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Old 4th April 2013, 02:38 AM   #1
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Default AD1865 - single 5v supply.

I recently noticed on the AD1865 datasheet that it can be run from a single 5v supply quite interesting as it opens up the possibility of using the onboard resistors to make a neat portable AD1865 based dac.

Does anyone recall seeing a schematic for the AD1865 that runs on a single rail?
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Old 4th April 2013, 02:53 PM   #2
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If you are refering to the below paragraph of the AD1865 datasheet, they mean that the +5V digital supply pin (+VL), and the +5V analog supply pin (+VS) can be powered from the same +5V supply rail. Ideally, to minimize supply induced noise coupling, those two pins would each be powered from it's own isolated or independent +5V supply. They do not mean that the AD1865 does not also require a -5V analog supply rail (-VS), if that is what you were thinking. Please do let me know, however, if you believe I'm missing something here.

"Though separate positive power supply pins are provided for the analog and digital portions of the AD1865, it is also possible to use the AD1865 in systems featuring a single +5 V power supply. In this case, both the +VS and +VL input pins should be connected to the single +5 V power supply. This feature allows reduction of the cost and complexity of the system power supply."

Last edited by Ken Newton; 4th April 2013 at 03:02 PM.
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Old 5th April 2013, 07:56 AM   #3
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Thanks Ken - yes you are correct!

However in terms of a small pcb, have found a good alternative:
AD1865 based audio DAC with I2S input and voltage output

If anyone is keen on a group buy, PM me.

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Old 5th April 2013, 09:12 AM   #4
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Are you sure it's gonna work? I have been looking at that board for a while... I have vzs' board that also uses the AD1865 but with PCM input. It's meant to be used with Ian's PCM-I2S board. Seems to be a better solution to me. Still waiting for the finalized version though.
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Old 5th April 2013, 11:40 AM   #5
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Had a few email conversations with Pavouk - he seems to think it is great.
What is vzs' board? Do you have a link?

Am sourcing quotes on the pcb at the moment, have a few PMs already.
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Old 5th April 2013, 01:20 PM   #6
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I haven't made my board public since it was just a quick-n-dirty solution to try Ian's I2S to PCM board - even though it's working well ever since: link . As you can see it is a bare board with few caps, that's it, no regulator, no I/V, no format converter.

I'm working on a similarly bare board that will house 2x AD1865 DACs configurable either for balanced or parallel mode + u-fl connectors + buffered inputs. Don't ask when will be ready... priority is low.
Opposed to Pavouk I have regulators and I2S to PCM external to the DAC board - a more modular approach - matter of taste.

Pavouk's schematics is very simplistic but will work... his board is poorly designed for highish speed digital however it's commendable he made a clean layout on one side.
Ask him (or do it yourself) to add a ground plane to the top and you'll be fine.

Last edited by vzs; 5th April 2013 at 01:30 PM.
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Old 5th April 2013, 04:19 PM   #7
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Yes, that's what I am also waiting for. Just a bare DAC module with options for external power supply and other stuffs would be a lot more flexible. I am not really impressed by Pavouk's integrated PSU...
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Old 5th April 2013, 05:45 PM   #8
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I've built pavouk's I out board and replaced the 78l05 regulators with low noise MIC5207 soldered on adaptors. Im really happy with the sound (best digital source i had so far) but it is also the first time i listen to a multibit dac so i dont have previous point of reference. Right now im trying to make a ground plane version of pavouk's design but i dont how this will turn out given the fact that i am new to this hobby and dont have any education on electronics
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Old 5th April 2013, 09:01 PM   #9
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Agree the psu could be better, but it does satisfy the recommendations in the datasheet. I've got three spare ad1865 chips, so will give it a go and also wait on vzs double barrel approach : )
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Old 5th April 2013, 11:38 PM   #10
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I am interested in the chips if you want to let a couple of them go.
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