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Old 11th March 2013, 09:58 AM   #1291
diyAudio Member
 
Join Date: Oct 2007
Location: Aarhus, Denmark
@chicco_36: You might also consider the DSD1794 from TI which allows for up to DSD256 or PCM384 kHz (with an external digital filter) according to Bunpei (haven't yet had the time to test it myself). But it requires you to be able to program some registers so as to use the DSD feature.

This might, however, be possible via the Amanero board just haven't looked into it yet.

Based on my previous searches one of the AK or WM better DACs are the only ones that allow for both PCM and DSD playback (64*fs) using hardware (pin level) settings. The CS DAC also requires programming registers. But I didn't check all DACs in the market so there may be others ...

For a not-too-time-consuming solution you might find this interesting:

Opus - A Balanced DAC

Best regards,

Jesper
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Last edited by gentlevoice; 11th March 2013 at 10:07 AM.
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Old 11th March 2013, 11:22 AM   #1292
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I received the amanero board today, haven't had time to test it though;
Big thanks to Domenico, he's a real helper !
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Old 11th March 2013, 01:06 PM   #1293
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TNT, gentlevoice, thanks for your replies.

“Native DSD = no conversion to PCM before the "D/A" process. I don't think any of these chips qualify to that definition but I'm sure my guess will be turned into knowledge by fellow forumists.” - TNT

Actually, a lot of modern DAC’s have direct DSD input, the real question is how we unknowledgeable audiophiles can use them (preferably in some simple hardware mode)...

gentlevoice, i see you have DSD1794. Great DAC, but from block diagram of his datasheet i don’t think it’s easy to implement DSD input. At least not without some software programing or some external switcher i guess.

For example AK4399 have same input pins for PCM and DSD so implementation “must be” easier.

Thanks for the link about Opus DAC, some first hand experience from someone who actually pair it with amanero board will be more than useful !

Thanks for your patience,
Chicco
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Old 11th March 2013, 02:28 PM   #1294
Marek is offline Marek  Poland
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If you use Amanero USB-I2S you can automatically configure any DAC chip via I2C bus by setting events and commands using OEMtool.
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Old 11th March 2013, 02:30 PM   #1295
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Quote:
Originally Posted by Marek View Post
If you use Amanero USB-I2S you can automatically configure any DAC chip via I2C bus by setting events and commands using OEMtool.
Wonder if anyone has actually tested that, so far there is no confirmation that it actually works.
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Old 11th March 2013, 05:23 PM   #1296
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@Marek & Jackal29a:

I really would like to try if it works but I can't find a "translator" on the internet that can translate the register values of the DSD1794 to the values used on the combo384 - and although I probably heard about this during my engineering studies I don't remember about it (have worked with different areas). One of you know how I can translate register values to the ?? values used on the combo384?

Maybe there's an internet translator?

@chicco:

Quote:
gentlevoice, i see you have DSD1794. Great DAC, but from block diagram of his datasheet i don’t think it’s easy to implement DSD input. At least not without some software programing or some external switcher i guess.
No, that's right ... I actually hope one of the modes will prove to be more to my liking so I don't have to switch in practice ...

Ciao ;-)

Jesper
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Old 11th March 2013, 05:40 PM   #1297
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Hi again,

FYI ...

TARA Labs RSC conductor give-away ...

Best,

Jesper
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Old 11th March 2013, 06:39 PM   #1298
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You can get the register values from the graphic tool TI provides to control the PCM/DSD1792a evaluation board (same registers and values as the DSD1794).

This is the PCM1792a page: Audio Converter - Audio DAC - PCM1792A - TI.com

Scroll down to the bottom and look for "Software & Development Tools (1)" or get it from this link: http://www.ti.com/litv/zip/slac244

To check what registers you need to modify get the DSD1794 data sheet, you'll also find the address value.

Once you have the tool, extract the content ot a folder, run the .exe and in the window that pops up got to "Window (W)" and select "Operational Control (O)" and "Function Control (F)" then you'll get something like this:

Click the image to open in full size.

Then you can play with settings and see how the final value for each register changes. The value is in the hexadecimal format the Combo firmware tool wants.

All three fields (address, register and value) have to be written in hex.:

Click the image to open in full size.

I don't have a software mode capable DAC so I haven't been able to play with this but I'm sure Domenico will help if asked about this. It'll also be nice if anyone with experience in programming a uC for BB DACs could comment on how to pass the complete "sentence" to the chip.
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Old 11th March 2013, 08:23 PM   #1299
amanero is offline amanero  Italy
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hello thank you for the GB4, i hope to ship all during this week, i got some delay with shipments because i was away from Pisa.

I just uploaded a firmware version 1.072 with I2C speed at 100Khz.
Please use this maintenance tool http://www.amanero.com/oemtool111a.zip

The OnMute event is enabled and the OnVolumeChange too.

About the OnVolumeChange insert address [0x49], register [0x0], and the number of sequential registers to modify with a volume value between 0 - 127 for example 8.

Thank you!
Domenico

Last edited by amanero; 11th March 2013 at 08:27 PM.
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Old 11th March 2013, 08:32 PM   #1300
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Is there any chance of a linux firmware tool? Perhaps release source code to compile a linux command line tool?
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