By Anonymous
January 17 2004--The Company: Mercury has been producing low EMI spread spectrum clock oscillators for three years. Packages include a 9.6x11.4x4.7mm FR4 based SMD leadless package and full & half size 4 pin DIPs. To address the market need for a smaller package size for industries such as still digital cameras, wireless LANs and LCD displays, Mercury is announcing the volume production of its HM57 (5x7x1.8 mm 4 pad ceramic leadless SMD package) spread spectrum clock oscillators. An even smaller package, HM53 (5x3.2x1.0 mm), is also in development.
The Product: The HM57 is available from 10.0 MHz to 160.0 MHz, a CMOS square wave output with a supply voltage of +3.3V, a duty cycle of 50%±5%, and spread types that include a down spread (-0.5%, -1% and -3%) and center spread (±0.25%, ±0.5% and ±1.5%). The typical cycle-to-cycle jitter is ±250 ps. The modulation carrier frequency is in the range of 23 to 48 KHz (frequency dependent). While the typical EMI reduction is 12 dB. Currently, sample lead times are 3 to 4 weeks with volume lead time at 5 to 6 weeks.
The Technology: Unlike conventional clocks whose mode energy has a narrow bandwidth and a sharp peak type, the mode energy of a spread spectrum clock is spread over a wider bandwidth, resulting from the frequency modulation technique. The modulation carrier frequency is in the KHz range which makes the modulation process transparent to the oscillator frequency. The controlled modulation process can be on all of one side of the nominal frequency (down spread) or 50% up and 50% down (center spread). The down spread is preferred if over-clocking is a problem to the system.
Related product link: http://www.mercury-crystal.com/clk_hm.htm
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By Heather Moreno, PeopleFit USA
Believe it or not, sleep has a great deal to do with how and Your body runs according to your biological clock. This A lack of sleep can affect your weight in two ways:
1.People who lack sleep are more likely to overeat. Your 2.When you get enough sleep you replenish your energy Consider the following:
*What time do you get up? Go to bed? You might notice some changes need to be made. While Heather Moreno is a CPA escapee who followed her
what you eat and maintaining your weight.
clock is difficult if not impossible to change. So, you must
create your lifestyle around this internal clock. Most of us
structure our sleep around our work, family and home life
with less thought to what our bodies need – we’re dealing
with life. But there is good incentive to make a change.
ability to be in tune to hunger is diminished and research
shows that sleep-deprived people tend to eat 15% more food
than those who get the sleep they need. Many go for high-
sugar comfort foods, like cookies and candy, for a quick
energy boost. In a sleep-deprived state, the body will store
more calories as fat thinking a crisis is near. Ugh!
stores and your hormones stay in check. When you are
sleep deprived the hormone cortisol rises in your body,
indicating stress. When cortisol remains high it stimulates
your appetite for high sugar foods and it also causes the
body to store more fat in the abdominal area. Lack of sleep
can lead to weight gain!
*How many hours of sleep do you average?
*How many hours of sleep do you need?
*Based on the hours of sleep you need, what time is
ideal for you to go to bed? To get up?
you may not be able to reach your ideal habits right now,
making small changes in sleeping habits can help, especially
during the crazy schedules the holidays bring.
passion for fitness. She is certified by the American
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Exercise. Heather is president of PeopleFit USA…
getting you fit in 20 minutes a week over the phone. If
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