VS1053 with 12Mhz crystal

Designing hardware that uses VLSI Solution's devices as slave codecs such as an external MP3 decoder chip for a host microcontroller.
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escamoteur
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VS1053 with 12Mhz crystal

Post by escamoteur » Thu 2011-11-24 14:25

Hi,

Normally the VS1053 is driven by a 12.288 MHz. In the Datasheet it's said, that with the SC FREQ also other frenquencies can be used. So is there any problem if I use a 12Mhz crystal? Or does I get problems with audio quality?

I want to clock the VS1053 from my µC that runs with an 12Mhz clock.

Best
Tom

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pasi
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Re: VS1053 with 12Mhz crystal

Post by pasi » Thu 2011-11-24 14:42

With 12MHz crystal the max supported samplerate is 46875Hz, so 48000Hz songs play a bit slow.
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escamoteur
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Re: VS1053 with 12Mhz crystal

Post by escamoteur » Thu 2011-11-24 15:31

So if I would use a 16Mhz or 24Mhz, this would not be a problem? Isn't it important to have the exact frequency to get good audio?

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Thomas

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pasi
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Re: VS1053 with 12Mhz crystal

Post by pasi » Fri 2011-11-25 0:51

escamoteur wrote:So if I would use a 16Mhz or 24Mhz, this would not be a problem? Isn't it important to have the exact frequency to get good audio?
With our high-quality sample rate converter it is not important. (12.288MHz is 'exact' for 48kHz, 24kHz and 12kHz.) What is important is to have a jitter-free clock in the analog, which is why we use the crystal as analog clock, and PLL can multiply the clock for the digital parts.

XTALI is qualified for 12-13MHz, but I guess you could use 16MHz without a problem.

24kHz XTALI can be used, but you must activate the input clock divider making it 12MHz, thus have the problem with 48kHz again. But would not with 24.576MHz.
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escamoteur
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Re: VS1053 with 12Mhz crystal

Post by escamoteur » Fri 2011-11-25 9:29

Thanks a lot

Tom

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