Crystal oscillators have phase noise performance for vehicles

Miniature low phase noise crystal oscillators from Mercury Electronics Europe are intended for embedded automotive applications.

The surface mount HJ22 oscillators offer 15pF load LVCMOS output at frequencies from 20 to 50MHz with typical RMS phase jitter of just 48fs and 300fs maximum. Phase noise characteristics of -153dBc/Hz at 10kHz offset and -166dBc/Hz at 100kHz offset (49.152MHz output frequency, 3.3V input model) are claimed to be “significantly better” compared with standard oscillators.

The HJ22 oscillators are housed in a small, surface mount package measuring 2.5 x 2.0 x 0.9mm. They are available with 1.8, 2.5 or 3.3V power supply requirements and offer typical current consumption of just 3mA and 5mA maximum. Frequency stability over both commercial (-10 to +70 degrees C) and industrial (-40 to +85 degrees C) can be specified as ±25, ±50 or ±100ppm as standard. Mercury Electronics Europe can also provide non-standard frequency stability specifications if required, e.g., ±20 or ±30ppm.

Other specifications include ageing of ±3ppm/year maximum for the first year, start-up time of 0.8ms typical and 5.0ms maximum. Rise/fall time are 5ns typical and 10ns maximum and they have a duty cycle (symmetry) of 50% ±5%. Output enable/disable is provided as standard.

Suitable for embedded automotive applications, the HJ22 oscillators extend the company’s HJ series which includes package sizes of 3.2 x 2.5 x 1.0mm, 5.0 x 3.2 x 1.2mm and 7.0 x 5.0 x 1.4mm.

Mercury Electronics Europe (MEC Europe) is an approved supplier to the automotive industry with IATF16949 approval.

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