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TAIYO YUDEN Wireless Module Series Taiyo Yuden wireless modules are compact and easy to integrate into product designs. Modules range fromBluetooth, Wi-Fi, GPS and multifunctional for applications including handheld devices, logistic terminals, printersand peripheral devices. Evaluation boards are available. More Details

June 4, 2012

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6/4/12 11:49 AMBrainstrorm: Oscillators/Timing Devices - Wireless Design & Development

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Brainstorm

Brainstrorm: Oscillators/Timing Devices

Where in the design cycle is it best to spec in a timing device, and why?

Ramon Cerda, Vice President of Engineering,Crystek Corporation

The short answer is; as soon as possible. Most, if notall timing devices should be treated as long lead-times items. If the crystal oscillatormanufacturer does not have your particular frequency and/or specification requirement instock, it can take many weeks before they can deliver the timing device. There are very fewmanufacturing short cuts in the building of a quartz crystal. The writer has firsthandexperience with important projects being delayed because of a twenty cents crystal.Throwing expediting fees at the last minute is no help. The systems/design engineers

should contact the crystal oscillator manufacturer early in the design cycle. This is important not only for havinga device in time but also to check what is the best timing unit for the specific application. As we all know,websites are sometimes difficult to maneuver and one can easily miss the best part for application. The “earlybird” can save the company money by selecting the “right” part early. Hence, speaking with an applicationengineer may get you a better performing part on time, and at the lowest cost possible. Iteration of a selectedtiming device is sometimes necessary. This may be due to improved requirements now needed but notanticipated before or a frequency change. This is like starting over and these new requirement(s) should becommunicated with the timing device manufacturer right away so they can keep up with your schedule.

David Kenny, Vice President Research & Development, Pletronics, Inc.

The best time to consider the timing device in the design cycle is at the very beginning. Toooften the assumption is made that the timing device is an off-the- shelf component. If this isthe case, it should be verified early. If this is not the case, the timing device could havesignificant lead time. Precision timing devices using quartz are dependent on the mechanicalproperties of quartz. If the particular frequency has not been previously configured, the lead-time for proper thickness blanks and associated masks can take 12-16 weeks. If the timing

device is considered early enough in the design process, it may be possible to use an existing or slightlymodified device and save time on time and cost by using the economy of scale by riding along with other timingproducts.

E.L. Fox, President, Fox Electronics

In short, the earlier in the design cycle, the better, especially with the advantages providedby today’s configurable oscillator technologies. Timing device decisions are traditionallysaved for the end stages of a design cycle, but configurable oscillator evaluation can offerunique engineering advantages when incorporated at the front end of the process.Specifically, configurable quartz oscillators provide designers with additional options, due totheir modular, flexible structure. When evaluated earlier in the design phase, configurableoscillators can be tailored to precise frequency requirements and tweaked as the designprocess evolves.

They can also be modified to accommodate changing stabilities, tolerances or power supply requirements

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6/4/12 11:49 AMBrainstrorm: Oscillators/Timing Devices - Wireless Design & Development

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They can also be modified to accommodate changing stabilities, tolerances or power supply requirementsdepending on how the design progresses. Even the form factor might be adaptable, with appropriateallowances for heat dissipation in higher power, higher frequency designs.Because the modular design of configurable oscillators utilizes stocked components in addition to aninterchangeable building-block design, designers can receive test samples in a matter of days and fullproduction runs in less than two weeks. And because these custom-tailored solutions can be delivered quicker,they are better equipped to accommodate last-minute adjustments if they consider their full range of optionsearlier in the oscillator design process.

Today’s high-quality configurable oscillators, like Fox’s XpressO family of crystal oscillators, deliver reliableperformance across a full range of target frequencies from 0.75 MHz all the way up to 1.35 GHz. They alsooffer stabilities as tight as +/-20 ppm, reduce jitter to the range of 0.3 pS to 0.5 pS, satisfy voltage requirementsdown to 1.8 V, and offer package sizes down to 3.2 mm x 2.5 mm – at costs equal to or better thanconventional quartz oscillator designs, and with very short order lead times.

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