Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter - Page 63 - diyAudio
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Old 5th June 2012, 07:34 AM   #621
qusp is offline qusp  Australia
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well I think Ian tested both but decided to go with easier and guaranteed availability
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Old 5th June 2012, 08:17 AM   #622
zinsula is offline zinsula  Switzerland
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Demian doesn't think they do not meet the spec: Here his post
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Old 5th June 2012, 08:23 AM   #623
qusp is offline qusp  Australia
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yeah I thought I had seen Demian mention they were up to snuff, the article mentioned above is much more likely to be rumor-mongering by the large competitors who are possibly embarrassed that such a small start up has them beat so convincingly
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Old 5th June 2012, 10:55 AM   #624
vzs is offline vzs  Europe
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Quote:
Originally Posted by qusp View Post
2 I think, with termination on the input, well I cant advise on 3 or 1as I have no experience with them, though 1 sounds interesting, I would worry about linearity, but i'm a bit of a 'worry wart'
Thanks, I will try with PO74G125A(126A). By input termination you mean a 50ohm resistance in parallel with each input?
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Old 5th June 2012, 12:02 PM   #625
qusp is offline qusp  Australia
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50R to ground just before the input, provided theres no other termination beforehand. check the potato datasheet, I would think this application would be covered, or just steal a scheme from Ti. as I thought, the datasheet test circuit for PO74G125A includes 50ohms to ground after the pulse generator directly before the input, I presume the same applies here.

i'm not the expert in this area, Ian got an opinion? .

Last edited by qusp; 5th June 2012 at 12:10 PM. Reason: checked back to double check both were i2s source
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Old 5th June 2012, 12:11 PM   #626
PET-240 is offline PET-240  Australia
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Quick sorta OT,

For output from the FIFO, not integrated on the board, I'm looking to drive 16 x TDA1543. This is looking around the 20-25mA to be covered at the 5V logic voltage. I have the schematic from the des
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Old 5th June 2012, 12:11 PM   #627
PET-240 is offline PET-240  Australia
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.....igner, so I remember a 74HC s
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Old 5th June 2012, 12:13 PM   #628
PET-240 is offline PET-240  Australia
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.omething or other, the iPhone is not the best device to reply on apparently.....

Anyway, what is best in your opinion to do this please?

Thanks,

Drew.
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Old 8th June 2012, 04:08 AM   #629
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Originally Posted by vzs View Post
Thanks, I will try with PO74G125A(126A). By input termination you mean a 50ohm resistance in parallel with each input?
I found this circuit board but there's no information on the "OverKill Audio" Website. Quite similar to yours idea, very simple circuit but without any impedance matching resistor at the in/output. The components are very cheap, will give it a try.
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Old 8th June 2012, 08:56 AM   #630
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Originally Posted by bigpandahk View Post
I found this circuit board but there's no information on the "OverKill Audio" Website. Quite similar to yours idea, very simple circuit but without any impedance matching resistor at the in/output. The components are very cheap, will give it a try.
I dont see any buffer. btw, Overkill owner posts here and i have his email somewhere.
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