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Old 27th January 2013, 08:20 AM   #281
DQ828 is offline DQ828  Australia
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Quote:
Originally Posted by acko View Post
... BOM and schematic sometime later in the week.
Given I'm electronics challenged, I'd very much appreciate you confirming the connections to the BIIISE if possible. This is what I was thinking, see below

Also I assume it needs a separate 3.3v supply (although it seems to have 2 * 3.3v inputs ) does anyone know the best way to do this can it be taken from the BIIISE?
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Last edited by DQ828; 27th January 2013 at 08:24 AM.
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Old 27th January 2013, 10:31 AM   #282
acko is offline acko  Australia
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Default BIIISE

If you are planning to use a BIII/BIIISE DAC with the AKL re-clocker, please note that there appears to be some sort of re-clocker already on board the BIII. Not sure what those chips are (or if they can be disabled/bypassed) but any benefit of the PotatoChips on the AKL unit is negated by the ones on the BIII. You may be better of taking the outputs from the isolator only and connect these to the BIII inputs.

Also, if you not using the on-board LDO of the AKL (not shown in the preview) then both the 3.3V inputs need to be connected to a suitable 3.3V external supply-just the way the PotChip package is.
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Old 27th January 2013, 11:15 PM   #283
acko is offline acko  Australia
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Default BIII support

... Awaiting more clarification.

TPA site indicate "Integrated Re-Clocker on board" and there are ICs (U4 .. U5) that look like Flip-flops. Other think they are not but for DSD/PCM switching.
Any clearer pic on U4-U5 area would help. Sorry, I do not have any Buffs myself, they wouldn't even sell me one!

Other than that the connections are correct. 'MCLK' from AKL doing another 're-clocking' on the BIII needs further investigtion.

No similar issues with BIIs or DACs without re-clockers built-in.

3.3V supplies can be taken from DAC DVCC but if you do not wish to disturb the DAC supplies then get a separate 3.3V source for the AKL board.

More App notes are on the way to help further ....
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Old 28th January 2013, 12:52 AM   #284
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This help? That is an MCP23018 16-bit I/O expander at left between dipswitches. That 220 thing? I don't see the U4 & 5 you are referring to? Different board revision? This is a 1.0.1. Nothing but jumpers/connectors on other side.

Click the image to open in full size.

Last edited by SCompRacer; 28th January 2013 at 01:10 AM.
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Old 28th January 2013, 02:50 AM   #285
acko is offline acko  Australia
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Default BIII support

Ok thanks, BIII for the version shown earlier is fine, just direct connections to the DAC. You will get the full benefits of the AKL re-clocker.

So it is BIIISE then, this must be their latest release. IC4-IC5 on this version looks like single D-FFs to me and there is a mention of "Integrated Re-Clocker"
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Old 28th January 2013, 02:55 AM   #286
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Yes, that pic is of a BIII board. I have two (dual mono). The other board is a version 1.0.2 but looks similar. A shot of the bottom of board. Right above "Thanks Brian" are the three holes under the clock. Snag the clock there?

Click the image to open in full size.

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Old 28th January 2013, 03:11 AM   #287
acko is offline acko  Australia
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Quote:
Originally Posted by SCompRacer View Post
......
Snag the clock there?
Yes, and use it to drive the RCK input of the Re-clocker board
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Old 28th January 2013, 03:14 AM   #288
acko is offline acko  Australia
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Quote:
Originally Posted by acko View Post
.....
So it is BIIISE then, this must be their latest release. IC4-IC5 on this version looks like single D-FFs .....
Possibly they are bus switches?
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Old 28th January 2013, 03:51 AM   #289
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Yes, and use it to drive the RCK input of the Re-clocker board
Thanks Acko. Looking at bottom of board do you think one could solder a U.Fl connector to the bottom or not enough contact for any strain on cable?

Also, with dual mono, should you connect to the master board clock? (I'm guessing yes but don't really know).

Last edited by SCompRacer; 28th January 2013 at 03:56 AM.
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Old 28th January 2013, 04:45 AM   #290
acko is offline acko  Australia
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Quote:
Originally Posted by SCompRacer View Post
Thanks Acko. Looking at bottom of board do you think one could solder a U.Fl connector to the bottom or not enough contact for any strain on cable?
You can try this to secure a U.FL connector this way. Alternatively, cut off one end of the u.fl cable assembly, strip a short length to get the leads and dovetail connection to the pin pads.

Quote:
Originally Posted by SCompRacer View Post
Also, with dual mono, should you connect to the master board clock? (I'm guessing yes but don't really know).
Yes, this should be fine. How are the signals connections to reclocker then?
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