TCXO for atmega 8, 168 or 328

F5JTZ · Joined: 24 Jun 2011 Posts: 13

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 )

sidknox · Posted: Thu Oct 23, 2014 1:51 am Post subject: TCXO

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

F5JTZ · Joined: 24 Jun 2011 Posts: 13

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 ?

O-Family · Joined: 23 May 2010 Posts: 320 Location: Japan

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

F5JTZ · Joined: 24 Jun 2011 Posts: 13

Hello
Thanks for this information very precise

Pat / France