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I2S isolation for DAC
I2S isolation for DAC
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Old 4th August 2019, 12:04 PM   #21
merlin el mago is offline merlin el mago  Europe
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Quote:
Originally Posted by analog_sa View Post
Yes. That is why the JLSounds use 45/49Mhz clocks.
I supposed, thanks.
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Old 4th August 2019, 05:09 PM   #22
JensH is offline JensH  Denmark
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I2S isolation for DAC
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Originally Posted by Colakurt View Post
I have considered the transformer solution too, but wouldnt that result in a phasshift/time delay between the MCLK and the other i2s signals? or does that not matter for an application like this?
A phase shift between MCLK and the I2S signals doesn't matter.

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Originally Posted by analog_sa View Post
A transformer for MCK? Never heard of this idea. What would happen to the square wave? Would it not be worse than jitter?
If a suitable wideband trnsformer is used, the jitter can be very low. Much lower than with digital isolators.
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Old 4th August 2019, 06:01 PM   #23
analog_sa is offline analog_sa  Europe
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I2S isolation for DAC
I would not anticipate jitter but rather a waveform with sloping edges. No idea what effect this would have. Can you suggest specs for a transformer or even a specific part?
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Old 4th August 2019, 06:09 PM   #24
JensH is offline JensH  Denmark
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I2S isolation for DAC
It is used in Frex's OSVA, see OSVA - Open source Versatile Analyzer

It was suggested here: SAR ADC for high performance audio ADC project [LTC2380-24]
Frex had already considered it, see a couple of posts later.

Some measurement results can be found here: SAR ADC for high performance audio ADC project [LTC2380-24]
The Würth 749010310 (LAN) seems to work very well. I am sure there are a lot of other possibilities.
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Old 4th August 2019, 07:10 PM   #25
analog_sa is offline analog_sa  Europe
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I2S isolation for DAC
Thank you!
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