Re: Smallest Xtal

On Fri, 16 Dec 2005 16:23:12 -0000, the renowned "MK"
<nospam.please@xxxxxxxxx> wrote:

>
>"Bob" <bob3635x@xxxxxxxxx> wrote in message
>news:1134731153.719531.309380@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>> I am working on a design that needs to be as small as possible. I
>> am using 0201 caps and resistors, and the smallest microcontroller
>> I can find. So now the biggest component is the crystal. What is
>> the smallest crystal package available?
>>
>> I am not too picky about the freq, something in the range of 10 to
>> 20 MHz.
>>
>There are some very small crystals available but do your sums and test them
>carefully - I've found that AVRs can be very reluctant to start with small
>crystals. It's much smaller (and cheaper) to use the built in RC oscillator
>if you can. Silabs 8051 core parts and some AVRs these are pretty good.
>
>MK

The smallest SMT crystals typically have rather low maximum power
dissipations, often <= 100uW, compared to the several mW that you can
safely pump into a HC49 can without damaging it. That means the
oscillator design is more fussy to get a circuit that will reliably
start over the temperature range without damaging it. Yeah, it's
usually just one extra resistor on the typical Pierce on-chip
oscillator, but...


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@xxxxxxxxxxxx Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
.

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