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Hi, researching DACs to buy. I seem to be desiring extra inputs. What is an IIS interface, why would I need one and what can I do with one? Thanks.
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The Well Tempered Computer
"Adding an I2S input was a way to future proof a DAC which could accept high DSD rates I think, but now USB interfaces caught up so it makes less sense."
That explains a lot. Thanks.
I2S is a standard serial bus protocol for two digital devices to communicate and is a more reliable way of transmitting data since
the clock is transmitted separately to the data. In contrast to this, S/PDIF is an inferior means of connecting a transport to a DAC because the "clock" is not directly transmitted but inferred from the timing interval for the preamble data attached to the data frame. Since the DAC has to recover the "clock" by sync'ing to the preamble sequence to recover the data, for early DACs, the DAC clock jitter was essentially determined by the weakest link which is the transmission line used (i.e cable or optical link). So if you have interference or noise on the transmission line, the clock is effectively contaminated.
SPDIF receivers improved over the years and strategies such as buffering and reclocking were employed to overcome the issues. Now, most well designed receiver circuits are essentially immune to the transmission line.
The reason you would want the I2S interface is because you had both a DAC AND transport that had the required I2S interface. Otherwise it will not be of much use to you on one component. Some components use an HDMI connector to transmit I2S which confuses users who try to hook into their receiver. A USB interface is only useful when you are connecting a PC to the DAC. I am not aware of any optical transport that uses the USB interface to a DAC.
Regards Anthony
"Beauty is Truth, Truth Beauty.." Keats
Yes, I read up on the II2 interface and it is actually a very simple design. I looks up on eBay and they sell 'mini-cards' that will convert II2 to either toslink or coaxial or both (usually coaxial overrides toslink).
So, that got me to thinking that I would like a little dongle that will give me an alternate toslink and coaxial and I notice that the mini-cards would need a 5v line, so I am wondering whether the D90 that I have puts a 5v on the HDMI connector?
Anyway, this is still moot because I would actually want a finished product of a dongle in a little case maybe with a short length of HDMI cable and at a reasonable price < $30.
All moot, so another DAC and an empty preamp input and another cable, but the idea was nice :-)
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