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miracle: all solid state oszillator with 160 ps pk-pk jitter
miracle: all solid state oszillator with 160 ps pk-pk jitter
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Old 16th September 2004, 11:10 AM   #1
capslock is offline capslock  Europe
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Default miracle: all solid state oszillator with 160 ps pk-pk jitter

Maxim have issued an all solid state resonator, i.e. a couple of hundred transistors within, but no crystal or ceramic resonator. They don't reveal what gives them the stability.

http://www.spezial.de/doc/maxim/max7375.pdf

It is clear that they don't have much experience with jitter measurements and standards. They just measure pk-pk jitter with a scope, giving no indication how stable the scope's timebase is and how well the trigger circuit works.

However, 160 ps pk-pk at 8 MHz observed over 20 s is pretty impressive for a circuit without a crystal or resonator.
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Old 17th September 2004, 11:06 AM   #2
Guido Tent is offline Guido Tent  Netherlands
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Default Re: miracle: all solid state oszillator with 160 ps pk-pk jitter

Quote:
However, 160 ps pk-pk at 8 MHz observed over 20 s is pretty impressive for a circuit without a crystal or resonator. [/B]
Yes, but no good for audio. Obviously it is the marketing department driving this development, as they want to reduce the number of external components.

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Old 17th September 2004, 11:22 AM   #3
capslock is offline capslock  Europe
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Well, there is a whole bunch of audio clock generators and S/PDIF interface receivers that boast a whooping 70 to 200 ps RMS. Naively, I would convert that to 420 - 1200 ps pk-pk.

Those clock generators generate all the audio clocks from a 27 Mhz crystal via PLL. They live in all but the most expensive DVD, DVD/SACD and DVD-A players. Some of those players have been getting pretty good reviews for their audio performance.

Similarly, I am not aware of any receiver chip that is better than 70 ps RMS and some outboard DACs that are clocked from the receiver generated clock (rather than using a VCXO or being the master themselves, as it should be done) have also been getting good reviews.

So the advertised performance should be good enough for pretty good audio, even if it does not meet exactly your or my needs
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Old 17th September 2004, 01:49 PM   #4
Guido Tent is offline Guido Tent  Netherlands
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Quote:
Originally posted by capslock

So the advertised performance should be good enough for pretty good audio, even if it does not meet exactly your or my needs
we agree, and piece by piece performance decreases........

anyhow, it also brings opportunities

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