Temperature compensated crystal oscillators suit embedded applications

29th June 2022
Mick Elliott

A new range of miniature surface mount temperature-compensated crystal oscillators (TCXO) offering frequency stability from ±2.5ppm has been released by frequency control specialist Euroquartz.

The new EM211T series offers frequencies from 10 to 60MHz with CMOS outputs in a miniature 2.0 x 1.36 x 0.7mm SMD package. Standard output frequencies available are 12, 20, 24, 25, 26, 40, 50 and 60MHz.

These oscillators are ideal for use in a wide range of applications where high accuracy is important with the miniature package making these TCXOs particularly suitable for embedded systems.

With LVCMOS output into 15pF load, tolerances are available from ±2.5 to ±10ppm over the industrial temperature range (-40 to +85°C), frequency dependent. Typical SSB phase noise at 25°C ranges between -85 and -154dBc/Hz for 50MHz frequency output.

Frequency stability specifications are ±1.0ppm maximum against ageing in first year, ±0.3ppm maximum against voltage change for ±5% change, ±0.3ppm maximum against load change for ±10% change and ±1.0ppm maximum against reflow (SMD type) for one reflow, measured after 24 hours.

The components are housed in a standard format 6-pad 2.0 x 1.36mm SMD ceramic package with hermetically sealed metal lid. Power supply voltage options are 1.8, 2.5 and 3.3V ±5% with current consumption of 8mA maximum at 3.3V.

Additional specifications include rise/fall time of 10ns maximum, duty cycle of 50% ±5% as standard and output enable/disable function as standard. Initial calibration tolerance is less than ±2ppm at 25°C ±2°C. Storage temperature range is -55 to +125°C.

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