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Old 13th January 2013, 05:09 PM   #71
smanz is offline smanz  Spain
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Thanks qusp.

I've always thought that it was imperative that the clock had to be exact multiples of the sampling frequency.

From your answer I understand that it is not necessary, and can be used exact 100Mhz clock to ReClock the signal.

Once again, thank you.
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Old 13th January 2013, 07:15 PM   #72
enantra is offline enantra  Spain
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Old 13th January 2013, 08:00 PM   #73
qusp is offline qusp  Australia
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Quote:
Originally Posted by smanz View Post
Thanks qusp.

I've always thought that it was imperative that the clock had to be exact multiples of the sampling frequency.

From your answer I understand that it is not necessary, and can be used exact 100Mhz clock to ReClock the signal.

Once again, thank you.
no problems, it normally would need multiples, but not with ESS as I understand it, because it is already going to take in all 3 i2s lines and use its own clock to decide where the samples go in relation to it. those 3 lines will be multiples of each other, or as close as the 100MHz clock will allow, but thats the same as just feeding it to the dac would be anyway, it would still have to take those samples in at the rate its 100MHz clock can accept them. you with me?

the ESS is always an async dac, even in sync mode, it just so happens that in sync mode it doesnt have to do any meaningful correction because the samples already have a pretty direct relationship to the clock speed.

no other dacs are like this
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Old 13th January 2013, 10:09 PM   #74
mvaldes is offline mvaldes  Italy
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Old 14th January 2013, 03:14 AM   #75
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Quick q about the isolator - adum3440 or iso7240m or ?

cheers
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Old 14th January 2013, 03:31 AM   #76
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Old 14th January 2013, 04:25 AM   #77
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Old 14th January 2013, 05:01 AM   #78
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Old 14th January 2013, 05:03 AM   #79
qusp is offline qusp  Australia
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Quote:
Originally Posted by KlipschKid View Post
Quick q about the isolator - adum3440 or iso7240m or ?

cheers
whatever you like. actually neither of them has anything on IL715/IL716/IL717
or Si8440BB/Si8441BB/Si8442BB; but only the IL are in the same package
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Old 14th January 2013, 05:30 AM   #80
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This size :

Click the image to open in full size.

so this :
IL715E - NVE - IC, DIGITAL ISOLATOR, 12NS, SOIC | e絡盟 Hong Kong
or this
ISO7240MDW - TEXAS INSTRUMENTS - IC, ISOLATOR 150MBPS | e絡盟 Hong Kong
or this
ADUM3440CRWZ - ANALOG DEVICES - IC, DIGITAL ISOLATOR, 32NS, SOIC | e絡盟 Hong Kong

Anyone tried all three ? Given they do the job, then prop'n delay seems to be key, so the Il seems to be the best part that fits.

Thanks Q.

Last edited by KlipschKid; 14th January 2013 at 05:37 AM.
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