ES9022 chip but Nuforce seem to have scratched the ID off the chip AFAIK Have a search in this thread http://www.head-fi.org/forums/f7/fi...-udac-usb-dac-amp-line-out-s-pdif-out-456945/
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How's SNR and DNR different? That just doesnt add up. Looks like the DA part has worse thd than the builtin opamp, similar opa365 has thd in ppm range.
EDIT: 98SNR because of the 16/44 usb codec ? -ridicoulus.
- at least they should reveal a level vs thd plot .
EDIT: 98SNR because of the 16/44 usb codec ? -ridicoulus.
- at least they should reveal a level vs thd plot .
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Someone tested a ES9022 modules from me and here is what he has to say :
http://www.diyaudio.com/forums/digi...card-16-44-1-wav-transport-3.html#post2167975
Patrick
http://www.diyaudio.com/forums/digi...card-16-44-1-wav-transport-3.html#post2167975
Patrick
Finally got my finger out, and had a listen to this 9022 dac on a little pcb I made...
I read about the 50Mhz local XO for the 9022 the day after I sent the files off for pcb manufacturing, currently using the 12Mhz from the receiver.
I'm using spdif in as I have plenty of spdif sources, using a wm8804 as the receiver.
Excuse the mess on the PCB, I had a duff 8804 initially. Using a simple 3v3 reg for the three 3v3 lines (two for the 8804, one for the 9022)
Very pleasant sound, and driving headphones directly, which is a surprise!
This is the first circuit I've designed myself from scratch, so quite pleased that it works!
An externally hosted image should be here but it was not working when we last tested it.
I read about the 50Mhz local XO for the 9022 the day after I sent the files off for pcb manufacturing, currently using the 12Mhz from the receiver.
I'm using spdif in as I have plenty of spdif sources, using a wm8804 as the receiver.
Excuse the mess on the PCB, I had a duff 8804 initially. Using a simple 3v3 reg for the three 3v3 lines (two for the 8804, one for the 9022)
Very pleasant sound, and driving headphones directly, which is a surprise!
This is the first circuit I've designed myself from scratch, so quite pleased that it works!
Standard ES9022 Modules
To ease the hunger of the waiting crowd, here are some latest pictures.
Shown here 2 standard modules with 50MHz low jitter XOs, separate LT1761 regulators, Murata MLCC capacitors, Susumu thin film SMD resistors, ultra-low ESR conductive polymer eletrolytics, and WIMA FKP2 output filtering caps .......
Patrick
To ease the hunger of the waiting crowd, here are some latest pictures.
Shown here 2 standard modules with 50MHz low jitter XOs, separate LT1761 regulators, Murata MLCC capacitors, Susumu thin film SMD resistors, ultra-low ESR conductive polymer eletrolytics, and WIMA FKP2 output filtering caps .......
Patrick
Attachments
ES9022 in Synchronuous Mode
An advanced version of the ES9022 module using a 45.1584MHz XO and 2 ultra-fast single-gate Flip-Flops on a daughter board for dividing down to 11.2896MHz (to replace the TCXO in the QA550).
Patrick
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An advanced version of the ES9022 module using a 45.1584MHz XO and 2 ultra-fast single-gate Flip-Flops on a daughter board for dividing down to 11.2896MHz (to replace the TCXO in the QA550).
Patrick
.
Attachments
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lovely neat work as usual Patrick, I would be interested in one of these perhaps to run the sub channel for my 3 ways. nice and neat and small, so could be easily built into the amp. that or ackos AKD24 using the same chip. which isnt quite as small though
am I right in assuming these are designed to slot into the SD reader? so with external battery pack you could have full blown portable solution with headphone amp given something to buffer/drive the output?
am I right in assuming these are designed to slot into the SD reader? so with external battery pack you could have full blown portable solution with headphone amp given something to buffer/drive the output?
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ES9022 Balanced
Yet another advanced version using a second level PCB with the 2nd ES9022 fed with inverted data from a single gate 741G04 (with its own LT1761 PSU).
The WIMA FKPs are soldered directly on the pins of the XLR connector.
Patrick
Yet another advanced version using a second level PCB with the 2nd ES9022 fed with inverted data from a single gate 741G04 (with its own LT1761 PSU).
The WIMA FKPs are soldered directly on the pins of the XLR connector.
Patrick
Attachments
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