Low EMI oscillators with enhanced jitter performance

09 November 2009

Euroquartz has a new range of low EMI oscillators that feature enhanced jitter performance
Euroquartz has a new range of low EMI oscillators that feature enhanced jitter performance

Euroquartz has a new range of low EMI oscillators that feature enhanced jitter performance.

As a drop-in replacement for standard clock oscillators, the 3EQHM53Y series is ideal for use in a range of applications and avoids the expense of re-designing an existing PCB.

The 3EQHM53Y series oscillators use spread spectrum (dithered) techniques to reduce EMI emissions from the oscillator by as much as 15dB. In most electronic systems, the principal cause of EMI is the system clock so it makes sense to reduce this at source rather than relying on traditional methods of patching up systems with ferrite beads, ground planes, metal shielding and similar costly additions. Spread spectrum technology spreads the mode energy over a wider bandwidth while the modulation carrier frequency, operating in the kHz region, makes the process transparent to the oscillator frequency.

Euroquartz’s new low EMI oscillators also offer enhanced jitter performance with cycle-to-cycle jitter of ±100ps typically better than half the jitter specification of standard devices.

Housed in standard 5mm x 3.2mm x 1.2mm surface mount packages, the 3EQHM53Y oscillators are a direct drop in replacement for standard oscillators that enable engineers to make an immediate impact on EMI performance.

Specifications include frequency range from 10 to 160MHz, choice of four spread types (down spread 1% and 3% and centre spread ±0.5% and ±1.5%), EMI reduction from -9dBc minimum to -15dBc minimum depending on spread type, and modulation carrier frequency from 12kHz minimum to 42kHz maximum.

Frequency stability characteristics are ±25ppm, ±50ppm or ±100ppm over both commercial (0 to 70°C) and industrial (-40 to +85°C) temperature ranges.

With their low EMI emissions and enhanced jitter performance, the new Euroquartz 3EQHM53Y series oscillators are RoHS compliant and are ideal for a range of applications including multi-function printers, digital copiers, PDAs, networking, LAN/WAN storage, computer storage systems (CD-ROM, VCD, DVD, HDD), scanners, modems, projectors, embedded systems, musical instruments, automotive electronics, GPS car navigation systems, LCD PC monitors and TVs, ADSL, PCMCIA equipment and still digital cameras.

Euroquartz is an independent UK-based manufacturer and supplier of quartz crystals, oscillators, filters and frequency-related products to the electronics manufacturing industry worldwide. The company designs and manufactures a range of frequency control components for a wide range of customers including major OEMs in a broad spectrum of applications including military and aerospace, communications, general electronics, computing, control systems and petrochemical among many others.

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