Balanced AES/EBU (SPDIF) input circuit (to DIR9001)

[novec]

I'm building a DAC with a DIR9001 receiver, which will be fed balanced AES/EBU from a Lynx AES16 sound card. Problem is, I haven't been able to find a balanced input circuit anywhere. And believe me, I've searched...

Anyone have a balanced input circuit? No transformers, it's already transformer coupled at the sound card.

[Bill Fuss]

Look at the CS8416 datasheet.

[stokessd]

Page 49 of the CS8416 data sheet has what I've seen for the last 20 years, but I only ever have used Crystal receiver chips.

http://www.cirrus.com/en/pubs/proDat.../CS8416_F3.pdf


Sheldon

[novec]

Thanks a lot, but I'm afraid it doesn't help me much with the DIR9001, as it only has single ended input. I guess it's possible to do an AES -> S/P-DIF conversion first, and then do a single ended input circuit, but I'm sorta hoping there's a better way...

[rfbrw]

The two of the usual suspects for this job are the 26LS32 and the SN75176.

[stormsonic]

@novec
If output od your soundcard is transformer coupled, signal on secondary is already balanced
Better to think about right transformer, how to make correct impedance, signall attenuation, right connector and reflections from DIR9001 input.
Schmitt trigers are nasty

Nice reading here:
LINK 1
LINK 2

[Algar_emi]

AES/EBU balnaced input to Bal/single ended is done with a digital transformer, and is easy to find everywhere. Check Twisted Pear Audio, their SPDIF 4:1 Mux. The schematic shows a good way to implement it.

[ghg]

Not that cheap ( ca. $ 50,- ), but perfect:

Neutrik - Audio - AES/EBU Impedance Transformer

[Bill Fuss]

Originally Posted by novec

Thanks a lot, but I'm afraid it doesn't help me much with the DIR9001, as it only has single ended input. I guess it's possible to do an AES -> S/P-DIF conversion first, and then do a single ended input circuit, but I'm sorta hoping there's a better way...

AES/EBU and SPDIF are virtually the same thing. Use a proper pulse traf and terminate it correctly, and ground one side of the secondary to digital ground, there is no other way AFAIK, except to ground one conductor through a cap.

[rfbrw]

Originally Posted by Bill Fuss

AES/EBU and SPDIF are virtually the same.

Aside from the different flags and the vastly different voltage levels. At least one of my dacs won't work properly with pro flags and a lot of AES/EBU inputs will not respond to the puny SPDIF levels.