is also good at less than 2ppb/G making the design suitable for applications such as military radios and airborne applications.

In order to maximise flexibility there is an option to specify external frequency adjustment by the application of a variable control voltage that allows for crystal ageing as well as changes in the circuit conditions. This variation is also extremely linear, being under 1% against a more typical 5%.

This part is intended for a wide range of applications including Picocells for the ever increasing rage of wireless applications, satcomms, broadcasting, microwave and instrumentation such as frequency counters and analysers.

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