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AK4490 USB Dac with dsd support.
AK4490 USB Dac with dsd support.
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Old 20th May 2015, 03:38 PM   #11
vitalica is offline vitalica  Europe
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DAC pre-order is as following:
stajo = 1
pinnocchio = 1
Press57 = 1
Myint67 = 1
rogerchou = 1
vitalica = 1
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Old 20th May 2015, 08:08 PM   #12
sonnya is offline sonnya  Denmark
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Thanks for the support.

I have attached distortion measurement for THD.

As you can see Harmonics are below background noise in my measurement system.
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File Type: pdf dsd64 - 1KHz.pdf (31.6 KB, 383 views)
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Old 21st May 2015, 05:37 AM   #13
pdb is offline pdb  Denmark
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Sonny, I know it is a difficult question for you to answer as the (co)designer, but in what price range do you feel this DAC is competing?
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Old 21st May 2015, 06:48 AM   #14
sonnya is offline sonnya  Denmark
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You can compare it to Lindemann Musicbook 10 over USB. This one cost €2800.
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Old 21st May 2015, 08:30 AM   #15
rredline is offline rredline  Singapore
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Heard that AK4490 works optimally on 7V instead of 5.5V.
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Old 21st May 2015, 08:38 AM   #16
sonnya is offline sonnya  Denmark
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Quote:
Originally Posted by rredline View Post
Heard that AK4490 works optimally on 7V instead of 5.5V.
Hello rredline.

I runs at 6.1V just below the voltage of the PCK0J152MCO1GS we use for bypass of VREF rails. They are polymer types with 8mOhm ESR value and keeps it very low (<20mOhm) to a few MHz. The capacitor we have choosen for VREF is also 1500uF.

So for sure you can gain better S/N ratio, but we get a better capacitor by reducing it to 6.1V instead. Also with 1500uF we improve it in the low range.

Click the image to open in full size.

So what do you want? gain 1 - 2dB better S/N ratio or having better overall results?

BR Sonny
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Old 21st May 2015, 08:51 AM   #17
rredline is offline rredline  Singapore
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Quote:
Originally Posted by sonnya View Post
Hello rredline.

I runs at 6.1V just below the voltage of the PCK0J152MCO1GS we use for bypass of VREF rails. They are polymer types with 8mOhm ESR value and keeps it very low (<20mOhm) to a few MHz. The capacitor we have choosen for VREF is also 1500uF.
Probably we can use Nichicon PCG1A152MCL1GS?
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Old 21st May 2015, 09:44 AM   #18
sonnya is offline sonnya  Denmark
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Yes, but board is locked to 6.1V ... So you do not gain anything here.

I was actually looking on the type you suggest, but dropped it due to the higher ESR value.
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Last edited by sonnya; 21st May 2015 at 09:51 AM. Reason: added comment
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Old 21st May 2015, 09:58 AM   #19
sonnya is offline sonnya  Denmark
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I have choosen to lock the mainboard.

There is a lot of different voltages here. 1V, 3.3V, 5V, 6.1V, +/-14V, +/-15V and +5.5V

So a wrong move experimenting with the mainboard will destroy a lot of parts.

On the Output shield board i encourage all to play around.

I am writing on a manual at the moment.
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Old 21st May 2015, 03:29 PM   #20
pinnocchio is offline pinnocchio  Canada
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Looking forward to this DAC!!
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