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TCXO for atmega 8, 168 or 328

 
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F5JTZ

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Joined: 24 Jun 2011
Posts: 13

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PostPosted: Wed Oct 22, 2014 9:52 am    Post subject: TCXO for atmega 8, 168 or 328 Reply with quote

Hello

someone should put in place unn TCXO 10, 16 or 20,000 Mhz instead of one quartz on Atmega 8, 168, or 328 or otherwise ?

If you have a schema for TCXO with output square wave or sinusoidal, thanks in advance.

Pat / France

(BASCOM-AVR version : 2.0.7.3 , Latest : 2.0.7.7 )
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sidknox

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Joined: 30 Apr 2006
Posts: 29
Location: NorthEast Oklahoma USA

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PostPosted: Thu Oct 23, 2014 1:51 am    Post subject: TCXO Reply with quote

Pat,
I am not sure what you are asking, but maybe this?
Here are many TCXO, some quite inexpensive.

http://www.ebay.com/sch/i.html?_odkw=crystal+oscillator&_ftrt=901&_sop=12&_sadis=15&_dmd=1&_osacat=0&_ipg=50&_ftrv=1&_from=R40&_trksid=p2045573.m570.l1313&_nkw=crystal+oscillator+TXCO+TCXO&_sacat=0

73, Sid W7QJQ

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F5JTZ

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Joined: 24 Jun 2011
Posts: 13

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PostPosted: Thu Oct 23, 2014 9:01 am    Post subject: Reply with quote

Hello

I research the wiring between a TCXO and an Atmega diagram.
Depending on whether the output of the TCXO is sinusoidal or square what adjustment needs to be done ?
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O-Family

Bascom Expert



Joined: 23 May 2010
Posts: 244
Location: Japan

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PostPosted: Thu Oct 23, 2014 10:26 am    Post subject: Reply with quote

Hi

The power supply voltage of AVR and a TCXO oscillator is the same, and if the output of TCXO is a square wave, the direct entry of it will be carried out to the [XTAL1] pin of AVR.

If the output of TCXO becomes in a clipped sine wave (DC cut), you must add an offset voltage to the clock.
In this case, the voltage of the sine wave is required 2Vp-p or more if 5V power supply voltage.

Frequency Counter 1
http://pub.idisk-just.com/fview/Lx0Fg4Aso3y4650JY6VZcfKvW3vbgygRZx7T5pHF9q78z63Qfh8SGWPr41Is9iUIPUNRxncg-sjTSFBSweYLEX076a-emQeMDBWZCAW7-t8.gif

Frequency Counter 3
http://www.ne.jp/asahi/shared/o-family/ElecRoom/AVRMCOM/AVRFrqCun3/FrqCun3Cir.pdf
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F5JTZ

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Joined: 24 Jun 2011
Posts: 13

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PostPosted: Thu Oct 23, 2014 11:39 am    Post subject: Reply with quote

Hello
Thanks for this information very precise

Pat / France
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