E1DA Cosmos ADC

[IVX]

I really won't split DM for 5 grades(BB, BA, AA, A0, 00), rather I'll go with 3 grades again. Then ADC DM sample with Lch 128.0db(A) and Rch 127.4db(A), MONO is 130.7db(A) should get grade B.

 

[CedarX]

I really won't split DM for 5 grades(BB, BA, AA, A0, 00), rather I'll go with 3 grades again. Then ADC DM sample with Lch 128.0db(A) and Rch 127.4db(A), MONO is 130.7db(A) should get grade B.

So, you’ll sort & combine the chips that way:
BB, BA, AB > B
AA, A0, 0A > A
00 > 0

You won’t do B0/0B, correct?

 

[IVX]

I guess, I'll do such rework only for 0B-> 00 grade, it is too difficult to recombine factory-soldered chips. AB I'll keep as is and grade it as B, 0A keep as A.

 

[johny_2000]

I'm ready to investigate that one more year, but my boss, Sunny, is pushing me to finish the design.

How is work on this project progressing? Do you still plan to release the Dual Mono ADC for sale? Will the device be designed in the style of the ADCiso—that is, featuring galvanic isolation? And will it house two ESS ADC chips operating with their channels connected in parallel?

 

[IVX]

buying parts.

 

[IVX]

I prepared a new experimental CosmosADCiso_V15 FW with DC bias control, however, TweakCosmosADC.exe is also a new one. If anyone would like to test, welcome to our Discord.

 

[johny_2000]

I prepared a new experimental CosmosADCiso_V15 FW with DC bias control, however, TweakCosmosADC.exe is also a new one. If anyone would like to test, welcome to our Discord.

Could you explain in a few words what this DC bias control does, and how it can benefit users?

 

[IVX]

Could you explain in a few words what this DC bias control does, and how it can benefit users?

Actually, I did https://www.audiosciencereview.com/forum/index.php?threads/e1da-cosmos-adc.27038/post-2597850
Personally, I don't care about -90dbfs DC, but some users keep asking to fix that DC bias.

 

[johny_2000]

Actually, I did https://www.audiosciencereview.com/forum/index.php?threads/e1da-cosmos-adc.27038/post-2597850
Personally, I don't care about -90dbfs DC, but some users keep asking to fix that DC bias.

Okay, thanks.
How can this be useful for measurements?

 

[IVX]

It is not good or bad for measurements, just picky users like to see -120db DC. It would be easy, but I don't like to add an HPF DSP as well.

 

[IVX]

I prepared the print under the sensitivity switch(top 4 are same as ADCiso, the second group of 4 sensitivities are low-noise). IMO, it is clear, but if you have some idea about how to make it more intuitive, welcome.

 

[Roland68]

I prepared the print under the sensitivity switch(top 4 are same as ADCiso, the second group of 4 sensitivities are low-noise). IMO, it is clear, but if you have some idea about how to make it more intuitive, welcome.

View attachment 538512

I would put it in a table and, most importantly, align it vertically.

 

[IVX]

I would like to keep a visual correspondence of the switch sensitivity pattern against voltages/impedances. Furthermore, Cosmos ADC and Cosmos ADCiso have a similar marking, so Cosmos ADC DM should use its family style.

 

[IVX]

 

[capslock]

I'm late to the party, so maybe this was discussed before: what is the use case for DM? The improvements in noise and distortion are highly welcome but could have been implemented with a single ADC in mono mode. I just can't figure where I would need DM for measurements. For recording audio, of course, the use case is evident, but how common is that in your customer base?

 

[IVX]

I have no idea why our users are asking for that. Cosmos ADCiso is sold out completely, and I had to choose between ordering the same ADC again or an improved version instead(9823 is still not available). DM(Dual Mono) contains two ES9822, each in MONO mode, hence, Cosmos ADC/ADCiso is 3db noisier.

 

[morillon]

Differences with "iso" in input impedances ?
;-)
(When is it expected to be available? ;-) )

 

[IVX]

Differences with "iso" in input impedances ?
;-)
(When is it expected to be available? ;-) )

Now we have 2 groups of sensitivity. Red is nearly the same as Cosmos ADC/ADCiso, Green is low-noise(about .5db difference).
BTW, the switch pattern is corrected:

 

[NTTY]

I prepared the print under the sensitivity switch(top 4 are same as ADCiso, the second group of 4 sensitivities are low-noise). IMO, it is clear, but if you have some idea about how to make it more intuitive, welcome.

View attachment 538704

Works for me

 

[IVX]

DM's frontend looks like this: