DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 261 - diyAudio
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Old 18th November 2013, 02:05 PM   #2601
mllum is offline mllum  Malaysia
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Location: Kuala Lumpur
"for the usb i2s adapter, there are a few options that use asychronous operation.
diyink cm6631a - isolation"

Hello Tofurky,
I too would like to try the I2S connection between my CM6631A usb adapter and the AK4396 dac. However I am unable to figure out how to make this I2S connection.
Your kind assistance in this matter is kindly sought.
And with this arrangement would the CM6631A/AK4396 support output format 24 bit 192 khz.
Thank you very much.

Last edited by mllum; 18th November 2013 at 02:31 PM.
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Old 19th November 2013, 04:09 AM   #2602
mllum is offline mllum  Malaysia
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Hello Tofurky,
I too would like to try the I2S connection between my CM6631A usb adapter and the AK4396 dac. However I am unable to figure out how to make this I2S connection from the 5 points on the CM6631A board to the AK4396 board, including the setting of the clocks to the appropriate frequencies.
Your kind assistance in this matter is kindly sought.
And with this arrangement would the CM6631A/AK4396 combinatiom be able to support output format 24 bit 192 khz.
Thank you very much.

Last edited by mllum; 19th November 2013 at 04:12 AM.
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Old 19th November 2013, 05:01 AM   #2603
tofurky is offline tofurky  United States
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hi mllum,
i haven't yet decided on an adapter or modified the dac. however, i did check the output clocks of one cm6631a in particular (the diyinhk model) and compared them to the datasheet; all sample rates appeared to be supported, including 192khz. at least with the cm6631 (non "a" model), it only does 16bit or 32bit. i think if you send a 24bit stream, it is padded with zeros by the driver, which are then truncated by the ak4396 back to 24bit.
regarding the physical connections to the dac, the first step would be to remove the 4 resistors between the cs8416 and the ak4396.
then, ground would connect up wherever you can find it. personally i think removing the capacitor labeled C28 on the attached image would be a good way to do it. you may want to double check the image because it's untested
also attached is a schematic of the ak4393 version of the board; but i believe it's nearly identical aside from the different dac chip.
-matt

edit: i think it might just be the firmware on the cm6631 i have that shows only 16/32bit; the datasheet shows 16/24/32bit, with the spdif outputs being limited to 24bit.
Attached Images
File Type: jpg mini2496-i2s.jpg (187.6 KB, 773 views)
Attached Files
File Type: pdf Mini2496 Schematic.pdf (23.1 KB, 87 views)

Last edited by tofurky; 19th November 2013 at 05:09 AM. Reason: cm6631 bitrate
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Old 19th November 2013, 05:18 AM   #2604
mllum is offline mllum  Malaysia
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Thank you very much for this valuable information sir.
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Old 20th November 2013, 01:43 AM   #2605
Peterma is offline Peterma  Australia
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The diyinhk CM6631A usb adapter using I2S connection works, keep the links short.
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Old 21st November 2013, 05:30 AM   #2606
mllum is offline mllum  Malaysia
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Thanks Peter for affirming that.

But with what DAC does it work well and how is it connected. And also how is the clocks set to be correctly matched to output 24B192K audio between the CM6631A USB Adaptor and the DAC.

Thank you.
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Old 22nd November 2013, 07:42 AM   #2607
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Default i2S connection

this post is grate: #1531
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Old 6th December 2013, 11:03 AM   #2608
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Quote:
Originally Posted by erin View Post
DiyAudio forum does not work that way. Once a post is made the OP cant edit it. So you might have to read a couple of pages.
A bit late but I just saw this post. As a feature, only first posts should be available to editing for owner. You could see a edit button right bottom corner of first post.
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Old 10th December 2013, 07:27 PM   #2609
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Could you please check shortcut between 17 and 18 pins of AK4396.
As per datasheet for pin 17 we are able to provide separate power line.
In that case shortcut between 17 and 18 is not required but the shortcut is there.
May be the best way to delete it?

PS I found it here
myelectrons.ru/high-end-dac-za-50/
page is in Russian please use google translate.
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File Type: png short-DAC-pins.png (151.1 KB, 513 views)
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Old 18th December 2013, 03:44 AM   #2610
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Thanks for this thread, I did my version finally.
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