I should say bypass. So it automatically bypass the ASRC and jitter eliminator in sync clock operation and the DPLL setting has no effect at all no matter what the setting is?
No - it does not bypass it. 🙂 It's just that the ASRC (via the DPLL) and the the input stream are now exactly in sync - meaning it is not really ASRC any more it is (no A for async any more) SRC 🙂 Yes - in this case the DPLL BW is not very important - so you might as well leave it wide open. In the ES9018 you actually had to do this is some cases - because of the lock speed issue in the old DPLL. As far as I have seen the new DPLL does not have this flaw.
Can you use a microcontroller to do the switching between SPDIF and Serial(PCM/DSD)? Just like the OttoII?
Alex
Yes - and that's exactly what the on-board controller/firmware does. 🙂 There is no external switching done at all. The DIP switch just lets the firware know which source you want it to select - you can use an external switch instead (via EXT_IO - keep the input select DIP switch open if you do that) or you can have your own controller do the same thing (just remeber to remove the on-board controller if you use your own external controller/firmware)
I think I am getting confused here, sorry. My understanding is that on the EXT_IO, if I gnd pin 5 (A0), I get SPDIF as my source or DSD if not grounded. Am I correct? I dont get it when you said "No External Switching done at all"? I thought you do this switching to select your source? SPDIF or DSD? Clarification please..
Alex
I mean that no signal goes through a switch 🙂
The only role of the switch is to tell the controller what to tell the DAC to select 🙂
The only role of the switch is to tell the controller what to tell the DAC to select 🙂
With the current stereo on-board firmware you have - Indeed! It is important to leave DIP switch SW1/Pos1 open (off) if you do that via an external switch.
Ok, I got it, so my question is, using the EXT_IO, instead of manually using a switch to ground A0, how do I do this using a controller? do I just connect A0 to the controller to switch high or low?
Alex
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Yep - just make sure you you drive it high you do so at 3.3V - not more. The safest approach is an open drain to type output that will only pull low (letting the weak pull-ups keep the net high when not pulled low by your controller)
Yes, thank you, my problem though is that I already have a controller but its high is 5v not 3.3v, maybe a simple voltage divider? from 5v to 3.3v?
Alex
The I2C port expander we use is 5.5V tolerant, so you should be fine using 5V, but not more than 5.5V.
Or use a logic level converter like this one: Bi-Directional Logic Level Converter Hookup Guide - learn.sparkfun.com
That would work, but should not be needed.
http://ww1.microchip.com/downloads/en/DeviceDoc/22103a.pdf
Also Mercury orders are open:
http://www.diyaudio.com/forums/twis...-achieving-escape-velocity-3.html#post5252094
http://www.diyaudio.com/forums/twis...-achieving-escape-velocity-3.html#post5252094