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Old 24th November 2012, 11:44 AM   #601
qusp is offline qusp  Australia
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I forgot to mention, if you are using the isolator, the optional 3rd isolator chip is a 2 way device designed for isolating the i2c for example from the MCU. you can use it for anything you like of course, but it would be counterproductive to isolate everything then circumvent it with the MCU USB connection
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Old 24th November 2012, 01:02 PM   #602
qusp is offline qusp  Australia
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Quote:
Originally Posted by acko View Post
Thanks Qusp, points noted.
I have got the latest manuals and boards from Ian also. The Clock board is marked DoublerateDualClock with FW3.3. At first blush showing up to 352KHz only. Cannot seem to find the 384KHz rates. Not trying to be pedantic but I have plans to tap all these bits and direct them to an I2C comms chip on my upcoming SuperTrans module so that the Controller (AKC12) or Arduino can read them. As pointed out by GLT, in Sync mode the Sabre DAC gets disorientated trying to figure out sample rates by itself, so getting it direct from transport is the way to go.
youre right its only indicated with the 192khz light by itself, think thats an error, since you mentioned it I remember briefly testing 384 with amanero and not getting the right indication for 384. i've only had fifo with v3.3 FW back for a few weeks and its been ******* down for a lot of it, too humid for operating a dac like this with the top off, I had a disconcerting slight hissing sound (no smoke but enough to make me switch off immediately) when I turned it on last week... I know after that crazy horizontal rain we had, some of the light fittings were dripping while I was asleep, so I packed it away in a box all this week with some crystals and baking soda. theres nothing directly above where the dac was, but one not far away, could have got a touch of spray, nothing else could have been wrong as it had been fully operational the day before.
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Old 30th November 2012, 10:38 AM   #603
acko is offline acko  Australia
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Quote:
Originally Posted by qusp View Post
I forgot to mention, if you are using the isolator, the optional 3rd isolator chip is a 2 way device designed for isolating the i2c for example from the MCU. you can use it for anything you like of course, but it would be counterproductive to isolate everything then circumvent it with the MCU USB connection
The MCU (AKC12) USB serial comms is low speed LVTTL and can also be isolated similarly, e.g. using an IL716 chip for the TX/RX lines
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Old 30th November 2012, 02:53 PM   #604
qusp is offline qusp  Australia
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yeah thats what I was suggesting, the siliconlabs chips are not a bad option either, like Si8440BB/Si8441BB/Si8442BB. so the i2c, or the 'USB' can be isolated, either or wouldnt seem to make a lot of difference. I would think doing the i2c would again be preferred because its the last minute so any possible noise on ground from the MCU is avoided. not suggesting that is an issue, but why not if you can?
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Old 1st December 2012, 01:38 PM   #605
rade95 is offline rade95  United States
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Have you discussed AKD16 (ES9016), master clock options anywhere in this forum? I'd like to build a DAC around that board with Arduino (I2C) as a controller, so I am wondering what master clock options are available that are reasonably priced. Any ideas?
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Old 5th December 2012, 12:13 PM   #606
acko is offline acko  Australia
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Default Master Clock for AKD16

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Originally Posted by rade95 View Post
Have you discussed AKD16 (ES9016), master clock options anywhere in this forum? I'd like to build a DAC around that board with Arduino (I2C) as a controller, so I am wondering what master clock options are available that are reasonably priced. Any ideas?
Master clock can be from the transport MCLK output. This is usually available and will be very straightforward to connect directly, 3.3V logic (Synchronous mode and no extra cost). Alternatively, dedicated clock modules (e.g. Crystek CCHD series) can be used up to 100MHz for the 9016 DAC. More elaborate ones like the AKX701 provide even further options.
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Last edited by acko; 5th December 2012 at 12:17 PM.
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Old 6th December 2012, 02:22 AM   #607
rade95 is offline rade95  United States
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Quote:
Originally Posted by acko View Post
Master clock can be from the transport MCLK output. This is usually available and will be very straightforward to connect directly, 3.3V logic (Synchronous mode and no extra cost). Alternatively, dedicated clock modules (e.g. Crystek CCHD series) can be used up to 100MHz for the 9016 DAC. More elaborate ones like the AKX701 provide even further options.
Any S/PDIF boards available other then TPA, as they are out of stock?
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Old 12th December 2012, 07:09 PM   #608
acko is offline acko  Australia
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Default Sodif

You could use the AKS110. Parts are in stock. Please check website
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Old 14th December 2012, 06:53 AM   #609
acko is offline acko  Australia
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Default Turbo Re-Clocker AKL series ...

Folks,

This is another attempt to get the EX2UI board to work with the Turbo Clock (AKX701) unit. (In my previous post I highlighted some difficulties)

The EXA unit has a FIFO-buffer + dual clock on a compact board, all great for jitter elimination. However, the I2S output signals go through isolator chips (IL715) and thereby gets slightly degraded (jitter-wise). The reclocker module (AKL series) serves to clean up the I2s signals from the EXA unit. The reclocked + bufffered outputs are on w.fl coax headers to match the DAC module (AKD12P). Pin headers from the AKL connect directly to the EXA2UI output terminal block as shown.

The re-clock Flip-flops are clocked by the same MCLK as that of the DAC (100M). Used this way results in Async Re-Clocking.

I have also added Clock isolator on board so that the divided slave clocks from the AKX701 Clock module can be safely piped into the EX2UI for Sychronous Re-Clocking. As the reclock MCLK freq is much higher (100M) than the transport clocks (25M), I am hoping that this 'Turbo' reclocking technique will be able handle higher sample rates without problems.

Also added on board is a Sample Rate DAQ and transmitter (I2C comms). The MCU can read Fs direct from the transport and display accordingly.

Shown is 2CH version. 8CH with AKD18 DAC, similarly.
Other tranports can similarly benefit from this arrangment and I will be rolling these out soon.
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Old 14th December 2012, 07:21 AM   #610
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Will it be offered for sale?
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