Author Topic: Want to build multichannel audio interface  (Read 728 times)

Offline Zipdox

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Want to build multichannel audio interface
« on: November 14, 2020, 12:02:14 AM »
I am kind of a music/recording guy and I'm interested in building my own multichannel (4 or more) ADC. I've looked online and I found a hackaday post of a high end stereo DAC, but not much about ADCs, let alone multichannel ones.

I was hoping there's a single USB chipset with more than 2 analog inputs but I wasn't able to find one. All chipsets with builtin ADCs feature 2 inputs at most. I looked up some internal photos of professional equipment and all of them use separate ADC chips and USB chips.

After some googling I came to the conclusion that the only viable chips for multichannel ADCs are those from Cirrus Logic (considering CS5368), which are priced around 18$ per chip for an 8 channel one. Then I still need to find a USB interface chip. The ADCs are also controlled (or programmed, I don't know) through I2C or SPI which makes life more difficult.

I have no idea how to approach this.

Does anyone have any experience or advice with this kind of thing?
« Last Edit: November 14, 2020, 12:20:47 AM by Zipdox »

Offline TMaxElectronics

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Re: Want to build multichannel audio interface
« Reply #1 on: November 14, 2020, 09:13:51 PM »
I think the easiest way to do this would be with a microcontroller that has a USB interface.
I usually use PICs and there are some usb-audio example projects available on the net, and I'm sure that other manufacturers have the same.
You would need external ADCs for that though... unless you only want 12bits :P

The small pic32mx devices might be fast enough, but I can't comment on that, as I have only used them for MIDI, where the throughput is a lot lower obviously :D
That pic also has some audio support in its serial modules, but I also haven't ever used that...

Do you need stereo or mono channels?

Offline Zipdox

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Re: Want to build multichannel audio interface
« Reply #2 on: November 15, 2020, 01:06:11 AM »
What do you mean by stereo or mono channels? A stereo channel is 2 channels really.

Offline Zipdox

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Re: Want to build multichannel audio interface
« Reply #3 on: November 16, 2020, 06:58:44 PM »
I did some more research and there appears to be a more economic 8 channel ADC chip, AK5558. It's on Digi-Key for $9.55.

For the microcontroller, I'm hoping an STM32 is suitable, because they're cheap and readily available.

Offline Da_Stier

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Re: Want to build multichannel audio interface
« Reply #4 on: November 16, 2020, 07:25:04 PM »
Depending on your level of programming skills and the time you want to spend, an arduino micro might be interesting as well, it has a native usb port already integrated.
For the external DACs / ADCs you could start by searching for the audio variety on Digikey (I believe you can filter the use to be audio) and then take a look at the recommended circuit and layout in the datasheet.
Especially the higher bit ones (like 16 to 24 bit) require a bit of attention to perform well.

There are also evalkits for basically what you want to build.
However they are not really cheap at all.
https://www.digikey.at/products/en?mpart=CDB4270&vendor=598
They would contain all you will need and was designed by the people who produce the ICs, which is a good thing most of the times.
However something like this might be a good starting point, since you can have a look at what you need.

Offline johnf

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Re: Want to build multichannel audio interface
« Reply #5 on: November 17, 2020, 08:07:36 PM »
Check out Silicon chip magazine they have recently run articles on a very high end two channel system
might give you ideas for your own one article was usb supercodec

http://www.siliconchip.com.au/Issue/2020/November/Balanced+Input+Attenuator+for+the+USB+SuperCodec
complete codec started in the August issue

Offline Zipdox

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Re: Want to build multichannel audio interface
« Reply #6 on: November 18, 2020, 10:35:09 PM »
Check out Silicon chip magazine they have recently run articles on a very high end two channel system
might give you ideas for your own one article was usb supercodec

http://www.siliconchip.com.au/Issue/2020/November/Balanced+Input+Attenuator+for+the+USB+SuperCodec
complete codec started in the August issue
Two channel interfaces are trivial. They can be made with off-the-shelf components really. That's why I'm specifically talking about multichannel.

Offline Zipdox

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Re: Want to build multichannel audio interface
« Reply #7 on: November 18, 2020, 10:38:29 PM »
Depending on your level of programming skills and the time you want to spend, an arduino micro might be interesting as well, it has a native usb port already integrated.
I highly doubt an Arduino micro would be able to support the required USB bandwidth and support I2S. The programming skill I think is not a problem if I stick to STM32. Though I still have to find a way to implement USB.

There are also evalkits for basically what you want to build.
However they are not really cheap at all.
"not cheap" is an understatement.

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Re: Want to build multichannel audio interface
« Reply #7 on: November 18, 2020, 10:38:29 PM »

 


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