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View Full Version : I2S LVDS on wanboard ?



m.rbizarre@mailoo.org
2014-02-14, 08:40
Hello,
Some DAC manufacturer or diy seller use I2S input in their dac via LVDS
transmitter/receiver. For example audio-gd use them in their high end
dac with RJ45 cable and twisted pair audio sell a similar module call
Teleporter. Psaudio have also propose free standard over hdmi cable
(since some diy board exist with this standard) :
http://www.diyaudio.com/forums/digital-line-level/164366-i2s-standards-ps-audio-2.html

As this king of connexion seems more audiophile than spdif/tosling or
usb and also very easy to integrate to existing dac, could it be
possible to make it work on the wandboard and Community Squeeze
Operating System ? I red in previous post that a member of the
community, JackOfAll, develop an i2s driver, could it work with this
standard ?

Thank you

JohnSwenson
2014-02-14, 12:30
Hello,
Some DAC manufacturer or diy seller use I2S input in their dac via LVDS
transmitter/receiver. For example audio-gd use them in their high end
dac with RJ45 cable and twisted pair audio sell a similar module call
Teleporter. Psaudio have also propose free standard over hdmi cable
(since some diy board exist with this standard) :
http://www.diyaudio.com/forums/digital-line-level/164366-i2s-standards-ps-audio-2.html

As this king of connexion seems more audiophile than spdif/tosling or
usb and also very easy to integrate to existing dac, could it be
possible to make it work on the wandboard and Community Squeeze
Operating System ? I red in previous post that a member of the
community, JackOfAll, develop an i2s driver, could it work with this
standard ?

Thank you

The I2S coming out of the Wandboard is not LVDS, it is standard CMOS level. An adapter would have to be built to take the I2S signals and run them through LVDS transmitters.

Whether it is better than another transport mechanism depends entirely on the DAC implementation. A really good asynchronous USB will beat the LVDS I2S.

There is an interesting possibility with the CSP hardware, it has an I2S output and clock input that will work directly with the driver for the CSP hardware, no software change required. You could build a DAC that has an ultra low jitter local clock, feed the clock to CSP, take the I2S out to the DAC and reclock with the local clock in the DAC. You can use LVDS or standard CMOS for the interface depending on how far the DAC is from the CSP. If you put both in the same box so the boards are a couple inches apart you probably don't need LVDS. If they are in separate boxes a foot or so apart then LVDS is a good choice.

John S.