Spread spectrum oscillator cuts height and EMI

Mercury United Electronics reckons its latest release is the smallest low-EMI spread spectrum clock oscillator available in production quantities today.

Mercury United Electronics reckons its latest release is the smallest low-EMI spread spectrum clock oscillator available in production quantities today.

The package measures 5 x 3.2 x 1.2mm with a four-pad ceramic surface mount base, and is a drop-in replacement for most existing 5 x 3.2mm conventional clock oscillators.

The EMI reduction is up to 12dB and there is no need to respin the board.

The 3HM53 Group R series is available at +3.3V with a fixed frequency range from 6 to 160MHz for both commercial (0 to +70C) and industrial (-40 to +85C) temperature ranges.

The typical startup time is only 2ms, and the cycle-to-cycle jitter is typically +/-250ps.

This outperforms larger-packaged programmable spread spectrum oscillators offered by others.

A frequency modulation technique is used with a modulation carrier frequency in the kilohertz range that is transparent to the oscillator frequency.

The controlled modulation process can be configured down from the nominal frequency (down spread) at -0.5, -1 or -3%.

This is recommended where overclocking is a problem.

A centre spread type is also available at +/-0.25, +/-0.5 or +/-1.5%.

Pricing is less than $2.00 per unit in volume quantities with a lead-time of only 5 weeks for custom frequencies.

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