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Old 5th February 2005, 04:21 PM   #1
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Default overclocking SAA7220 ?

Hi,

what will happen when I replace the crystal with one that has double or triple frequency ?
Cook the chip ?
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Old 5th February 2005, 04:39 PM   #2
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33.8688 MHz crystal in a Marantz CD273:

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Old 5th February 2005, 06:31 PM   #3
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Why does it work ?
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Old 6th February 2005, 10:35 AM   #4
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Unhappy Nobody ?

I moved the 33MHz crystal into a CD960 and measured - no change.

Maybe a 66MHz crystal will also work.
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Old 7th February 2005, 01:04 AM   #5
JohnW is offline JohnW  Hong Kong
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Bernhard,

When you used the 33MHz crystal, did you measure the frequency? – I suspect that it is a 3rd overtone type – and in fact oscillates at somewhere near 11.2896 when connected to the 7220 XO circuit. I understand that the SAA7220 gets very hot at the best of times, and I cannot image it operating at 33.8688MHz! – not to mention serial clock speeds between other devices.

I would really not recommence operating the 7220 any faster than its rated Max Clock speed - most seem to have a great problem operating at 11MHz - and are very sensative to operating voltage - I remember once seeing a batch of Marantz CD players (CD65 I believe) that had to modify the VCC rail to allow the SAA7220 to operate...

John
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