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Old 24th November 2007, 01:15 PM   #1
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Default A clock unit I came accross

Here is what I came accross in a local store for obsolete and used electronic parts.
I really could not find any data for this obviously old Japanesse clock unit that seems to me a promising one.
Please, help me with some data if any available.
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Old 25th November 2007, 01:06 PM   #2
oshifis is offline oshifis  Hungary
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Why do you think this DIL crystal oscillator is anything special? It is as common as any other DIL encapsulated oscillator. If you are looking for some better (better = low phase noise), get a TCXO or even better an OCXO. They are usually big, 2.5 x 2.5 to 5 x 5 cm size. I bougt a Motorola TCXO an replaced the crystal in it, it was an easy job, because the metal can was fixed with screws. Narva also produces TCXOs and a lot of others, as well.
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Old 25th November 2007, 01:22 PM   #3
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Quote:
Originally posted by oshifis
Why do you think this DIL crystal oscillator is anything special? It is as common as any other DIL encapsulated oscillator. If you are looking for some better (better = low phase noise), get a TCXO or even better an OCXO. They are usually big, 2.5 x 2.5 to 5 x 5 cm size. I bougt a Motorola TCXO an replaced the crystal in it, it was an easy job, because the metal can was fixed with screws. Narva also produces TCXOs and a lot of others, as well.
Please, is it possible to decode the abbreviations TCXO and OCXO.
I really do not have any idea how good in phase jitter is the device I've got. I assume it would not be as bad as regular cristals because it has built in generator together with the cristal in one package and communicates with the external world with power, GND and clock out pins. At least I guess the jitter performance is limited and guaranteed, but I could not find any data about it...
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Old 25th November 2007, 01:23 PM   #4
poynton is offline poynton  United Kingdom
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Could be used in some CDP's as is or with a divide by 2 or 4 circuit in most others.

If they are cheap enough, buy them up and either sell on Ebay or on the forum market place.


Andy
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Old 25th November 2007, 02:04 PM   #5
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Quote:
Originally posted by beauty_divine

I really do not have any idea how good in phase jitter is the device I've got.

And neither has anyone else with the possible exception of Guido Tent. Without some serious measurement equipment there is no way to tell. Temperature compensated XOs offer no benefits for audio.
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Old 26th November 2007, 07:23 AM   #6
oshifis is offline oshifis  Hungary
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TCXO = Temperature Compensated Crystal Oscillator
OCXO = Oven Controlled Crystal Oscillator

The temperature stability has no benefit for audio indeed. But these devices are usually built for radio communications equipment where the phase noise is critical. The small DIL (Dual In-Line) encapsulated modules are used in PC cards, digital measuring instruments and elsewhere where small size is important. Generally there is a simple Pierce oscillator inside, built around a TTL inverter 74HCU04 or a programmable divider, which is not bad, but nothing special. The crystal gets full 5V swing which is not good for low phase noise. The "big" TCXOs have one or more transistor inside, and the voltage on the crystal can be kept below a few hundred millivolts. And a single transistor is generally lower noise than a TTL gate. There are exceptions of course... Look for something designed for industrial use (broadcast, etc) on this page:

http://global.kyocera.com/prdct/elec...ming/hpxo.html
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