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Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter
Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter
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Old 1st November 2012, 02:13 PM   #1391
bigpandahk is offline bigpandahk  Hong Kong
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Quote:
Originally Posted by iancanada View Post
You mean you have already ordered the I2C isolator? I usually receive digikey orders in two days.

Please confirm the datasheet with the PCB footprint, I didnt do it.

Ian
Yes, I ordered the I2C isolator. As digikey require $100 order for free delivery, I had to order it from RS. Hope receive it early next week.
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Old 1st November 2012, 02:19 PM   #1392
bigpandahk is offline bigpandahk  Hong Kong
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Quote:
Originally Posted by syklab View Post
Hi,
Which isolator are you planing to use for I2C ?
SI8605AD-B-IS

Please see post #1331
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Old 1st November 2012, 02:52 PM   #1393
koldby is offline koldby  Denmark
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Quote:
Originally Posted by qusp View Post
it will work yes, but I think its a better idea to use the isolator on the fifo
Ups guess I have scimmed this thread too quickly..
Is there an isolator on the FIFO board?
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Old 1st November 2012, 03:17 PM   #1394
qusp is offline qusp  Australia
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no, not on the board, but in lightning quick response to a suggestion, Ian whipped up this separate isolator, which doesnt just isolate USB, it isolates everything. its placed between the fifo main board and the reclock board, so everything including the fifo CPU itself is isolated immediately before the reclocking process, a much better idea if I do say so myself =) placed here it makes it so the reclock board and clock become part of the dac, not part of your source.

at this stage only the prototypes have been sent out to testing after Ian verified it himself, in fact pretty much the last 20 pages have been about the battery board, Si570 clock board interest list and the isolator.

so its not available for purchase just yet, not till we've finished our testing, but I feel confident it will be standard issue for most people from now on.
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Old 1st November 2012, 03:29 PM   #1395
iancanada is offline iancanada  Canada
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Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter
Quote:
Originally Posted by syklab View Post
Hi,
Which isolator are you planing to use for I2C ?
Quote:
Originally Posted by bigpandahk View Post
SI8605AD-B-IS

Please see post #1331
Yes,
SI8605AC-B-IS1, 336-2052-5-ND is the one chip solution which providing both I2C isolation and full duplex serial port isolation. It fit the reserved footprint on the isolator board PCB.
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Old 1st November 2012, 03:37 PM   #1396
iancanada is offline iancanada  Canada
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Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter
Quote:
Originally Posted by bigpandahk View Post
Yes, I ordered the I2C isolator. As digikey require $100 order for free delivery, I had to order it from RS. Hope receive it early next week.
That's unfair. I need ordering more than $200- to get the free shipping .
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Old 1st November 2012, 03:46 PM   #1397
syklab is offline syklab  United States
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Element14 only require 200HK$ min order for free shipping but they don't carry any SI isolator.
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Old 1st November 2012, 06:53 PM   #1398
ggking7 is offline ggking7  United States
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Quote:
What about this configuration:
USB isolator (ADuM4160 USB Isolator board by Circuits@Home [CAH-ASSY-UI] - 44,90*€ : lipoly.de, Alles für den Elektromodellflug.) - to - USB to I2S Audio Widget (Q N K T C USB-I2S Module and Analog Board) - to - I2S FIFO - to - DAC
I believe that isolator uses a switching regulator. Here is an alternative with a linear reg:

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That said, I noticed an "unlivening" of the sound when using it that was confirmed by a well-known DAC designer. It did seem to cut PC noise though, with a blacker background and less brightness.
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Old 3rd November 2012, 03:54 AM   #1399
iancanada is offline iancanada  Canada
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Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter
Default Assemble Si8605AD I2C/USART digital isolator to the FIFO isolator board

Si8605 arrived yesterday. I assembled it to the isolator board. It will work for ESS9018 with external controller. Just fit the reserved PCB footprint on the FIFO isolator board. Pull up resistors might be required for the I2C bus on both sides.

Digikey P/N: 336-2053-5-ND

Ian
Attached Images
File Type: jpg Si8605.JPG (211.5 KB, 430 views)
File Type: jpg I2Cisloator1.JPG (583.5 KB, 422 views)
File Type: jpg I2Cisloator2.JPG (477.4 KB, 414 views)
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Old 3rd November 2012, 06:48 AM   #1400
coolhead is offline coolhead  Malaysia
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Quote:
Originally Posted by iancanada View Post
Si8605 arrived yesterday. I assembled it to the isolator board. It will work for ESS9018 with external controller. Just fit the reserved PCB footprint on the FIFO isolator board. Pull up resistors might be required for the I2C bus on both sides.

Digikey P/N: 336-2053-5-ND

Ian
Ian, it Looks beautiful.
I couldn't keep up with your update, I think that is a good sign for lazy people like me to keep reading.

I received your power management board, I just want to confirm the resistors to make sure I didn't do a silly mistake:
1. R1, 2, 5, 6, 8, 10 are 0ohm
2. R11 is 100ohm
3. R3, 4, 7, 9 are 1kohm
4. R12, 13 are short because my -ve is Gnd

Thanks.
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