Edi --
Since accuracy is not important (+/- 1%), make a simple xtal oscillator
using an unbuffered HCMOS inverter (the 74HCU04 is the classic device for
this), a bias feedback resistor, a pair of load capactiors, and, possibly, a
series resistor to limit crystal dissapation. Almost any 10MHz, parallel
cut, crystal will work. Cheap, easy, and very reliable.
Good luck, Bob Smith
--- Avoid computer viruses, Practice safe hex ---
-- Specializing in small, cost effective
embedded control systems --
http://www.smithmachineworks.com/embedprod.html
Robert L. (Bob) Smith
Smith Machine Works, Inc.
9900 Lumlay Road
Richmond, VA 23236 804/745-1065
[EMAIL PROTECTED]
----- Original Message -----
To: "Multiple recipients of list CHIPDIR-L" <[EMAIL PROTECTED]>
Sent: Friday, March 19, 2004 10:59 AM
> At 03:09 19.03.2004 -0800, you wrote:
> >On Fri, Mar 19, 2004 at 02:39:23AM -0800, Edi Im Hof wrote:
> >
> > > I need a clock source of 10MHz and I would prefer an integrated
> > > cmos-ocillator. I could also go for a quartz connected to an AD7711
from
> > > Analog Device, but I have to 'steal' the clock for a uC (5MHz or
10MHz)
> > > and a second ADC (2.5MHz). I'm a bit worried that the quartz will not
> > > start reliably. There are two problems, the temperature goes down
to -40�C
> > > and it should consume as less power as possible.
> >
> >How stable?
>
> I have a RS485 on the processor, so it should be in a range of around 1%
> over a temperature range of -40�C .. +25�C
>
> > A RC-oscillator is better in this case, maxim has
> >some integrated parts (<2% deviation) or linear.com. There are also
> >uC's that have internal RC-oscillators and a external crystal.
>
> I'm quite sure, a RC will run away in this temparature range.
>
> Edi Im Hof
>
>
> > Matthias
> >--
> >Author: Matthias Weingart
> > INET: [EMAIL PROTECTED]
> >
> >Fat City Hosting, San Diego, California -- http://www.fatcity.com
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>
>
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> --
> Author: Edi Im Hof
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--
Author: Robert Smith
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