What IC is used to send dig data from usb to DAC? - diyAudio
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Old 2nd April 2012, 05:55 PM   #1
kevloon is offline kevloon  United States
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Default What IC is used to send dig data from usb to DAC?

Ive always been interested in learning more about the process of USB to DAC. I am attempting to teach myself about how USB actually sends and receives audio steaming data. Can anyone point me in the direction of a well adapted USB streaming IC, I am not even aware of what this type of IC would be called so I cant find any!
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Old 4th April 2012, 07:49 PM   #2
kevloon is offline kevloon  United States
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with the TAS1020B, it is called usb audio steamer, but it requires rom and programming. Firsttly I do not have a way to program it, and secondly I have never dont any kind of USB programming had have no idea where to start with the TAS1020B. will the TAS1020B or similar chip come with preloaded software to run with windows audio drivers or is this a blank chip that NEEDS programming to be use at all? are there any chips that actually come set up to interface with windows audio driver and then output a serial or "I SQUARED 2" interface?
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Old 4th April 2012, 08:38 PM   #3
Julf is offline Julf  Europe
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Originally Posted by kevloon View Post
are there any chips that actually come set up to interface with windows audio driver and then output a serial or "I SQUARED 2" interface?
There are tons and tons of USB-to-I2C interfaces, but there is no reason they should be restricted to just audio or windows. No point in making a chip that only works for one application on one operating system.
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Old 5th April 2012, 12:33 AM   #4
kevloon is offline kevloon  United States
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Which makes a lot of scene for a company with equipment and experience behind them, but i have neither. I need something that an operating system, windows based is what I use, can recognize as an audio device and be used as a standard sound-card with windows. How much configuring and programming would be needed on my end if i ordered a usb to i2c chip from mouser or digikey.
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Old 5th April 2012, 02:28 AM   #5
kevloon is offline kevloon  United States
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basically as i said, I know very little about USB, but a decent amount about DAC and the audio process. My interest is rooted very firmly in diyaudio, and any IC i can buy that will allow me to feed the digital signal to the dac and by pass any interface/USB/ programming will help me tremendously.

Now I have after your last message looked into the USB to I2C devices on sites like mouser.com, but none are tailor made to work in a streaming audio application. They just list windows 7 (32-64bit) driver compatability and list a few applications that MIGHT be useful. None of which deals with audio.

Now are USB to I2C chips what i need to be looking into?
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Old 5th April 2012, 03:24 AM   #6
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Windows, Linux and Mac have a generic audio driver for USB 1.1 devices.
The... most known IC that implement that function are made by TI.
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Old 5th April 2012, 04:01 AM   #7
kevloon is offline kevloon  United States
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that is a perfect first build. I was hoping for a similar application but a higher bit and sample rate. full 24/96k would be perfect. how do I interface a DAC with a usb controller IC
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Old 5th April 2012, 10:02 AM   #8
Julf is offline Julf  Europe
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Originally Posted by kevloon View Post
how do I interface a DAC with a usb controller IC
Depends on your DAC. What kind of inputs does it have? Does it have i2c?

Wouldn't it be easier to use something like a Musical Fidelity V-link (USB to S/PDIF interface)?
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Old 5th April 2012, 10:20 AM   #9
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This won't be an easy project, usually USB controllers require firmware that "tells" it what kind of task to perform and how it will show up in windows for example. This will require a lot of SW programming to be done. This firmware is usually stored in an eeprom or an internal flash memory in the USB controller.

At work we use a Cypress (CY7C68013A) device to interface USB2.0 to MPEG + I2C and we found that it is no trivial matter to get it to work right!

The HW interface between a USB controller and a DAC IC could be as simple as an I2C connection to configure the DAC and an I2S connection to transport the audio data.
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Old 5th April 2012, 11:34 AM   #10
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Quote:
Originally Posted by kevloon View Post
that is a perfect first build. I was hoping for a similar application but a higher bit and sample rate. full 24/96k would be perfect. how do I interface a DAC with a usb controller IC
The USB1.1 specs don't allow more than 16 bit/48kHz. In order to get past that you need an USB 2.0 device but for those there are no native drivers (in any operating system), so you need to provide those drivers too.
USB1.1 devices from TI don't require any controller to work.
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