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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 22nd August 2015, 11:50 AM   #3701
aive is offline aive  Australia
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Hey Ian, I think I'll receive the FIFO early next week (very excited!) but I have a couple of quick questions - Do I need to worry about termination resistors at my DAC for the I2S signal terminations?

My DAC has 2 x I2S inputs on its main board, via 5-pin JST connectors. I think only one of these connectors has 75 ohm termination resistors and the other does not. Photo below.

Also, I'll need to terminate the MCLK signal into the connector at the DAC - Do you see any issues with me cutting the 6" U.FL coaxial cable coax to the same length as the 4 double-ended PH 2.0 mm 7-pin I2S bridge cable and terminating it with a JST crimp lug?

Thanks Ian.

IMG_7433.jpg
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Old 22nd August 2015, 03:08 PM   #3702
iancanada is offline iancanada  Canada
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Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter
Quote:
Originally Posted by aive View Post
Hey Ian, I think I'll receive the FIFO early next week (very excited!) but I have a couple of quick questions - Do I need to worry about termination resistors at my DAC for the I2S signal terminations?

My DAC has 2 x I2S inputs on its main board, via 5-pin JST connectors. I think only one of these connectors has 75 ohm termination resistors and the other does not. Photo below.

Also, I'll need to terminate the MCLK signal into the connector at the DAC - Do you see any issues with me cutting the 6" U.FL coaxial cable coax to the same length as the 4 double-ended PH 2.0 mm 7-pin I2S bridge cable and terminating it with a JST crimp lug?

Thanks Ian.

Attachment 499830
Hi aive,

All signals from Ian FIFO KIT are already 50ohm source terminated. You don't need any termination resistor at your DAC input. Even for the MCLK signal. Please no worry at all.

After reviewing your picture, I don't think those 75ohm resistors have business with any of your I2S inputs.

Please keep in mind, don't share same signal with more than one input. Dual XO II has two groups of output. You should have enough to use.

Good weekend.
Ian
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Old 22nd August 2015, 03:17 PM   #3703
iancanada is offline iancanada  Canada
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Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter
Quote:
Originally Posted by fralippo View Post
Would someone be so kind to check if capacitor connection shown at attachment is tied to ground? I installed a SMA connector and one leg soldered with near capacitor...
It looks to be ground, so I'd prefer not to remove tin, but I need to be 100% sure!
Hi fralippo,

Yes you are right, the terminal of that MLCC was grounded. So, no worry, just go ahead with it.

I got your email, I thought, but actually I forgot replying, I'm sorry .

Good luck to your project.
Ian
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Old 22nd August 2015, 03:54 PM   #3704
aive is offline aive  Australia
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Thanks Ian, wise words as usual
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Old 23rd August 2015, 10:38 PM   #3705
iancanada is offline iancanada  Canada
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Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter
Default Free Raspberry Pi I2S cap PCBs are ready, please send message with your address

Hi guys,

Free Raspberry Pi I2S cap adapter PCBs are now ready. I have 30 of them in total. I hope that will be enough. If more people want it, Ill consider making more down the road.

1. If you just want the free Raspberry Pi I2S cap PCB, you only need to send a diyAudio message to me with your shipping address. You will soon receive the PCB in an envelope. The BOM and part numbers are all in the schematics I attached at end of this post.

2. If your want the free Raspberry Pi I2S cap PCB together with SMT connector package or something else, you also need to send me a diyAudio message by following an order form to iancanada.mail@gmail.com. I'll follow up with a PP invoice with the lowest possible shipping to suit you best (there will be no tracking number unless you need it). The order form can also be downloaded at end of this post.

I will create a list based on the order of when I get your message. It will be stopped once all PCBs are run out.

Please note there is a small mistake on the PCB silkscreen: label of 5V and GND were revised. Just label I promise .

Im very happy to share this small toy with you all, have fun!

Click the image to open in full size.
FreeRaspBerryPiI2Scap by Ian, on Flickr

Click the image to open in full size.
SMTconnectorPackage by Ian, on Flickr


Ian
Attached Files
File Type: zip PRiI2ScapOrderFormEmpty.zip (7.2 KB, 95 views)
File Type: pdf PiI2SAdapterSchematic.pdf (10.9 KB, 138 views)
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Old 23rd August 2015, 10:41 PM   #3706
Zoef is offline Zoef  Netherlands
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Pm sent ;-)
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Old 23rd August 2015, 10:46 PM   #3707
marcus1 is offline marcus1
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Quote:
Originally Posted by Zoef View Post
Pm sent ;-)
+1

Thanks Ian!
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Old 24th August 2015, 07:34 PM   #3708
MadKid is offline MadKid  Hong Kong
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PM Sent

Thanks Ian!
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Old 24th August 2015, 09:23 PM   #3709
nedi is offline nedi  Norway
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PM sent

Thanks Ian !
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Old 24th August 2015, 09:57 PM   #3710
Malvin is offline Malvin  United States
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PM sent.
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