UltraAnalog D20400 DATA ! I have it all !!

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#41
 
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#42
#44
is there any source where I can get replacement for D20400 ? I mean new boards for PCM63 / PCM1702 / PCM1704 or AD1862 ? There are a few photos of these boards here, but where to get/order them? I found PCX with AD1862 only, nothing else...
 
#46
From SF Processor 3

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#49
Jon Lord said:
According to my list the DAC0013 was a modified version of the early D20400 customized for the early VTL and Manley Reference DACs. There could be some minor differences regarding output stage gain, but I would expect, it to be pin compatible to D20400/A.

D20400 can run in most D20400A circuits and vice versa, but there seems to be some minor incompatibility. The most annoying one, ist that D20400A has rectangular pins and D20400 has thin round precision pins, which means, that both can't work in the same type of socket.

Most variants (like the DAC0013) have an internal deglitcher, which should be used, otherwise the glitches will increase the distortion dramatically.
The HOLD input can be connected to the DG outputs of classic NPC and PMD digital filters (Unfortunately DF1704/DF1706 don't have it).
If you don't have a DG/HOLD signal available, you could use the Wordclock of the DAC. One option would be to delay all signals to the dac by at least one clock cycle (e.g. HC574) and using the original undelayed wordclock as HOLD (beware of polarity). If the Wordclock has a 50% dutycycle, it could work.

The HOLD is the most critical digital signal and should provide the lowest jitter of any signal. One can achieve this e.g. by reclocking it by the MCLK signal or any other low jitter clock.

From what I know only the DAC0018 (Spectral SDR-2000) and P/N 340022 (Sonic Frontiers Processor 3, DAC0022 ??) variants don't come with internal deglitcher, but need an external one instead.

You can't properly use any of the D20400 variants without a deglitcher !
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according the comment from a french member under
https://forum-hifi.fr/thread-12902.html
and post #21 under
D

Post in thread 'Latest production of D20400PLUS module'

Hello from France,
Excuse me, please. I'm using Google Translate.
I'm familiar with this topic. A friend and I are working on these D20400plus chips.There's a thread on a French forum that I'm contributing to.
https://forum-hifi.fr/thread-12902-page-14.html
We are in contact with the D20400plus developer regarding the development of the D20400plus
.Do you have any questions?
Greetings, your French HiFi friend.
in the "a" version the used OP-amps (like AD844) operates with +/-5VDC and in the version without "a" with +/-10VDC, which provide better sound; -
go to post #9 under
https://www.analog-forum.de/wbboard...le-d20400a-d20400/&postID=3030910#post3030910
 
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