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DAC AD1862: Almost THT, I2S input, NOS, R-2R
DAC AD1862: Almost THT, I2S input, NOS, R-2R
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Old 11th January 2021, 01:46 PM   #1291
diyiggy is offline diyiggy
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I know we ask a lot and I'm thankfull for all the sharing here, but have you considered the same little board that is already fine, but with an opa 861 transimpedance stage for the I/V (no feedback, very few parts though smd are better for the caps but not always mandatory for stability depending on the powersupply quality and a further aop, double this time and I strongly think about an opa 1656 here (there smd and vias for decoupling being important imo for tweaking-adaptation taste purpose) ? While it coul be still be 627pb with two single pads !


What soft are you using please... I really should try to draw one... but the time...

now my main concern is about the lack of I2S uf-l just cause I'm lazy and also the jumpers between the dac chips and the front-end, mainly cause the soldering problems that are more harmfull that one believes imo.
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Old 11th January 2021, 02:26 PM   #1292
miro1360 is online now miro1360  Europe
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>> is it not to close of the fragile Lrck input ???
Digital portion is not so sensitive

>> have you considered ......
I would like to see someone creating a similar replica of this DAC, but on his own path - Road 861
I used Autodesk Eagle ... such a hobby toy

>> now my main concern is ....
"My recommendation: Start cheap and continue with improvements later."
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Old 11th January 2021, 02:33 PM   #1293
diyiggy is offline diyiggy
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so no problem really with the ground of the close I2S ground and the one of the 5V ? Really ?
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Old 11th January 2021, 02:48 PM   #1294
miro1360 is online now miro1360  Europe
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Pin 5 LRCK return path will follow its trace to DAC chips (the return path is the solid GND right under the trace).
Pin 6 GND is return path to an LRCK source.
... how do you see it?
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Old 11th January 2021, 02:56 PM   #1295
diyiggy is offline diyiggy
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hard to see with multiple layers design and bad eyes : so the two grounds (5V and I2S) are not shared close their gnd vias ? (it was what worried me but maybe it should not).


I remember also a Ti note about a neutral filer copper trace (not grounded) between two HF ground for avoiding lateral bouncing... while I don't know if it matters here. Example : Signal Ground Neutral then SGN then SGN in the illustration of an I2S signal (in fact to avoid lateral bouncing of two active lines on the same ground line. I assume a spacing to avoid that as well, hence my worry about seing a so close 5V signal & ground
I just should avoid two close such different grounded signals if it were sharing the same reference but it's certainly not tied on the same ground plane as you talk of underneath return path ?


It's also illustrate why I don't like 3D jumpers for HF signals (plus the soldering that is never good even on analog signals). Again 'm suspicious but perhaps it doesn't harm ?
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Old 11th January 2021, 03:00 PM   #1296
manniraj is offline manniraj  India
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Quote:
Originally Posted by miro1360 View Post
It is voltage output pin, you can feed additional digital circuitry from it.
Whats the max current supported by this +5vdc output from the dac board? Can we use it to power another input dac board like coaxial/spdif to I2s output?

Thanks
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Old 11th January 2021, 03:03 PM   #1297
diyiggy is offline diyiggy
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Ground loops ?
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Old 11th January 2021, 04:01 PM   #1298
miro1360 is online now miro1360  Europe
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this GND is enough ... maybe the simulation would show more .. only a small flat solder joint can be forgiven in the HF

@manniraj I would say 500mA without harming anything
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Old 11th January 2021, 04:31 PM   #1299
Vunce is offline Vunce  United States
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DAC AD1862: Almost THT, I2S input, NOS, R-2R
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Originally Posted by miro1360 View Post
@manniraj I would say 500mA without harming anything
Wouldn’t the usable current be dictated by the psu powering the Dac board?
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Old 11th January 2021, 04:35 PM   #1300
miro1360 is online now miro1360  Europe
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Yes it will be, moreover the trace width is considered
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