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Old 24th May 2011, 11:01 AM   #1
3nity is offline 3nity  Austria
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Default AES/EBU and Wolfson WM8804

Hi,

Did anyone try to connect an AES/EBU source to the Wolfson WM8804 receiver chip?
What is the correct implementation for this input?

Thank you.
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Old 26th May 2011, 03:16 AM   #2
singa is offline singa  Singapore
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For single ended input you need 110 ohm resistors to ground or a digital pulse transformer in single ended or balanced configuration.
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Old 3rd June 2011, 06:24 AM   #3
3nity is offline 3nity  Austria
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Thanks for your reply.
Maybe I was unclear:
Provided a balanced AES/EBU source, may I connect an AES-3 high level signal, range 2 to 7 Vpp, (through a 1:1 pulse transformer) to the WM8804.
Datasheet on page 11 only states:
Quote:
Supports AES-3 data frames
, no mention on level compatibility.

Or:
would it be better to use a 1.21:1 pulse trafo followed by an 8:1 (-18dB) passive attenuator, to derive 0.5/0.6Vpp to feed 8804 s/pdif input?
Please refer to fig. 1 of this application note:
Interfacing AES3 & S/PDIF
(The WM8804 supply will be 3.3V for both digital and pll sections -DVDD and PVDD-).

Any comment/suggestion?
Thank you in advance.
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Old 8th June 2011, 07:20 AM   #4
3nity is offline 3nity  Austria
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anyone?
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Old 11th June 2011, 02:19 PM   #5
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From what I can see in the datasheet you are limited to the PS voltage or slightly lower. A properly terminated AES 3 signal will be attenuated 6db (3.5V max) but that is still too high if the source is full rated signal level. A 1.21 stepdown pulse trafo would be your best bet and you shouldn't need any more attenuation.

Best, Bill
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Old 13th June 2011, 05:12 PM   #6
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I have heard about people using HiFace with DACs equiped with WM880x. Hiface has output level well beyond SPDIF specification, maybe even beyond AES PRO. I wouldn't use Wolfson for AES/EBU, better solution seems to be CS8416 with some ASRC...
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