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Old 9th November 2012, 07:27 AM   #731
ccliu is offline ccliu  Taiwan
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I also received my boards yesterday. Thanks!!
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Old 9th November 2012, 11:35 AM   #732
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Domenico, I would like to modify your board by disconnecting the two clocks, and connect an external pair of clocks - 45.1584 and 49.152 MHz.

Is this OK? I presume your board needs to reference the master clock output, so will a higher clock speed be acceptable?
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Old 9th November 2012, 12:19 PM   #733
syklab is offline syklab  Hong Kong
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I received the board today.

Thanks
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Old 9th November 2012, 12:34 PM   #734
qusp is offline qusp  Australia
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Quote:
Originally Posted by linuxfan View Post
Domenico, I would like to modify your board by disconnecting the two clocks, and connect an external pair of clocks - 45.1584 and 49.152 MHz.

Is this OK? I presume your board needs to reference the master clock output, so will a higher clock speed be acceptable?
you expect you will get better performance using external clocks on a board that has no facility to use them? it needs to do more than reference to them, the output runs on them and the external clocks will need to respond to enable and shutdown commands. without terminated clock inputs you will make a mess, clock signals are not the same as audio signals.

i'll give you 50 bucks if you can show me a measured improvement by using external clocks on this board

they are actually not bad clocks either really.

if you planned to run an ESS dac with OSF enabled at 32/192+ in sync mode with this unit, I think youre out of luck. if its the speed that matters more than the low jitter, then perhaps you could add some x2 reclock flip flop to reclock the output? I really dont think external clocks, no matter how low jitter they are are going to give a better result.

you will also need to align the i2s signals with the new clock

Last edited by qusp; 9th November 2012 at 01:02 PM. Reason: changed wording, didnt mean it that harsh
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Old 9th November 2012, 02:36 PM   #735
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Could you add me to the GB for 1 kit?
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Old 9th November 2012, 08:07 PM   #736
mjock3 is offline mjock3  United States
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Received my board today! Thanks!
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Old 9th November 2012, 10:36 PM   #737
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Quote:
Originally Posted by qusp View Post
if its the speed that matters more than the low jitter
Yes, giving an ESS DAC a faster clock was the idea.

When I say "external", I just mean two new clocks on a small board mounted right beside the original clocks (but with the original clocks removed). This is simply "increased real estate" which will also include a dedicated regulator.

But all original connections to the XILINX CPLD would be maintained:
- enable pins from the two new clocks to pins 1 and 41 of the XILINX.
- clock outputs to pins 43 and 44 of the XILINX .....
Quote:
Originally Posted by qusp View Post
without terminated clock inputs you will make a mess
... via the original resistors.

Quote:
Originally Posted by qusp View Post
you will also need to align the i2s signals with the new clock
That's what I'm asking Domenico.
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Old 10th November 2012, 12:25 AM   #738
kevinkr is offline kevinkr  United States
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My board arrived safely a couple of days ago, picked up at the post office yesterday morning. Very nice looking board, planning to build a new dac around this.
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Old 10th November 2012, 02:23 AM   #739
qusp is offline qusp  Australia
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resistors smesistors.... terminated lines by themselves do not make.

OK lets see what he says, but my offer is still open.

the question was already asked and answered long ago btw

Quote:
Originally Posted by linuxfan View Post
Yes, giving an ESS DAC a faster clock was the idea.

When I say "external", I just mean two new clocks on a small board mounted right beside the original clocks (but with the original clocks removed). This is simply "increased real estate" which will also include a dedicated regulator.

But all original connections to the XILINX CPLD would be maintained:
- enable pins from the two new clocks to pins 1 and 41 of the XILINX.
- clock outputs to pins 43 and 44 of the XILINX .....

... via the original resistors.


That's what I'm asking Domenico.
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Old 10th November 2012, 02:40 PM   #740
niekos is offline niekos  Netherlands
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I added my name to the google doc that was used for GB2 (i presume: https://docs.google.com/spreadsheet/...wYS1EcXc#gid=0), as it was suggested by Domenico Vellante (Amanero Technologies) by e-mail.
Hopefully many will follow so this GB3 (min 60 pcs) will be filled soon

Last edited by niekos; 10th November 2012 at 02:47 PM.
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