Frequency

MCXO offers OCXO performance in smaller package

25th February 2014
Nat Bowers

At embedded world 2014, IQD Frequency Products has released the IQMT-100 series Microcomputer Compensated Crystal Oscillator (MCXO). Offering customers OCXO performance in a standard clock oscillator sized package, this device delivers ±50ppb stability in an industry standard sized ceramic package measuring just 7x5mm.

Operating over an industrial temperature range from -40 to +85°C, the IQMT-100 has been designed to be used in a variety of applications, including: femto, pico and micro base stations; digital switching; GPS/GNSS; microwave backhaul; digital video broadcast; satellite up converters; and environmental monitoring equipment. It is suited for use where an OCXO cannot be used due to size and power consumption restrictions and where a tight frequency stability is required which a TCVCXO cannot achieve. Consuming less than 15mA of current, the MCXO lends itself to portable use.

IQD’s IQMT-100 series is available in a range of standard frequencies including 10, 12.8, 16.320,16.3840, 19.2, 19.44, 20.0, 25.0, 26.0, 30.720 and 50MHz. Maintaining an extremely good typical short term stability of 2E-10/s, the MCXO enables output compatibility to be specified as either Clipped Sine or HCMOS with 15pF load along with 3.0, 3.3 and 5.0V supply voltages. Typical phase noise performance is -145dBC/Hz at 100kHz.

The devices also offer a voltage control option in order to control the frequency pulling to compensate for crystal ageing and varying circuit conditions with choices of either ±5 to ±10ppm or ±10 to ±15ppm. Although ageing per day is 20ppb, some specification combinations can offer 10ppb. Similarly standard ageing over one year is 1ppm although 0.5ppm can be offered for certain frequencies.

IQD will be exhibiting the IQMT-100 series MCXO at Stand 650 in Hall 4 at embedded world 2014.

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