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Old 23rd August 2019, 05:21 PM   #771
Markw4 is offline Markw4  United States
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Join Date: Jul 2016
Location: California
Quote:
Originally Posted by ishizeno View Post

The deal is pretty simple:

1. You make a post on this thread explaining why you should get a free kit.


Quote:
Originally Posted by ishizeno View Post
Kit #2 has been called for, this one heading down to Brisbane, Australia.
So, people making requests can give their reasons for wanting one in private?

Last edited by Markw4; 23rd August 2019 at 05:38 PM.
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Old 23rd August 2019, 05:30 PM   #772
ishizeno is offline ishizeno
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Join Date: Mar 2015
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Originally Posted by manudrz View Post
I already have a 117 pages AK4499_myakm.pdf and a brief 10 pages AK4499EQ.pdf. The first one have a recommanded external circuits (fig. 81). I'll wait for what you will post in a few time, thanks!

I'm looking for my personal project, combo this awesome chip with my DSP
These are not enough. You'll need the evaluation board's manual if you want to understand how to properly use this converter.

But our schematics should help as well.

Integrating this with a DSP should be really cool. Which DSP chip are you using? We're going to use the AM5728 Sitara.
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Old 23rd August 2019, 05:42 PM   #773
ishizeno is offline ishizeno
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Join Date: Mar 2015
Quote:
Originally Posted by Markw4 View Post
So, people making requests can give their reasons for wanting one in private?
Yes. I am not looking for any kind of public endorsement.

Thanks a lot for helping me clarify this.

Mark, I must say that I love your attention to details.
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Old 23rd August 2019, 05:56 PM   #774
manudrz is offline manudrz  France
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Join Date: Feb 2012
Location: Fougères
Quote:
Originally Posted by ishizeno View Post
These are not enough. You'll need the evaluation board's manual if you want to understand how to properly use this converter.
OK it's the one I don't have, you're right it's not public (yet?)



Quote:
Originally Posted by ishizeno View Post
Integrating this with a DSP should be really cool. Which DSP chip are you using? We're going to use the AM5728 Sitara.
It's a combo, 1701 for crossover/volume etc and 1452 for FIR. Just a little board with the add-on for FIR, but I can get the i2s outs and stack 2 stereo DACs or one 4ch DAC under it.
It's just a huuuge project for a little guy like me
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Old 23rd August 2019, 06:16 PM   #775
ishizeno is offline ishizeno
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Join Date: Mar 2015
Quote:
Originally Posted by manudrz View Post
OK it's the one I don't have, you're right it's not public (yet?)




It's a combo, 1701 for crossover/volume etc and 1452 for FIR. Just a little board with the add-on for FIR, but I can get the i2s outs and stack 2 stereo DACs or one 4ch DAC under it.
It's just a huuuge project for a little guy like me
This is an awesome project!

I sent you a PM.
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Old 23rd August 2019, 07:21 PM   #776
ishizeno is offline ishizeno
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Join Date: Mar 2015
Quote:
Originally Posted by manudrz View Post
OK it's the one I don't have, you're right it's not public (yet?)




It's a combo, 1701 for crossover/volume etc and 1452 for FIR. Just a little board with the add-on for FIR, but I can get the i2s outs and stack 2 stereo DACs or one 4ch DAC under it.
It's just a huuuge project for a little guy like me
For your project, you might be able to use our DAC board as some kind of "DAC on Module" (DAM) or "Converter on Module" (CAM). It will have the AK4499 with the big capacitors and the I-V stage. Nothing else. It will be quite small though.
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Old 23rd August 2019, 08:01 PM   #777
ishizeno is offline ishizeno
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Default Kit #3

Kit #3 has found a welcoming home in California.
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Old 23rd August 2019, 08:46 PM   #778
ishizeno is offline ishizeno
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Default Kit #4

Kit #4 is heading out to California as well. I can assure you that this one and its older brother will be in really good hands...
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Old 23rd August 2019, 09:16 PM   #779
ishizeno is offline ishizeno
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Default Kit #5

Kit #5 is heading to France and will be shared among a couple of developers.
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Old 24th August 2019, 12:45 AM   #780
hochopeper is offline hochopeper  Australia
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Join Date: Feb 2009
Location: Brisbane, Australia
Going back about 10 pages there was some discussion regarding power supplies. I wanted to throw a reference in to the mix - Simple Isolated +/-15V Split Rail



– QuantAsylum
- this page shows a design for an isolated +/-15V from 5V in that could be used for the opamp supplies. May wish to explore different LDOs though. The low power handling would mean a bit of a change of the topology currently proposed (probably won't have enough power to drive the opamps as well as VREF regulator and MVDD). But the isolation may be worthwhile.

Another separate observation on clicking back through the thread is that the OTOBUS pin out looks to have very few ground connections. For all digital signal wires there should be an adjacent pin connected to ground. For signal integrity and EMI it is important to have a return path as close possible to the signal wire, particularly for fast (short rise time) signals. This ensures that the loop area of the signal path is minimised.

Chris

Chris
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