RE: Explain IIS interface

Digital Drive

Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it.

In Reply to: RE: Explain IIS interface posted by jedrider on March 5, 2021 at 07:24:55:

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

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Follow Ups Full Thread

Topic - Explain IIS interface - jedrider 09:56:38 03/04/21 (4)

RE: Explain IIS interface - Roseval 02:09:25 03/05/21 (3)

RE: Explain IIS interface - jedrider 07:24:55 03/05/21 (2)

RE: Explain IIS interface - flood2 22:27:11 03/14/21 (1)

RE: Explain IIS interface - jedrider 11:35:07 03/15/21 (0)

Follow Ups

RE: Explain IIS interface - flood2 22:27:11 03/14/21 (1)

RE: Explain IIS interface - jedrider 11:35:07 03/15/21 (0)

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