XO - AKX302
Simple XO board for use with the re-clocker and DACs:
Has buffered and un-buffered outputs.
LDO options (AD150) for both XO and Buffer IC.
External power option.
0.8mm thick, FR4 board, 2oz Cu, gold plated
Price: USD 12 + std shipping (airmail)
Free shipping for those who have bought the Rec-clocker boards
A free board (and free shipping) for those who have also bought my DACs
Off to Fab early next week. ETA stock ~1wk.
Any comments/suggestions welcome.
Simple XO board for use with the re-clocker and DACs:
Has buffered and un-buffered outputs.
LDO options (AD150) for both XO and Buffer IC.
External power option.
0.8mm thick, FR4 board, 2oz Cu, gold plated
Price: USD 12 + std shipping (airmail)
Free shipping for those who have bought the Rec-clocker boards
A free board (and free shipping) for those who have also bought my DACs
Off to Fab early next week. ETA stock ~1wk.
Any comments/suggestions welcome.
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Thanks for the update. Hopefully the rest will also get their boards within the next couple of weeks. Let me know if this is not the case.
For new XO board there will be no GB as this is a standard product, so there will be ample in stock
Acko,
I've just got two questions:
1. I'm about to order my Potatosemi FF for the reclocker so I was wondering if I could use one of their buffer's too. Is the PO74G38072A compatible?
2. Out of interest, is there a technical reason for the 0805 impedance matching resistors on this board vs the 0603 resistors used on the AKL-S0x boards?
Chris
I've just got two questions:
1. I'm about to order my Potatosemi FF for the reclocker so I was wondering if I could use one of their buffer's too. Is the PO74G38072A compatible?
2. Out of interest, is there a technical reason for the 0805 impedance matching resistors on this board vs the 0603 resistors used on the AKL-S0x boards?
Chris
Yes, it is in fact another tasty PotatoChip PO74G38072A
Actually a 1206 on this board to make it easier for manual soldering and if you wish go for z-foils or RF types that more readily available in bigger packages. The Re-Clocker board is pretty cramped to match the Amanero dimensions and so the reason for 0603s
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Thanks Acko, I've ordered my PotatoChips
What are the chances of changing the ext header to a 3-term type? I have a few spare of Ian's TPS7A regulator boards here that I could use, others might want to try Hynes reg or TPA shunt reg. This might need you to flip the 5V XO Power input to the top edge of the board perhaps?
What are the chances of changing the ext header to a 3-term type? I have a few spare of Ian's TPS7A regulator boards here that I could use, others might want to try Hynes reg or TPA shunt reg. This might need you to flip the 5V XO Power input to the top edge of the board perhaps?
No worries, here is a pic of Ian's TPS7A4700 reg:
He designed it when chasing better performance from the Si570 and found it gave a reasonable improvement over the ADP151 LDO that he was using previously.
Schematic is here - http://www.diyaudio.com/forums/atta...-pdif-fifo-kit-group-buy-tps7a4700v2.5sch.pdf
He designed it when chasing better performance from the Si570 and found it gave a reasonable improvement over the ADP151 LDO that he was using previously.
Schematic is here - http://www.diyaudio.com/forums/atta...-pdif-fifo-kit-group-buy-tps7a4700v2.5sch.pdf
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I don't think Ian has published any dimensions. I don't have any callipers here, but by measuring one I have here against a ruler I get 20mm x 31mm. The 3pin socket appears to be dead centre and holes are at 0.1in (2.54mm) pitch.
Here is a post where Ian shows it mounted a few different ways with the Si570 - diyAudio
In terms of availability, it is really only available whenever Ian runs a GB, so I'm not sure if I would describe it as 'readily available' though I can't see Ian having a huge objection to someone replicating the PCB since it is relatively simple. A similar circuit could be made on board though the QFN package reg chip isn't as simple (though it certainly is possible) to solder with conventional soldering iron so might not be ideal as the 'default' but it does represent a significant step up in performance over the ADP150.
My thoughts were that since the 3 pin vin,gnd,vout connection format is also used for other regulators this would allow people to experiment in the same way as Ian suggests in the post I've linked above.
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XO = Crystal Oscillator
Possibly gets confusing for non-electrically minded audio enthusiasts since we have more than one meaning for XO.
As Acko says, this board is for mounting an additional oscillator to generate RCLK.
This stuff hurts my brain
The App notes show;
Sync Mode, Direct Connection, No Isolation, I assume means this the Amanero is re-clocking the DAC?
ASync Mode, Direct Connection, No Isolation, this I assume means the DAC is re-clocking the Amanero signal?
PSync Mode, Isolated Connection, this I assume means the separate XO is re-clocking the Amanero signal?
I assume I can set up my board so the Amanero is isolated from the BIIISE & the BIIISE is doing the re-clocking of the Amanero signal? I assume this would be called ASync, Isolated.
I assume a lot
The App notes show;
Sync Mode, Direct Connection, No Isolation, I assume means this the Amanero is re-clocking the DAC?
ASync Mode, Direct Connection, No Isolation, this I assume means the DAC is re-clocking the Amanero signal?
PSync Mode, Isolated Connection, this I assume means the separate XO is re-clocking the Amanero signal?
I assume I can set up my board so the Amanero is isolated from the BIIISE & the BIIISE is doing the re-clocking of the Amanero signal? I assume this would be called ASync, Isolated.
I assume a lot
This stuff hurts my brain
The App notes show;
Sync Mode, Direct Connection, No Isolation, I assume means this the Amanero is re-clocking the DAC?
ASync Mode, Direct Connection, No Isolation, this I assume means the DAC is re-clocking the Amanero signal?
PSync Mode, Isolated Connection, this I assume means the separate XO is re-clocking the Amanero signal?
I assume I can set up my board so the Amanero is isolated from the BIIISE & the BIIISE is doing the re-clocking of the Amanero signal? I assume this would be called ASync, Isolated.
I assume a lot
May look confusing but there is a method to this madness
Amanero MCLK clocks the DAC. Assuming of course the DAC module has no on-board XO or XO is disabled and MCLK feed is external
Default connection for ESS DACs. "Re-clocking" and processing is within the chip itself
Both DAC and Re-clocker tied to a single XO. AKL-AMN-SXX doing re-clocking and so is the DAC chip in somewhat synchronous manner (so the term 'psuedo' sync).
Depending on how your DAC, XO, Transport and Re-clocker is hooked up it will fall into one to the categories as listed in the App Notes. Which is the best setup or if there are any benefits of inserting the re-clocker is aim of this project.
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