[USRP-users] N200 Factory Clock

Nick Foster nick at ettus.com
Wed Jun 27 10:40:27 EDT 2012


On Wed, Jun 27, 2012 at 7:32 AM, Nowlan, Sean
<Sean.Nowlan at gtri.gatech.edu>wrote:

>  Hi all,****
>
> ** **
>
> I’m interested in studying the performance of the 10 MHz factory clock on
> the N200. It appears to be a F924B, which I **think** is manufactured by
> Fox Electronics and has the attached datasheet. If this is not correct,
> could someone point me to the actual datasheet?****
>
> ** **
>
> According to the attached datasheet, F924B should have Pin #1 as NC, but
> in both the N200 schematic and the board itself, there appears to be a
> resistor bias network and a capacitor on this pin. If I’m right about the
> manufacturer, the F924B is not a VCO… only the F924E is. If it’s just a
> TCXO, why is there an RC circuit? Thanks!
>

For compatibility with other TCXOs that may be installed and require a
pullup, a pulldown, or a divider for enable and frequency control. On the
FOX924B installed on the N210 those components are not required.

--n


> ****
>
> ** **
>
> Respectfully,****
>
> Sean Nowlan****
>
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>
>
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