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AK4458 multichannel DAC with I2S input
AK4458 multichannel DAC with I2S input
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Old 17th July 2017, 11:55 AM   #91
zarandok is offline zarandok  Germany
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Hm... The datasheet of LT3042 writes: 0,8uVrms 10Hz-100kHz and 2nV/SqrtHz@10k spot noise. What is a spot noise at all??
But I think noise is just one factor, transient behavior is just as well important.
So do you have better listening impressions with LT3042?
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Old 17th July 2017, 12:49 PM   #92
Dimdim is offline Dimdim  Greece
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AK4458 multichannel DAC with I2S input
I mentioned spot noise just because the Tent Labs shunt specifies it for their regulator.. It's just a way of "expressing" noise corresponding to a specified bandwidth.

Sure, all characteristics of the power supply matter, including output impedance in this case and PSRR.

Indeed, I have done listening tests with the LT3042 vs. the Trident units in my Buffalo and the LT was clearly better. More resolution, more natural sound, darker background.

But I have not done any comparative testing on AKM DACs (yet).
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Old 18th July 2017, 01:12 PM   #93
zarandok is offline zarandok  Germany
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Thanks Dimdim!
I think I'll design a small LT3042 panel, size und pin compatible with my shunts. This IC costs only about 5€. And then I can easy compare myself which is better...
(I will let manufacture with the DAC pcb-s together)
Do you have maybe a free design for that? Or are there some specialities?
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Old 18th July 2017, 01:27 PM   #94
Dimdim is offline Dimdim  Greece
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AK4458 multichannel DAC with I2S input
There's not really much to it. I'm attaching my Trident replacement design.
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File Type: zip Trident_Replacement_v25.zip (16.6 KB, 15 views)
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Old 18th July 2017, 08:08 PM   #95
zarandok is offline zarandok  Germany
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Thanks!
I have imported it to DipTrace, and so there are no copper pours. But not a big deal, it's a very simple pcb...
(but this tiny MSOP package.... I don`t know, is it possible to solder it at home?)

Last edited by zarandok; 18th July 2017 at 08:38 PM.
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Old 18th July 2017, 08:42 PM   #96
Dimdim is offline Dimdim  Greece
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AK4458 multichannel DAC with I2S input
I've soldered a bunch of them, all at home.

But you will need some magnification..
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Old 19th July 2017, 11:12 AM   #97
zarandok is offline zarandok  Germany
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Ok, I'll try it. But before I must complete my shunts...
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File Type: jpg schematic.jpg (595.8 KB, 46 views)
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Old 20th July 2017, 06:18 AM   #98
zarandok is offline zarandok  Germany
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Some simulations made with TINA. What I don't understand: the output resonances about 100-200kHz (depending from the output capacitor size).
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File Type: pdf SHUNT-simulations v0.93_1.pdf (376.2 KB, 9 views)
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