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Old 6th February 2007, 04:29 AM   #1
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Default USB DAC at 24-bit

I have spent three days now searching so I feel I can post this without guilt

I can't seem to find a USB DAC chip that supports 24-bit. If someone knows of one please tell me!!!!

In the case that there is no such thing yet then I was wondering if anyone knew how to attach a USB controller chip to a 24-bit dac chip that doesn't support USB. I realize that this is a very noobish question, but I am sure that it is possible because there are 24-bit USB DAC's out there.

I know 24-bit is sort of silly but in this case it is important.

Thoughs? Thanks.

Milo
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Old 6th February 2007, 12:24 PM   #2
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Hi Milo,

virtually all of the 24bit DACs (or audio interface units as a whole) out there - which I know of - use a USB controller for communication and a dedicated DAC (or CODEC) for conversion.

Most common is the Texas Instruments TUSB3200/3210 series and their successors (see http://www.ti.com).

Hope this helps,
Sebastian.
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Old 7th February 2007, 01:34 AM   #3
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Sek,

I took a look at the TUSB3200 pdf. It explains a little to me. But I am very unused to digital circuits. Not that used to Analog circuits but I feel much more comfortable with them .

Do you have to program the TUSB3200? Or do you just connect it to the DAC? What pins am I looking for in terms of the USB controller sending information to the DAC and the DAC recieving.

Thanks for your help!

Milo

edit: Looked at some of the applications sheets and found a diagram connecting the TUSB3200 with the TLC320AD77. The TLC is a CODEC (not sure what the difference between a CODEC and an DAC is). The TLC looks like it is sending Analog out, but its also connected to a VREF filter. The TUSB is connected to a EPROM as well.

1. do I have to connect the VREF filter (what is it for)?
2. do I have to connect the EPROM (that means programming the damn thing right)?
3. There were mentions of firmware in regards to the TUSB. Does that mean I have to program it or just update its firmware with TI firmware updates.

Thanks for the patience.
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Old 7th February 2007, 03:32 AM   #4
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Such ICs are a heck more complicated than a USB DAC!

Yes, it means programming a firmware and supplying it to the TUSB via the EEPROM. TI supplies tools for all this, but it's still programming... although difficulty level: washing machine.

Vref is used because there also is an input in this application. CODEC means coder/decoder (ADC and DAC)
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Old 8th February 2007, 12:28 AM   #5
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The little voice that is saying "JUST BUY THE APOGEE" is starting to become a big voice... with a stick. Only my wallet stands in his way.

Thanks for the help. Ill do a bunch of reading and maybe Ill revive this thread at a later date when I know a little more. Thanks for your help Sek!

Milo
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Old 8th February 2007, 12:36 AM   #6
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Never heard something bad about the sound of an Apogee interface as of yet.
But it's of course not the only manufacturer of good interfacing equipment.

I hope you find what you need,
Sebastian.
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