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ADAU1467 Evaluation board?
ADAU1467 Evaluation board?
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Old 18th March 2018, 12:43 AM   #1
KaffiMann is offline KaffiMann  Norway
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Default ADAU1467 Evaluation board?

Hello.

I have been reading up on the ADAU1467 EVM, more specificly, the components involved, circuit layout, and features.

Really starting to consider purchasing one of these EVM's to use on a permanent basis in one of my setups.

Pieces involved:
AD1937 as ADC/DAC, this is a 4 in 8 out chip, that can be daisy chained for more ins and outs if needed. Specs give 112db S/N figures at -60db input, whatever that means, and -86db THD+N all eight outputs running at the same time. This is measured at 48khz sampling rate, maybe there can be a little something to gain from running 96khz? I do not know. Are they measuring it this way to give some form of realistic numbers should one choose to run a pre-amp before the chip? I do not know.

The ADAU1467 chip itself itself boasts 139db dynamic range and -120db THD+N for the sample rate converters. Other than the large number of fancy functions expected.

ADA4610-1 JFET op amp Buffers the common-mode output of the AD1937 codec for distribution to the analog filters.

ADA4841-2 Low noise op amp. Implements the analog audio filtering required for the stereo line inputs and outputs

Eval board summary:
There are settings for all sorts of things, for instance master clock and PLL mode, they have also put 2 10kohm potmeters on the PCB, these potmeters are configureable through the SigmaDSP system, and as far as I can tell limited to almost any function you can make variable!
Inputs outputs: there are 2 sets of stereo Analog In, 1 optical in, 1 optical out, 4 sets of stereo analog out.

The Eval board is not very expensive, and it seems it might make a reasonable all-in-one solution as a pre amp + dsp thing.


People smarter than me please tell me the pro's and cons!
Because all I'm seeing is a great thing that solves all my needs/wants, so help the blind here!

Good match for 2 x TPA3255 EVM's in BTL?

ADAU1467 Datasheet and Product Info | Analog Devices

Last edited by KaffiMann; 18th March 2018 at 12:50 AM.
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Old 31st May 2018, 09:53 PM   #2
KaffiMann is offline KaffiMann  Norway
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I've been short on cash for a while now, but finally things are shaping up again, seeing as the ADAU1467 has not been in stock yet, I very recently noticed the EVM board for the younger sibling, the ADAU1466 completely unexpected IN STOCK on mouser, and ordered it immediately. Price is the same, specs a tiny bit lower than the '67 but the layout is more practical for my needs/wants.

Just got the ADAU1466 in the mail, and it's tiny! :-)

Such a cute little thing. have not had the time to look at it properly yet, so much going on. maybe I'll get to play with it sometime this weekend. So excited!

Have been unhappy with my PC based XO's for some time now, no matter what program or solution I end up with it feels like too much of a compromise, for some reason I get glitches periodically no matter what the buffer settings are. And it does not sound as "transparent" as I would like. Not sure if this EVM board will be the holy grail either, but very ready for a change, and also just use optical out to break some other issues as well.

Last edited by KaffiMann; 31st May 2018 at 09:56 PM.
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Old 16th June 2018, 03:42 PM   #3
KaffiMann is offline KaffiMann  Norway
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Been able to give priority to look at the Sigmatudio program a little bit.
It is so full of functionality that it is a little bit hard to get going, but I've managed to get some filters going (had to play around a bit to get it right), set up volume control via one of the aux adc potmeters (which was REALLY tricky). The not-so-obvious thing for me at first was that you have to set up EVERYTHING including channel mapping on the internal matrix. It is very easy NOW, but for a while there I could not understand why the f*** there was no audio in on my level meters at all.

Slowly plodding along, but so far it's really promising, using 48khz/32bit and just testing out stuff, but not far from the program I will use permanently.
Next on the list is trying to use the other on-board aux adc potmeter as an input source selector, will probably have to run through some logic functions to get there.

If there's anyone else out there that took the plunge on one of these eval boards it would be nice to exchange some tricks.
If there's any need for my absolute n00b setup, just ask and I will try and contribute in any small way, might be helpful.
I'll post my setup if anyone is interested in my partial success, if not I'd rather wait until I got it all nailed down.

Kent
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Old 20th June 2018, 01:13 AM   #4
Jared is offline Jared
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I just pulled the trigger on a lower end chinese clone eval board for the adau1701. Did you find any good resources to learn sigmastudio or just learn by doing?
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Old 20th June 2018, 12:00 PM   #5
KaffiMann is offline KaffiMann  Norway
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First of all:
Read the ADAU1701 Evaluation Module manual.
http://www.analog.com/media/en/techn...des/UG-072.pdf


Then:
Learn by doing, the manual is a sort of *nudge* to get going, help files etc are useless, some info on functionality can also be dated and no longer relevant (probably not the case with ADAU1701).
It's not difficult to get the basics going, but there are just soooooooo many functions/features/algorithms/etc. if you want to do fancy stuff.

After you got the EVM manual, and have done the steps to figure out the basics there, click around a bit to get your signal routing going, then we can figure out the more advanced stuff together :-)

Last edited by KaffiMann; 20th June 2018 at 12:07 PM.
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Old 22nd June 2018, 01:05 PM   #6
ernperkins is offline ernperkins  United States
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Analog devices has a SigmaStudio wiki with a lot of good information and tutorials: LINK.

You can also check youtube and search for Sigmastudio.
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Old 22nd June 2018, 01:11 PM   #7
KaffiMann is offline KaffiMann  Norway
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Some of the information on there is good, other things is just vastly out-dated.
Like for instance this:
Single Slew External Volume [Analog Devices Wiki]

Says nothing of HOW you get it working with the 10 bit ADC's.
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Old 22nd June 2018, 05:56 PM   #8
Jared is offline Jared
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I think there is only 1 10bit ADC, and a multiplexer to select which input it is reading from, which is similar to a lot of the arduino / ARM / esp8266 embedded stuff I have played with a tiny bit.
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Old 22nd June 2018, 08:03 PM   #9
dspswede is offline dspswede  Sweden
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I have ADAU1467 eval board and I have also now designed my own board in kicad.

8 ch in, 16 ch out
spidf, bluetooth 5.0 module -> i2S
Raspberry interface as optional use, etc

see attached pics

i did run trough the examples in the eval board doc

i also have a mosconi 8to12 based on an older dsp in same family.
it was that one that inspired me to design my own.
Attached Images
File Type: png adau1467.png (166.4 KB, 240 views)
File Type: png dsp.png (155.9 KB, 241 views)

Last edited by dspswede; 22nd June 2018 at 08:13 PM. Reason: clarification
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Old 24th June 2018, 10:37 AM   #10
KaffiMann is offline KaffiMann  Norway
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Very nice! Are you considering making some group buy or?
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