ESS ES9023 Sabre Premier DAC with integrated op amp - Page 3 - diyAudio
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Old 5th February 2011, 03:00 AM   #21
qusp is offline qusp  Australia
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I wasnt suggesting using those chips, just that you might look at making sure whatever the device is that is next can have its common mode input voltage lifted above ground, be it chip, fet whatever and pick the highest gM part

also I really do suggest using current mode if you can, on top of measuring better it sounds much better to my ears
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Old 7th February 2011, 12:20 AM   #22
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The 9023's outputs are ground referenced per the part's headline spec. (So are the 9022's.) It would be an unusual op amp which couldn't handle the 1.65V common mode of the other ESS DACs.

ESS's distinction between voltage and current mode is unclear. Implementing the current mode schematics with 49720s imposes a load impedance of 60k for figure 1 of the app note and 30k for figure 3. As the resistor values in the voltage mode output schematics in the 9006 and 9008 datasheets are unlabeled it's difficult to reason about how the DACs are responding to output loading. If one assumes it's a unity gain buffer workback on the noise floor suggests the resistors are a few hundred ohms. Increasing that to a more typical 1k would impose a more friendly load on the DAC and 10k probably wouldn't be a problem. For example, if one implements a low cost fully differential op amp by using a cheap dual op amp putting 10k resistors in the feedback nets results in the DAC seeing a 20k load. I would be surprised if that measured much different from figure 3 of the app note, and the figure 3 results are pretty decent.

Can you share what load impedances you have tried and how the measured performance varies between them or are you under NDA?
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Old 7th February 2011, 01:47 AM   #23
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I think you are wrong... I see 3 kohm load for the DAC output in figure 1.
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Old 9th February 2011, 02:31 AM   #24
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To the extent the op amps fail to act as buffers, yes.
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Old 19th April 2011, 05:22 PM   #25
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Default ES9023 PCB with WM8804

I made a PCB to evaluate ES9022/23 with WM8804 SPDIF. I have got the draft version (one error in the WM8804 section). The board has I2S header and separate power supply for ES9022, so the whole WM8804 section can be ignored.

I have been listening with it for few days and it sounds great.

I have got about 4 spare boards and ES9022 if someone wants to evaluate it. The PCB costed about $10 and DAC $4. Let me know if anyone want them.

-Subbu
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Old 19th April 2011, 09:15 PM   #26
EUVL is offline EUVL  Europe
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> I have been listening with it for few days and it sounds great.

Cannot agree more. But have you actually try the ES9023 ?

See also :

Anybody using the new ESS Vout DAC (ES9022)?
Finally, an affordable CD Transport: the Shigaclone story


Patrick
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Old 19th April 2011, 09:20 PM   #27
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Yes, I have tried the ES9023 but to be frank I could not tell any differences between them (atleast to my ears :-). )

-Subbu
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Old 19th April 2011, 09:23 PM   #28
EUVL is offline EUVL  Europe
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Are you running 3.6V on the 9023 ?


Patrick
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Old 19th April 2011, 11:27 PM   #29
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Nope, I haven't tried with 3.6v, will give it a try when I get home.

Subbu
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Old 20th April 2011, 07:08 PM   #30
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Default Pictures of the PCB and Completed board

Pictures of the PCB and Completed board. Smaller image shows the error in the PCB where DOUT/DIN are swapped.
Attached Images
File Type: jpg ES9022 PCB.jpg (94.7 KB, 1212 views)
File Type: jpg ES9022 Completed 2.jpg (147.3 KB, 1197 views)
File Type: jpg Error.jpg (39.1 KB, 1160 views)
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