Hi,  I do a lot of point to point wiring for prototyping and I have a
MAX3707 real time clock module.and it says in the data sheet that the 32
khz clock crystal must be qrounded some way. Can I wrap a piece of wire
around the can a solder it to the ground leg coming out of my voltage
regulator and achieve the ground for accurate timing? Thank You Michael
Johnston

On Mon, Jan 30, 2017 at 9:18 AM, Van Horn, David <
david.vanhorn@backcountryaccess.com> wrote:

> Sure they are.  You just have to ask.
> http://www.digikey.com/product-detail/en/abracon-llc/
> ABLSG-4.9152MHZ-D2Y-T/535-10597-2-ND/2344537
>
> There are similar packages available from companies like ECS with four
> leads, two are ground.
>
>
> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
> Of Justin Richards
> Sent: Monday, January 30, 2017 8:12 AM
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] Grounding the Xtal's metal cans
>
> It seems odd to me that they are not manufactured as standard with three
> pins knowing that it may be an issue and may be required to ground the ca=
se
> in certain applications.
>
>
>
> On 30 January 2017 at 22:52, Van Horn, David < david.vanhorn@
> backcountryaccess.com> wrote:
>
> > You frequently see grounded cans in radio receiver and transmitter
> > circuits.
> > It is easy to order them with leads to ground the can, I have several
> > custom crystals in my current project with that feature.
> >
> > -----Original Message-----
> > From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
> > Behalf Of Sean Breheny
> > Sent: Saturday, January 28, 2017 11:09 PM
> > To: Microcontroller discussion list - Public.
> > Subject: Re: [EE] Grounding the Xtal's metal cans
> >
> > If you don't ground the can then the stability and repeatability of
> > the crystal frequency will not be as good as it can be. With the can
> > ungrounded, if you listen to the crystal signal on a shortwave
> > receiver in CW or SSB modes you can hear it jump around as you touch
> > the can. Properly grounded, you can barely hear any tone pitch change
> when you touch the can.
> >
> > Sean
> >
> >
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