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I2S to SPDIF
I2S to SPDIF
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Old 20th August 2019, 10:18 PM   #1
skruerselv is offline skruerselv  Denmark
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Default I2S to SPDIF

Hi there.
Is it possible to make af coaxial spdif output on a Marantz MR 2021 (MR2020) ?
There is a dac chip (TDA1311AT) on the board and it seems like it receives a I2S signal ?
Can i use some I2S to coaxial board and connect it to the serial interface and get a digital output to my dac ? (TDA1311AT disconnected)

Or is there another way you think is better or easier

I have tried to use the analog line out to line in on my pre amp, but its way to high level, and making distortion, and i would really like to make a digital output on this Marantz MR 2021

If i can make an digital output with an I2S to coaxial spdif board and you have ideas to a (cheep) board, please let me know

I have to say that iam not a electronic nerd at all

The service manual to the Marantz MR 2021 is here and i picture of the TDA 1311AT connection

Marantz MR2020 Service Manual (Page 33 of 42)

Page 33

Click the image to open in full size.
__________________________________________________ ______

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Old 21st August 2019, 06:24 PM   #2
skruerselv is offline skruerselv  Denmark
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No one ?
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Old 21st August 2019, 10:10 PM   #3
newfinish is offline newfinish  Canada
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i saw there is a board for oppo to have a i2s in the back , does it replace one of the hdmi? dont know. heres a link OPPOMOD
i guess its doable for any player...
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Old 22nd August 2019, 03:38 PM   #4
JensH is offline JensH  Denmark
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I2S to SPDIF
It is fairly simple to convert from I2S to SPDIF. I have made some designs in the past using CS8406 and AK4118A for that purpose (only one of the IC's in a design).

There might be a challenge here, since there may not be a suitable MCLK available, which these IC's require. My latest design uses a PLL to generate that from the SCLK, so no ned for a separate MCLK. If an MCLK is available, it will simplify the design.

I don't know if off the shelf PCB's with the desired functionality are available.
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Old 22nd August 2019, 04:08 PM   #5
skruerselv is offline skruerselv  Denmark
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Quote:
Originally Posted by JensH View Post
It is fairly simple to convert from I2S to SPDIF. I have made some designs in the past using CS8406 and AK4118A for that purpose (only one of the IC's in a design).

There might be a challenge here, since there may not be a suitable MCLK available, which these IC's require. My latest design uses a PLL to generate that from the SCLK, so no ned for a separate MCLK. If an MCLK is available, it will simplify the design.

I don't know if off the shelf PCB's with the desired functionality are available.
PM sent
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Old 22nd August 2019, 09:28 PM   #6
rfbrw is offline rfbrw
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Alas, the OP has cut off the most relevant part of the schematic posted, the SPDIF output.
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Old 22nd August 2019, 09:32 PM   #7
skruerselv is offline skruerselv  Denmark
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Quote:
Originally Posted by rfbrw View Post
Alas, the OP has cut off the most relevant part of the schematic posted, the SPDIF output.
You can see it all here = Marantz MR2020 Service Manual (Page 33 of 42)
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Old 22nd August 2019, 10:02 PM   #8
rfbrw is offline rfbrw
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I don't need to see it. It is for you to try it.
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Old 22nd August 2019, 10:04 PM   #9
skruerselv is offline skruerselv  Denmark
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Quote:
Originally Posted by rfbrw View Post
I don't need to see it. It is for you to try it.
Sorry
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Old 23rd August 2019, 12:21 AM   #10
dacen is offline dacen  Norway
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If you take a look at the chip SAA7372 you will find the SPDIF output already available at pin 31. It is the EBU output. Goes to connector J205 D-OUT. Pin 31 is marked DOBM. It is a short for Digital Out Biphase Mark (that´s SPDIF).
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