buffer SPDIF input stage for ESS9018 - Page 3

RayCtech · 13th March 2012, 06:40 PM

Dropouts with SPDIF with ES9018 can (my opinion based on experience) be caused by register programming (not optional) of the ES9018,
or inadequate PSU / mains noise.

I do not have any problems at all even if I only use a digital pulse transformer directly connected to the ES9018 without any other components - except the 75 ohm termination resistor.

Your problem could be as simple as you are using SPDIF and have PCM word clock, PCM bit clock or PCM data connected and receiving ...

merlin el mago · 13th March 2012, 07:01 PM

Quote:

Originally Posted by RayCtech

Dropouts with SPDIF with ES9018 can (my opinion based on experience) be caused by register programming (not optional) of the ES9018,
or inadequate PSU / mains noise.Can be fixed the register programming? I think not inadequate PSU / mains noise: I use R-Core tx + Salas BiB regulator 5,25Vout 681mA, TP recommend 5,25V 490mA

I do not have any problems at all even if I only use a digital pulse transformer directly connected to the ES9018 without any other components - except the 75 ohm termination resistor.

Your problem could be as simple as you are using SPDIF and have PCM word clock, PCM bit clock or PCM data connected and receiving ... Could you elaborate and tell me how can solve/fix the isue?

Answered in red.

BII DIP switch settings are:

SW1
1,2,3 OFF
4 ON
5,6,7,8 OFF

SW2
1 ON
2,3,4,5,6,7 OFF
8 ON

RayCtech · 13th March 2012, 07:12 PM

Quote:

Originally Posted by merlin el mago

Could you elaborate and tell me how can solve/fix the isue?

BII DIP switch settings are:

SW1
1,2,3 OFF
4 ON
5,6,7,8 OFF

SW2
1 ON
2,3,4,5,6,7 OFF
8 ON

I have no BII competence in respect of switch settings or programming.
If you are running both SPDIF and PCM signals simultaneously to the ES9018 and that is the problem - there is maybe only two ways to cure this.
1. Disconnect the PCM signals when using SPDIF.
2. Change the programming for the ES9018 (I cannot help with this).
For option 2 you could contact the vendor of you DAC.

merlin el mago · 07:25 PM

Sorry is BIII. Do you want that I change IIR bandwith to DSD 50K, 60k or 70k?

merlin el mago · 13th March 2012, 08:01 PM

I increased the CCS current to 845mA to see what's happen.

stormsonic · 14th March 2012, 10:30 AM

@merlin
Go HERE and start reading. Or skip to the last page, where nice guy from Romania is willing to share pcb files.
And please use 74HCU04, where U = unbuffered.

merlin el mago · 14th March 2012, 11:59 AM

Thank you stormsonic, now I see is for AES/EBU balanced signal not for S/PDIF signal, also I take note to use U = unbuffered version.

stormsonic · 14th March 2012, 12:13 PM

...not for S/PDIF?

merlin el mago · 14th March 2012, 01:52 PM

Have I to use only half schematic for unbalanced S/PDIF signals right?

JensH · 14th March 2012, 04:10 PM

You could try to modify it as I suggested in post #15. The impedance is correct for SPDIF.
For AES/EBU you would need a higher impedance (110ohm).
As I wrote, the modification will give you twice as much signal. And that is at the buffer input, so it will make the buffer less sensitive to noise. The output will still be from 0 to the supply voltage (5V in this case).

13th March 2012, 07:17 PM	#24
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	Sorry is BIII. Do you want that I change IIR bandwith to DSD 50K, 60k or 70k? Last edited by merlin el mago; 13th March 2012 at 07:25 PM.

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13th March 2012, 06:40 PM	#21
RayCtech diyAudio Member Join Date: Sep 2007 Location: Multiple...	Dropouts with SPDIF with ES9018 can (my opinion based on experience) be caused by register programming (not optional) of the ES9018, or inadequate PSU / mains noise. I do not have any problems at all even if I only use a digital pulse transformer directly connected to the ES9018 without any other components - except the 75 ohm termination resistor. Your problem could be as simple as you are using SPDIF and have PCM word clock, PCM bit clock or PCM data connected and receiving ...

13th March 2012, 08:01 PM	#25
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	I increased the CCS current to 845mA to see what's happen.

14th March 2012, 10:30 AM	#26
stormsonic diyAudio Member Join Date: Aug 2008	@merlin Go HERE and start reading. Or skip to the last page, where nice guy from Romania is willing to share pcb files. And please use 74HCU04, where U = unbuffered.

14th March 2012, 11:59 AM	#27
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	Thank you stormsonic, now I see is for AES/EBU balanced signal not for S/PDIF signal, also I take note to use U = unbuffered version.

14th March 2012, 12:13 PM	#28
stormsonic diyAudio Member Join Date: Aug 2008	...not for S/PDIF?

14th March 2012, 01:52 PM	#29
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	Have I to use only half schematic for unbalanced S/PDIF signals right?

14th March 2012, 04:10 PM	#30
JensH diyAudio Member Join Date: Jul 2009	You could try to modify it as I suggested in post #15. The impedance is correct for SPDIF. For AES/EBU you would need a higher impedance (110ohm). As I wrote, the modification will give you twice as much signal. And that is at the buffer input, so it will make the buffer less sensitive to noise. The output will still be from 0 to the supply voltage (5V in this case).