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Buffer the I2S signals on DAC
Buffer the I2S signals on DAC
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Old 28th February 2019, 01:34 PM   #1
sismik11 is offline sismik11  Denmark
diyAudio Member
Join Date: Jul 2010
Default Buffer the I2S signals on DAC

I'm planning to do a hack on my MiniDSP DDRC-24 to get SPDIF output. I will follow this guide: MiniDSP DDRC-24: MiniDSP DDRC-24: Modified To Output SPDIF - Album on Imgur in which the I2S data is taken from the input of the DAC chip on the DDRC-24 and send to a I2S to SPDIF converter. In the guide one I2S to SPDIF converter is used to provide SPDIF for channels 1 and 2. I would like to add another converter to also get SPDIF out for channels 3 and 4.

My question is: Is some sort of buffer needed to buffer the I2S signals when using 2 boards? And how would one go about doing that?
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Old 18th September 2021, 09:55 AM   #2
mhelin is offline mhelin
diyAudio Member
Join Date: Apr 2003
Location: Tampere Finland Europe
Which DAC's are used on DDRC-24, are they so bad? They are from AKM but which model? AK4616VQ codec maybe?
E: It seems to be using AK4626A codec (AK4626AVQ) with a 102dB SNR A/D and 106dB SNR DACs (obsolete part by now)

Could use also HDMI connectors and cabling though there aren't any standards for pin usage. It's quite a common practice though.
There are also some ready made modules you can find from Ebay for an example:

Receiver & transmitter: HDMI-compatible I2S Receiver IIS - HDMI Transmit Board Signal Conversion Decoder | eBay

Transmitter only: I2S to HDMI Module IIS I2S HDMI | eBay

Last edited by mhelin; 18th September 2021 at 10:16 AM.
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