Re: [time-nuts] 32.768Khz Crystal/Resonator suggestions.
It all depends on how accurate the frequency has to be. If you only need 2%, I would use a C8051F300 microcontroller's built-in oscillator (24.5MHz +/-2%) and divide it down using the processor itself. The chip comes in a 11 pin QFN that is 3x3 mm, a little bigger than you need, but it does not require any external component. The frequency can be trimmed to better than 2% on many Silabs chips but I am not 100% sure that is the case on this one. On Fri, Nov 1, 2013 at 11:30 AM, Dan Kemppainen d...@irtelemetrics.comwrote: Hi all, I've got a project upcoming that will require a frequency of 32.768 Khz in a harsh environment (Imagine a thousand G's at 100Hz with 150 Deg C temperatures). Also, this thing needs to be small, 2mmx1.5x1.5mm or so. It also has to be low power. Frequency stability is probably less of a concern than just surviving (some frequency error vs. temp can be trimmed out with other smarts in the design. In the past, crystals just haven't liked surviving due to the construction. Have had good luck with ceramic resonators at higher frequencies (50Mhz and up). I've also looked at silicon oscillators, which will work in the application, however with the chip and associated resistors/caps they get a little bigger that what I was hoping for. Is anyone aware of a frequency source (crystal/resonator or other) in a small package that is robustly mounted? Or are there any ceramic resonators available that are in small packages in those low frequencies? I checked the big distributors, and did not have any luck. Dan ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 32.768Khz Crystal/Resonator suggestions.
I have actually used these chips at 125C and the factory even gave me extensive data supporting even higher temperature operation (for missile applications,m can't tell you more). Don't know about 150C though. That is pretty high. On Sat, Nov 2, 2013 at 8:36 AM, Didier Juges shali...@gmail.com wrote: It all depends on how accurate the frequency has to be. If you only need 2%, I would use a C8051F300 microcontroller's built-in oscillator (24.5MHz +/-2%) and divide it down using the processor itself. The chip comes in a 11 pin QFN that is 3x3 mm, a little bigger than you need, but it does not require any external component. The frequency can be trimmed to better than 2% on many Silabs chips but I am not 100% sure that is the case on this one. On Fri, Nov 1, 2013 at 11:30 AM, Dan Kemppainen d...@irtelemetrics.comwrote: Hi all, I've got a project upcoming that will require a frequency of 32.768 Khz in a harsh environment (Imagine a thousand G's at 100Hz with 150 Deg C temperatures). Also, this thing needs to be small, 2mmx1.5x1.5mm or so. It also has to be low power. Frequency stability is probably less of a concern than just surviving (some frequency error vs. temp can be trimmed out with other smarts in the design. In the past, crystals just haven't liked surviving due to the construction. Have had good luck with ceramic resonators at higher frequencies (50Mhz and up). I've also looked at silicon oscillators, which will work in the application, however with the chip and associated resistors/caps they get a little bigger that what I was hoping for. Is anyone aware of a frequency source (crystal/resonator or other) in a small package that is robustly mounted? Or are there any ceramic resonators available that are in small packages in those low frequencies? I checked the big distributors, and did not have any luck. Dan ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 32.768Khz Crystal/Resonator suggestions.
The C8051F300 also has a built-in temperature sensor and ADC, so you could probably implement temperature compensation without any additional component if needed. On Sat, Nov 2, 2013 at 8:37 AM, Didier Juges shali...@gmail.com wrote: I have actually used these chips at 125C and the factory even gave me extensive data supporting even higher temperature operation (for missile applications,m can't tell you more). Don't know about 150C though. That is pretty high. On Sat, Nov 2, 2013 at 8:36 AM, Didier Juges shali...@gmail.com wrote: It all depends on how accurate the frequency has to be. If you only need 2%, I would use a C8051F300 microcontroller's built-in oscillator (24.5MHz +/-2%) and divide it down using the processor itself. The chip comes in a 11 pin QFN that is 3x3 mm, a little bigger than you need, but it does not require any external component. The frequency can be trimmed to better than 2% on many Silabs chips but I am not 100% sure that is the case on this one. On Fri, Nov 1, 2013 at 11:30 AM, Dan Kemppainen d...@irtelemetrics.comwrote: Hi all, I've got a project upcoming that will require a frequency of 32.768 Khz in a harsh environment (Imagine a thousand G's at 100Hz with 150 Deg C temperatures). Also, this thing needs to be small, 2mmx1.5x1.5mm or so. It also has to be low power. Frequency stability is probably less of a concern than just surviving (some frequency error vs. temp can be trimmed out with other smarts in the design. In the past, crystals just haven't liked surviving due to the construction. Have had good luck with ceramic resonators at higher frequencies (50Mhz and up). I've also looked at silicon oscillators, which will work in the application, however with the chip and associated resistors/caps they get a little bigger that what I was hoping for. Is anyone aware of a frequency source (crystal/resonator or other) in a small package that is robustly mounted? Or are there any ceramic resonators available that are in small packages in those low frequencies? I checked the big distributors, and did not have any luck. Dan ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] 32.768Khz Crystal/Resonator suggestions.
Hi all, I've got a project upcoming that will require a frequency of 32.768 Khz in a harsh environment (Imagine a thousand G's at 100Hz with 150 Deg C temperatures). Also, this thing needs to be small, 2mmx1.5x1.5mm or so. It also has to be low power. Frequency stability is probably less of a concern than just surviving (some frequency error vs. temp can be trimmed out with other smarts in the design. In the past, crystals just haven't liked surviving due to the construction. Have had good luck with ceramic resonators at higher frequencies (50Mhz and up). I've also looked at silicon oscillators, which will work in the application, however with the chip and associated resistors/caps they get a little bigger that what I was hoping for. Is anyone aware of a frequency source (crystal/resonator or other) in a small package that is robustly mounted? Or are there any ceramic resonators available that are in small packages in those low frequencies? I checked the big distributors, and did not have any luck. Dan ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 32.768Khz Crystal/Resonator suggestions.
Hi Dan, I beg your pardon for being so curious, but where do you have to put electronics in a thousand G's at 100Hz? Thank you Volker Am 01.11.2013 17:30, schrieb Dan Kemppainen: Hi all, I've got a project upcoming that will require a frequency of 32.768 Khz in a harsh environment (Imagine a thousand G's at 100Hz with 150 Deg C temperatures). Also, this thing needs to be small, 2mmx1.5x1.5mm or so. It also has to be low power. Frequency stability is probably less of a concern than just surviving (some frequency error vs. temp can be trimmed out with other smarts in the design. In the past, crystals just haven't liked surviving due to the construction. Have had good luck with ceramic resonators at higher frequencies (50Mhz and up). I've also looked at silicon oscillators, which will work in the application, however with the chip and associated resistors/caps they get a little bigger that what I was hoping for. Is anyone aware of a frequency source (crystal/resonator or other) in a small package that is robustly mounted? Or are there any ceramic resonators available that are in small packages in those low frequencies? I checked the big distributors, and did not have any luck. Dan ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 32.768Khz Crystal/Resonator suggestions.
Kind of scratching my head on that also some blade? Regards Paul On Fri, Nov 1, 2013 at 5:50 PM, Volker Esper ail...@t-online.de wrote: Hi Dan, I beg your pardon for being so curious, but where do you have to put electronics in a thousand G's at 100Hz? Thank you Volker Am 01.11.2013 17:30, schrieb Dan Kemppainen: Hi all, I've got a project upcoming that will require a frequency of 32.768 Khz in a harsh environment (Imagine a thousand G's at 100Hz with 150 Deg C temperatures). Also, this thing needs to be small, 2mmx1.5x1.5mm or so. It also has to be low power. Frequency stability is probably less of a concern than just surviving (some frequency error vs. temp can be trimmed out with other smarts in the design. In the past, crystals just haven't liked surviving due to the construction. Have had good luck with ceramic resonators at higher frequencies (50Mhz and up). I've also looked at silicon oscillators, which will work in the application, however with the chip and associated resistors/caps they get a little bigger that what I was hoping for. Is anyone aware of a frequency source (crystal/resonator or other) in a small package that is robustly mounted? Or are there any ceramic resonators available that are in small packages in those low frequencies? I checked the big distributors, and did not have any luck. Dan ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 32.768Khz Crystal/Resonator suggestions.
Hi There are several possibilities, each of them pretty well tells you what industry is looking for the crystal. Bob On Nov 1, 2013, at 7:25 PM, paul swed paulsw...@gmail.com wrote: Kind of scratching my head on that also some blade? Regards Paul On Fri, Nov 1, 2013 at 5:50 PM, Volker Esper ail...@t-online.de wrote: Hi Dan, I beg your pardon for being so curious, but where do you have to put electronics in a thousand G's at 100Hz? Thank you Volker Am 01.11.2013 17:30, schrieb Dan Kemppainen: Hi all, I've got a project upcoming that will require a frequency of 32.768 Khz in a harsh environment (Imagine a thousand G's at 100Hz with 150 Deg C temperatures). Also, this thing needs to be small, 2mmx1.5x1.5mm or so. It also has to be low power. Frequency stability is probably less of a concern than just surviving (some frequency error vs. temp can be trimmed out with other smarts in the design. In the past, crystals just haven't liked surviving due to the construction. Have had good luck with ceramic resonators at higher frequencies (50Mhz and up). I've also looked at silicon oscillators, which will work in the application, however with the chip and associated resistors/caps they get a little bigger that what I was hoping for. Is anyone aware of a frequency source (crystal/resonator or other) in a small package that is robustly mounted? Or are there any ceramic resonators available that are in small packages in those low frequencies? I checked the big distributors, and did not have any luck. Dan ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
