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Best spec ADC Chip currently.... ??
- Thread starter SoZo
- Start date
IVX
Major Contributor
I've no idea what exactly was wrong in my handmade samples I sent Archimago and others but the first 20pcs of SMT production PCBA ES9822Pro 3rd harmonic compensated down to -140-145db. All 20pcs show [email protected] THD 0.00002% i.e. .2PPM. Handmade samples had -133-135db THD .3PPM, anyhow need to investigate the reason of that. I suspect some passive parts, perhaps MLCC. As it is common for ESS the SNR/DR isn't Unit2Unit consistent, a mono mode SNR 128db(A) and higher, noticeable less than 50% of units. Most units within the range 127+/-1db(A), about 10% <126db(A). Will test 100pcs to get finer characterization and group units by grades A, B, and C. I've found the new king between these 20 units, DR 129db(A) THD .2PPM, so far call it grade-0
Left/Right SNR is also quite different sometimes, once I saw 125/122db(A). We can imagine how high may be that difference for the ES9842, because ES9822 uses (ADC1+ADC3)/2 =Left and (ADC2+ADC4)/2 =Right.
IVX
Major Contributor
I keep working on the calibration of units. Next, the assembling will take a couple of days and ADC will be available on the Aliexpres.
IVX
Major Contributor
that is great news!
I assume the adc will be clock master in that situation?
And will it be nessecary to cut traces/ modify traces on the pcb for this use, or can it be used in parallel with the usb output?
Much thanks for all your efforts, you are really doing something special!
I assume the adc will be clock master in that situation?
And will it be nessecary to cut traces/ modify traces on the pcb for this use, or can it be used in parallel with the usb output?
Much thanks for all your efforts, you are really doing something special!
IVX
Major Contributor
ADC is master, don't need to cut traces. I'm the normal one, just products are special 
Here's the clock you need for audiophiles!
www.electronicdesign.com
Chip-Scale Atomic Clock Mounts on a PCB, Delivers Greatly Enhanced Performance
Developed by Microchip, the 1.6- × 1.39- × 0.45-in. atomic clock boosts timing precision for defense and aerospace applications such as GPS receivers and backpack radios.
www.electronicdesign.com
With a price appropriate for audiophiles.Here's the clock you need for audiophiles!
Chip-Scale Atomic Clock Mounts on a PCB, Delivers Greatly Enhanced Performance
Developed by Microchip, the 1.6- × 1.39- × 0.45-in. atomic clock boosts timing precision for defense and aerospace applications such as GPS receivers and backpack radios.
Here's the clock you need for audiophiles!
Chip-Scale Atomic Clock Mounts on a PCB, Delivers Greatly Enhanced Performance
Developed by Microchip, the 1.6- × 1.39- × 0.45-in. atomic clock boosts timing precision for defense and aerospace applications such as GPS receivers and backpack radios.
Really, as PN even most worst as a crappy penny oscillator O
1 Hz <–44 dBc/Hz
10 Hz <–64 dBc/Hz
100 Hz <–110 dBc/Hz
1 kHz <–128 dBc/Hz
10 kHz <–135 dBc/Hz
100 kHz <–140 dBc/Hz
Different horses for different courses. Not intended for the same applications.Really, as PN even most worst as a crappy penny oscillator O
1 Hz <–44 dBc/Hz
10 Hz <–64 dBc/Hz
100 Hz <–110 dBc/Hz
1 kHz <–128 dBc/Hz
10 kHz <–135 dBc/Hz
100 kHz <–140 dBc/Hz
Attachments
Phase noise sort of sucks, but the draw is "atomic" and "expensive". Technical excellence in specifications, with the possible exception of build quality, does not often seem to be an audiophile marketing prerequisite.
IVX
Major Contributor
The new king of DR sample(129.2db(A) mono) measured for THD+N and almost reached -125db or 0.000057%! )) Bare THD does not mention anymore(something like .1PPM but this is due to the DACs 3rd harmonic compensation)
@IVX
It may be a proposal that was too late.
In my understanding, it looks like a Y para cable is needed for monaural mode.
Therefore, it would be nice if there was a changeover switch for monaural mode.
If adding a switch is a problem, I'm okay with the method of shorting the board jumper pins.
The Y paracable is a bit annoying to me, so if I don't need it I'll be saved.
What do you think?
It may be a proposal that was too late.
In my understanding, it looks like a Y para cable is needed for monaural mode.
Therefore, it would be nice if there was a changeover switch for monaural mode.
If adding a switch is a problem, I'm okay with the method of shorting the board jumper pins.
The Y paracable is a bit annoying to me, so if I don't need it I'll be saved.
What do you think?
IVX
Major Contributor
I finished a simple description today and already started selling with Paypal. BTW, all people asked the only grade-A, which quickly finishing ))
e1dashz.wixsite.com
Cosmos ADC | index
IVX
Major Contributor
not yet, SMT factory busy + some vacations coming, so I've got only 20pcs PCBA so far and calibrated that for sale.
Grooved
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IVX
Major Contributor
We still have grade-B ADCs, and probably A as well, better to ask Sunny, she handles sales.
