Amanero Isolator/Reclocker GB - Page 43 - diyAudio
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Old 12th March 2013, 01:39 AM   #421
acko is offline acko  Australia
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Default Reference Clock (RCK)

Quote:
Originally Posted by KlipschKid View Post
What are the options/requirements for RCK ? It seems to be the clock pulse for the flipflop ?
Yes, RCK is the reference clock for the flip-flop. The quality of the regenerated output signals depend on this clock and also how cleanly the flip-flops switch. If you skimp on these the overall SQ may not be up to expectations.

RCK can be from a separate clock or tied to DAC MCLK. When used separately RCK is async w.r.t to the audio signals (I2S/DSD) and actually modulates the pulse width of the signals if you look at the timing/switching carefully. To minimize the effects RCK should be running higher that the max Fs, higher the better accuracy of the outputs. e.g. for 24.576MHz of typical transport clock, we are looking at ~50MHz minimum. 100MHz even better. Of course you could go higher if the Flip-flops can take it. The S01 ~200Mhz max but the PotatoChip version (S02) can be fried up to 600MHz! If also appears that XOs have better stability and lower phase noise at higher freqs and also there are some discussions on this SAW technology being better? .... so lots to experiment with these boards
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Last edited by acko; 12th March 2013 at 01:52 AM.
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Old 12th March 2013, 01:46 AM   #422
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Thanks Acko. My cm6631 has 45/49mhz clocks and the dacs to try this with have various clocks or none, so I'll need another xo. I have some Fox Xpresso 100 and 125Mhz left over from the es9018 so I'll try them first, and then look at buying lower phase noise/higher freq ones. SAW works great with es9018 but I haven't tried it with any other dac. might be fun. thanks again.
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Old 12th March 2013, 01:48 AM   #423
acko is offline acko  Australia
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Quote:
Originally Posted by KlipschKid View Post
If I don't use u.fl, and instead mount the board very close to the DAC input, say <1cm away, what would be the best connector ? Solid core, say 18awg ? or flat copper strip, and if so, how wide ?

thanks
KK, you may connect with ordinary wires, links or twisted pairs if DAC is sufficiently close but take care as there is nothing to prop up the signals after they have left the board- ideally, should go straight into DAC inputs
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Last edited by acko; 12th March 2013 at 01:52 AM.
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Old 12th March 2013, 02:48 AM   #424
acko is offline acko  Australia
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Default BIII/BIIISE

Quote:
Originally Posted by acko View Post
....
... - ideally, should go straight into DAC inputs
There appears additional devices in the signal path on the DAC board before the inputs of the BIII (sidecar function) series. These will then influence the final signal quality. The same goes for anything you add after the re-clocker board, relays, switches, mux etc ...
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Old 12th March 2013, 03:52 AM   #425
acko is offline acko  Australia
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Default RCK

Quote:
Originally Posted by acko View Post
....
PotatoChip version (S02) can be fried up to 600MHz!
...
The output signal signature will still be that of the input signals (FF action). A simple test is to apply dc logic (3.3V) on the inputs and check the corresponding outputs (yes, you can re-clock dc). There should be no trace of the reference clock (RCK) on the outputs.
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Old 12th March 2013, 05:18 AM   #426
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Thanks !

I was thinking about adding an MUX, Potato 3B20, on the input. Anyway, I'm gonna try to get the output as close to the DAC IC as poss.

What about filling unused vias with solder ? Good or bad for this ?

cheers,

Tom
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Old 12th March 2013, 05:25 AM   #427
syklab is offline syklab  Hong Kong
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Quote:
Originally Posted by KlipschKid View Post
Thanks !

I was thinking about adding an MUX, Potato 3B20, on the input. Anyway, I'm gonna try to get the output as close to the DAC IC as poss.

What about filling unused vias with solder ? Good or bad for this ?

cheers,

Tom
Hi Tom,
What is the usage of the Potato 3B20 your are adding to the Amanero Isolator/Reclocker ?

Thanks
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Old 12th March 2013, 06:53 AM   #428
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Hi, it's an i2s switch, same as 74hc157. I've used 74vhc157 before but not the 3b20. Connect the "usually on" i2s source to one set of inputs and usb/i2s to the other and use the power of the usb to trigger the switch to usb/i2s, so it automatically selects usb when usb is plugged in, and selects the "usually on" i2s source if no usb is connected. Does that make sense ?

So amanero is the usb/i2s and the mux/switch allows a different i2s input when the amanero is unplugged from the pc.

Last edited by KlipschKid; 12th March 2013 at 06:57 AM.
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Old 12th March 2013, 07:12 AM   #429
syklab is offline syklab  Hong Kong
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Quote:
Originally Posted by KlipschKid View Post
Hi, it's an i2s switch, same as 74hc157. I've used 74vhc157 before but not the 3b20. Connect the "usually on" i2s source to one set of inputs and usb/i2s to the other and use the power of the usb to trigger the switch to usb/i2s, so it automatically selects usb when usb is plugged in, and selects the "usually on" i2s source if no usb is connected. Does that make sense ?

So amanero is the usb/i2s and the mux/switch allows a different i2s input when the amanero is unplugged from the pc.
I.C., I bought the otto2 from TPA for that but too lazy to hock it up, so when I get the Amanero isolator then I will try it.

Thanks for the info.
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Old 12th March 2013, 07:44 AM   #430
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Otto 2 looks like the same thing (which IC ?) so I'd use that if you have it.
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