CD4060 Xtl Osc. Circuit
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From: John Fields on 14 Mar 2010 19:44 On Sun, 14 Mar 2010 16:27:03 -0700, Joerg <invalid(a)invalid.invalid> wrote: >John Fields wrote: >> On Sun, 14 Mar 2010 10:46:33 -0700, Jim Thompson >> <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com> wrote: >> >>> On Sun, 14 Mar 2010 12:17:10 -0500, John Fields >>> <jfields(a)austininstruments.com> wrote: >>> >>>> On Sun, 14 Mar 2010 09:29:36 -0700, Jim Thompson >>> My resistors are always on-chip :-) >> >> --- >> Sometimes mine are, sometimes they aren't. ;) >> > >Currently most of mine are in neatly labeled bins :-) --- Hadn't thought about that; so are mine, :-) JF
From: John Larkin on 15 Mar 2010 15:20 On Sat, 13 Mar 2010 12:37:57 -0600, "krw(a)att.bizzzzzzzzzzzz" <krw(a)att.bizzzzzzzzzzzz> wrote: >On Sat, 13 Mar 2010 09:05:24 -0800, John Larkin ><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > >>On Sat, 13 Mar 2010 08:42:27 -0800, Fred Abse >><excretatauris(a)invalid.invalid> wrote: >> >>>On Fri, 12 Mar 2010 16:28:07 -0800, John Larkin wrote: >>> >>>> I never buy crystals for things like this. They have a high probability of >>>> not working, and you wind up fiddling with capacitors and such. It's >>>> easier to but a packaged, working crystal oscillator, already tuned to a >>>> couple PPM, guaranteed to oscillate, for $1.50 or thereabouts. >>> >>>Me, too. Amplifiers oscillate, oscillators don't ;-) >> >>We've just started using silicon oscillators, in SOT-23 sized >>packages, for things where 1% is good enough. We're using one part >>that's pin strappable for 8-4-2-1 MHz. > >A seven pin SOT-23? It's an LTC6930CMS8-8.00, in the MSOP8 package. It's basically an 8 MHz oscillator with three pins that can be strapped to divide by 1 through 128. Frequency is +-0.09% at room temp, plenty good for UARTS and most timing apps. John
From: John Fields on 15 Mar 2010 16:06 On Mon, 15 Mar 2010 12:20:11 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Sat, 13 Mar 2010 12:37:57 -0600, "krw(a)att.bizzzzzzzzzzzz" ><krw(a)att.bizzzzzzzzzzzz> wrote: > >>On Sat, 13 Mar 2010 09:05:24 -0800, John Larkin >><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >> >>>On Sat, 13 Mar 2010 08:42:27 -0800, Fred Abse >>><excretatauris(a)invalid.invalid> wrote: >>> >>>>On Fri, 12 Mar 2010 16:28:07 -0800, John Larkin wrote: >>>> >>>>> I never buy crystals for things like this. They have a high probability of >>>>> not working, and you wind up fiddling with capacitors and such. It's >>>>> easier to but a packaged, working crystal oscillator, already tuned to a >>>>> couple PPM, guaranteed to oscillate, for $1.50 or thereabouts. >>>> >>>>Me, too. Amplifiers oscillate, oscillators don't ;-) >>> >>>We've just started using silicon oscillators, in SOT-23 sized >>>packages, for things where 1% is good enough. We're using one part >>>that's pin strappable for 8-4-2-1 MHz. >> >>A seven pin SOT-23? > >It's an LTC6930CMS8-8.00, in the MSOP8 package. It's basically an 8 >MHz oscillator with three pins that can be strapped to divide by 1 >through 128. --- That's not quite true, since it can only divide by 1, 2, 4, 8, 16, 32, 64, or 128 depending on the settings of the DIV pins, as shown on page 10 of: http://cds.linear.com/docs/Datasheet/6930fb.pdf JF
From: John Larkin on 15 Mar 2010 19:05 On Mon, 15 Mar 2010 15:06:33 -0500, John Fields <jfields(a)austininstruments.com> wrote: >On Mon, 15 Mar 2010 12:20:11 -0700, John Larkin ><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > >>On Sat, 13 Mar 2010 12:37:57 -0600, "krw(a)att.bizzzzzzzzzzzz" >><krw(a)att.bizzzzzzzzzzzz> wrote: >> >>>On Sat, 13 Mar 2010 09:05:24 -0800, John Larkin >>><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >>> >>>>On Sat, 13 Mar 2010 08:42:27 -0800, Fred Abse >>>><excretatauris(a)invalid.invalid> wrote: >>>> >>>>>On Fri, 12 Mar 2010 16:28:07 -0800, John Larkin wrote: >>>>> >>>>>> I never buy crystals for things like this. They have a high probability of >>>>>> not working, and you wind up fiddling with capacitors and such. It's >>>>>> easier to but a packaged, working crystal oscillator, already tuned to a >>>>>> couple PPM, guaranteed to oscillate, for $1.50 or thereabouts. >>>>> >>>>>Me, too. Amplifiers oscillate, oscillators don't ;-) >>>> >>>>We've just started using silicon oscillators, in SOT-23 sized >>>>packages, for things where 1% is good enough. We're using one part >>>>that's pin strappable for 8-4-2-1 MHz. >>> >>>A seven pin SOT-23? >> >>It's an LTC6930CMS8-8.00, in the MSOP8 package. It's basically an 8 >>MHz oscillator with three pins that can be strapped to divide by 1 >>through 128. > >--- >That's not quite true, since it can only divide by 1, 2, 4, 8, 16, 32, >64, or 128 depending on the settings of the DIV pins, as shown on page >10 of: > >http://cds.linear.com/docs/Datasheet/6930fb.pdf > >JF Don't be a PITA. John
From: krw on 15 Mar 2010 20:20
On Mon, 15 Mar 2010 12:20:11 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Sat, 13 Mar 2010 12:37:57 -0600, "krw(a)att.bizzzzzzzzzzzz" ><krw(a)att.bizzzzzzzzzzzz> wrote: > >>On Sat, 13 Mar 2010 09:05:24 -0800, John Larkin >><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >> >>>On Sat, 13 Mar 2010 08:42:27 -0800, Fred Abse >>><excretatauris(a)invalid.invalid> wrote: >>> >>>>On Fri, 12 Mar 2010 16:28:07 -0800, John Larkin wrote: >>>> >>>>> I never buy crystals for things like this. They have a high probability of >>>>> not working, and you wind up fiddling with capacitors and such. It's >>>>> easier to but a packaged, working crystal oscillator, already tuned to a >>>>> couple PPM, guaranteed to oscillate, for $1.50 or thereabouts. >>>> >>>>Me, too. Amplifiers oscillate, oscillators don't ;-) >>> >>>We've just started using silicon oscillators, in SOT-23 sized >>>packages, for things where 1% is good enough. We're using one part >>>that's pin strappable for 8-4-2-1 MHz. >> >>A seven pin SOT-23? > >It's an LTC6930CMS8-8.00, in the MSOP8 package. It's basically an 8 >MHz oscillator with three pins that can be strapped to divide by 1 >through 128. That's a DFN, not SOT-23. D/QFNs suck, though sadly there isn't often much choice. Since it's only a binary selection it's not all that much use, either. >Frequency is +-0.09% at room temp, plenty good for UARTS >and most timing apps. Wrong frequency for a baud-rate-generator. If you have to add logic for the baud-rate-generator, the binary divider chain doesn't help much. |