IQD Frequency Products has launched a series of oven controlled crystal oscillators (OCXOs), the IQOV-71 series, housed in a four-pad plastic package with a fibreglass base measuring 9.7×7.5mm.
According to the company the devices offer frequency stabilities down to ±10ppb over an operating temperature range of -20°C to 70°C or ±20ppb over -40°C to 85°C.
Standard frequencies available are 10MHz, 12.8MHz, 19.2MHz, 20MHz, 24.576MHz, 25MHz, 30.72MHz, 38.88MHz, 40MHz, 49.152MHz and 50MHz.
Other frequencies in the range 5MHz to 50MHz can be developed for commercially viable quantities.
Power consumption is typically less than 1W during warm-up which takes about three minutes and less than 0.4W once the device has reached steady state, claims IQD. 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 3.3V 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 <2ppb/G making the design suitable for applications such as military radios and airborne applications.
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 <1% as against a more typical 5%.
This part is intended for applications including picocells for wireless applications, satellite communication, broadcasting, microwave and instrumentation such as frequency counters and analysers.
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