[SI-LIST] Crystal Oscillators

From: "Steinkogler, Gary" <gsteinkogler@xxxxxxxxxxxxxxxxxxxx>
To: "'si-list@xxxxxxxxxxxxx'" <si-list@xxxxxxxxxxxxx>
Date: Thu, 2 Aug 2001 19:39:08 -0500


> I am looking for crystal oscillators in a 5 x 7mm package in
> frequency ranges of < 40MHz and < 80MHz - value not important.  What I am
> looking for are oscillator manufacturers that hopefully have low? (lower)
> emissions.  I have 3 specs that I look for in an oscillator:
> 
>       1.      edge rates - rise/fall time
>       2.      drive capability - 15pF, 50pF, etc
>       3.      Icc = input current consumption.  
>                       I have looked at many manufacturers and have found
>                       many stating Icc of 20-25mA if <40MHz and 25-40mA if
> <80MHz.  
>                       I found one manufacturer, Corning-Oak, PXO 033
> Micro57, whose 
>                       edge rates are the same as many others (6-7nSec),
> but when they 
>                       spec the input current at 8mA max < 40MHz and 16mA
> max if 
>                       < 80MHz, I wonder why the difference?  Are the other
> manufacturers 
>                       just over specifying to protect themselves? - if so
> why not Corning-Oak? 
>                       I have been told that they doubt the current would
> be 12mA on a 
>                       20mA speced part. 
> 
>                       My feeling is - if Corning-Oak is pulling less
> current off the power rail,
>                       that maybe they aren't driving circuitry inside the
> package as hard.  
>                       Hopefully this means less emissions.  I will be
> trying this in our screen 
>                       room in the next couple of weeks, but in the
> meantime, has anyone
>                       found other manufacturers with low/lower current
> draw?
> 
>       Gary   
> 
> > Gary Steinkogler
> > Optical Solutions
> > 16305 36th Ave. North
> > Suite 300
> > Minneapolis, MN  55446-2698
> > Phone:   (763) 268-3633
> > Fax:   (763) 268-3301
> > Main:   (763) 268-3300
> > 
> > email:gsteinkogler@xxxxxxxxxxxxxxxxxxxx
> > 
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[SI-LIST] Crystal Oscillators

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