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Old 30th March 2013, 10:53 PM   #521
acko is offline acko  Australia
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Default Clock Update-AKX302

Quote:
Originally Posted by hochopeper View Post

Ian'sTPS74A4700

In terms of availability, it is really only available whenever Ian runs a GB, so I'm not sure if I would describe it as 'readily available' though I can't see Ian having a huge objection to someone replicating the PCB since it is relatively simple. A similar circuit could be made on board though the QFN package reg chip isn't as simple (though it certainly is possible) to solder with conventional soldering iron so might not be ideal as the 'default' but it does represent a significant step up in performance over the ADP150.

Added LT6655 based Reg cct on-board (U1, "MSOP8") instead for the AKX302. So several options now:
1. ADP150 LDO cct (on-board) 9uV noise
2. LT6655 Reg cct (on-board) 1uV noise
3. 3-Term Reg mounting point and space for Ian's tps7a4700 (4.8uV noise), Hynes or TPA Trident shunts (?? noise).
4. External 3.3V LiFePO4 bat (J2)
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Last edited by acko; 30th March 2013 at 11:03 PM.
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Old 31st March 2013, 03:29 AM   #522
qusp is offline qusp  Australia
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Q1 is a buffer transistor for U1?
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Old 31st March 2013, 03:37 AM   #523
Can you say Audio?
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Very nice Acko - I love how this little board is developing. Very flexible.
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Old 31st March 2013, 06:52 PM   #524
acko is offline acko  Australia
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Quote:
Originally Posted by qusp View Post
Q1 is a buffer transistor for U1?
Yes


Quote:
Originally Posted by MisterRogers View Post
Very nice Acko - I love how this little board is developing. Very flexible.
Thanks. More updates to come!
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Old 2nd April 2013, 01:37 AM   #525
bk856er is offline bk856er  United States
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Are other USA folks still waiting on their GB isolator boards?

BK
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Old 2nd April 2013, 06:53 AM   #526
grufti is offline grufti  United States
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I got mine about two weeks ago. This is from the first round to CA.
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Old 3rd April 2013, 05:54 AM   #527
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Thanks acko, the board looks great! Got them two weeks ago... was in holiday.

Markus
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Old 3rd April 2013, 11:22 AM   #528
acko is offline acko  Australia
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Default Clock Update-AKX302

Quote:
Originally Posted by acko View Post
Added LT6655 based Reg cct on-board (U1, "MSOP8") instead for the AKX302. So several options now:
1. ADP150 LDO cct (on-board) 9uV noise
2. LT6655 Reg cct (on-board) 1uV noise
3. 3-Term Reg mounting point and space for Ian's tps7a4700 (4.8uV noise), Hynes or TPA Trident shunts (?? noise).
4. External 3.3V LiFePO4 bat (J2)
Dual XO upgrade with Full Synchronous Clocking capability
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File Type: png AKX302Prev.png (43.5 KB, 463 views)
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Old 3rd April 2013, 11:40 AM   #529
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That looks like there is enough options to keep everyone experimenting for quite some time Acko!


To keep info on CKSEL logic together here is the quote from Domenico on the Amanero's clock selection logic quoted from the other thread:

Quote:
Originally Posted by amanero View Post
MCLK Input is working but it needs a new firmware for the cpld i haven't yet adapted for download. I think to put online the new cpld firmware soon.

When you check MCLK Input, the cpld works in slave mode and it accepts the clock from pin7. Pin1 and Pin11 are used for clock selection.
Which clock Pin1 and Pin11 each select isn't evident from posts on that thread yet but hopefully will become obvious when that firmware is made available.
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Old 3rd April 2013, 03:58 PM   #530
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The Clock's really coming along nicely Acko. When do you anticipate freezing it?
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