192KHz crystal oscillator circuit

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V9977

Well-known member
Joined
Nov 22, 2004
Messages
170
Location
Athens, Greece
Hi,
Long time 'since I was here as a poster but I've been lurking at times still.

I have here a 192KHz crystal in a glass tube and 7-pin layout.
Like this: http://www.ebay.com/sch/i.html?_trksid=p2047675.m570.l1313.TR0.TRC0.Xnarva+crystal&_nkw=narva+crystal&_sacat=0&_from=R40

Iwant to make a square-wave clock o/p based on a 74HCT04 classic circuit. How can I optimise the values for such a size crystal (and low frequency).
Also, a divide by 2 and 4 circuit could allow 96 and 48KHz o/p.

Could it not be used as a master clock in digital converters with wc sync?
 
V9977 said:
Iwant to make a square-wave clock o/p based on a 74HCT04 classic circuit. How can I optimise the values for such a size crystal (and low frequency).

Frequency is not much of an issue, the rest of the crystal's parameters are (in particular series/shunt capacitance and maximum drive level). http://www.linear.com/docs/4108‎ may be a reasonable starting point (especially Figure 2).

How much mileage this will get you as a word clock I cannot say without having more context.

JDB.
[Generally you'd want your best converter to generate the word clock and slave other units off this. Discussed further in http://groupdiy.com/index.php?topic=22294 and http://groupdiy.com/index.php?topic=38565]
 
Rochey said:
you'll need the 192kHz x 64 or 128 to run a converter's master clock.

I'm talking Word clock on the BNC along with an AES/EBU connection. As far as I know this is a plain square wave at Fs, and it could be from anywhere hence: http://www.ebay.com/itm/Apogee-Big-Ben-Master-Clock-Clockgeneratoren-Synchronizer-/261257929356?pt=DE_Musikinstr_Signalprozessoren_Effekte&hash=item3cd42fa28c
No?!

@JDB thank you very much for this, I have some digital mastering units some of which require 2nd WC source to perform the processing etc. So sometimes there is no analog conversion involved, and a 'toolbox' clock is needed, not for quality or anything..  :)

Cheers for replies, anyone else with thoughts on the subject?
 

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