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Old 7th January 2006, 07:15 PM   #1
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Default AD1865 w/ USB?

I am starting research for making a NOS DAC based on the AD1865. My sense is that I am pretty much going to use the audio note design (cs8414/74HC02/AD1865), perhaps with some tweaks.

I would, however, also like to add a USB input. The only way I can think to do this is to use a chip like the pcm2902 or pcm2707 to output s/pdif to the receiver. Are there any better options? Any suggestions would be most helpful.

-d
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Old 7th January 2006, 07:28 PM   #2
hifi is offline hifi  Sweden
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I would opt for a Pcm2707 and a couple of Iso150 to get galvanic insulation from the Pc.

Seems silly to me to convert back and forth between formats if it can be avoided.
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Old 30th January 2006, 03:21 PM   #3
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Hi all

Any progress on theAD1865 DAC with USB input? I am very interested into it, but a complete noob on designing, just a copying guy.

I like non oversampling DAC’s, I’ve got the CS8412, TDA1543, TDA1541A, AD1865. I am building a board for the CS8412 with microswitches to select the mode of operation, so it can feed all of the mentioned DAC chips, to allow comparison.

I recently found the USB input board from www.dddac.de using the PCM2707 chip. A very nice solution for the TDA1543 and I imagine also for the TDA1541A…but the DAC chip where I am most interested in, the AD1865, can probably not be (directly) supported through it. But if anyone has a solution I would like to see it very very much.

Erik
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Old 31st January 2006, 12:24 AM   #4
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I did my own pcm2707 to tda1543 if you are interested: http://www.ecp.cc/NOS-USB-DAC.html The boards will cost you $60 for 3, but after that the components are pretty cheap (~$50 per board to populate it.)

As for the AD1865 -- I have made a little, but not much, progress. I am still working on it, but it is about 8th in line behind some other projects, so it'll be a few months. I still don't have any brilliant ideas for a different design though.
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Old 27th February 2006, 12:47 AM   #5
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Hi dsavitsk

Sorry for the late reply! Thanks for the offer, sounds very nice, at first I thought: why would I use three boards, but then I thought: one for the main system, one for a portable dac and one for my hobby room. Just a question, silly one: does this one work for the TDA1541A too?

Erik
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Old 27th February 2006, 04:55 AM   #6
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the 1541 is a dip28 chip while the tda1543 is dip8, so you couldn't sub directly. I am working on an update using the tda1541 though, so I might get that done in a few weeks. also, just to be clear, at least for now I am not selling boards. You have to get them made with the files.
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Old 28th February 2006, 11:47 AM   #7
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Hi dsavitsk

I should have been more specific. What I wanted to know is if the I2S output from the PCM chip can also be used to feed a TDA1541A. But now I read you are making a board for the TDA1541A I assume this can be done! Thinking about it, a board for the PCM2707 + TDA1541A would be great! I think there will be lots of interest in it! Let's see...

Erik
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