USB to I2S 384Khz - DSD Converter

[syklab]

Originally Posted by s3tup

Use the RS-485 or LVDS transmitter/receiver ICs...

Is the ADN4665/4666 is right kind?

[smanz]

Originally Posted by crobbins5421

I use the TDA1541A chip in my DAC. It uses 5V logic.

To use the Amanero board, I need a 3.3V to 5V level shifter like this:

So...I just run the I2S sigal grounds to the power ground on the level shifter?

Also, shouldn't the signal wires be the same length as the ground wires?...

I think a better solution is to use a digital isolator as the IL 175. Thus also break ground loops. You just have to connect VD1 to 3.3V (Amanero side) and VD2 to 5V (TDA1541 side)

All wires must be the same length.

Regards

[Hercules]

Originally Posted by merlin el mago

Sorry confused me.

Exactly!

[s3tup]

Originally Posted by syklab

Is the ADN4665/4666 is right kind?

ADN4667/ADN4668 seem to give much better layout, 1.5ps RMS jitter contribution by ADN4667/ADN4668 combo thru HDMI cable.

HDMI cables work nicely for I2S transmission.

[Odysseas]

I'm late I know, is the gb still on?

[smanz]

Originally Posted by syklab

Is the ADN4665/4666 is right kind?

Do you know this module? Teleporter Digital Transfer Module

Regards

[syklab]

Originally Posted by s3tup

ADN4667/ADN4668 seem to give much better layout, 1.5ps RMS jitter contribution by ADN4667/ADN4668 combo thru HDMI cable.

HDMI cables work nicely for I2S transmission.

Agree, will try to get a set of these chip to try out.

Thanks

[syklab]

Originally Posted by smanz

Do you know this module? Teleporter Digital Transfer Module

Regards

Didn't notice, worth a look and can save some work.

Thanks

[syklab]

Originally Posted by s3tup

ADN4667/ADN4668 seem to give much better layout, 1.5ps RMS jitter contribution by ADN4667/ADN4668 combo thru HDMI cable.

HDMI cables work nicely for I2S transmission.

According to the spec twisted pairs cable can be used as a transmission medium.

[qusp]

Originally Posted by smanz

I think a better solution is to use a digital isolator as the IL 175. Thus also break ground loops. You just have to connect VD1 to 3.3V (Amanero side) and VD2 to 5V (TDA1541 side)

All wires must be the same length.

Regards

yes they should ideally, if its all being reclocked a bit of difference wont cause a big problem. I didnt mention it on the previous page as it seemed like I already had my work cut out getting a ground for each signal =) plus it sounded like there was a long cable afterwards, so 20mm probably wasnt a big deal in the greater scheme of things. ribbon cable is a good way to assure the same length though so I just suggested that.


more general stuff for the thread

when twisted pear suggest twisted pair can be used, they mean actual twisted pair cable, not home twisted silver wire, but 100ohms ethernet cabling, I favor Belden Cu in PTFE network cable, but yes HDMI is a better cable construction IMO.

I tell you what though, nothing beats not needing to drive a long cable to your dac in the first place.... just use an isolator and reclock locally at the dac if you can. people really shouldnt be treating this like a separate peripheral, its part of the dac, it should be as close to the dac as possible, you should not use one of these HDMI or teleporter things just to enable you to install it somewhere you have enough room for your shunt regs... the thing is tiny, you should have room for it in any dac, putting it in another case just so you can use a low noise power supply is walking *** backwards