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Old 16th November 2012, 02:15 PM   #1511
Nikitas is offline Nikitas  Greece
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Join Date: Nov 2011
Location: Amsterdam
Si570 interest list:

1. bigpandahk
2. tagheuer
3. hochopeper
4. qusp (of course)
5. AR2 - definitely!
6. wktk_smile
7. hirez69
8. CeeVee - you bet!
9. number9
10. analog_sa - GB maniac
11. edbk
12. atom6422
13. misterrogers - Of Course!
14. NicMac - as usual!
15. Zoran 16. PET-240
17. Coolhead
18. Slartibartfasst
19. SYklab
20. Regland
21. Neb001
22. SPWONG
23. Greg Stewart (also of course!)
24. Vitalica
25. spm
26. Fridrik
27. ccliu
28. makumba1966
29. lindamar
30. Finaxe
31. Odysseas x2
32. palmito
33. crazikid

Updated me request for one extra board.
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Old 19th November 2012, 01:26 AM   #1512
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Join Date: Dec 2009
Location: Toronto
Default Si570 clock board V2.0 is running

I start testing the Si570 V2.0 board today.

Now, it can generate eight audio frequencies for different application: 98.xxx, 90.xxx, 49.xxx, 45.xxx, 24.xxx, 22.xxx, 12.xxx, 11.xxx. U.fl footprints of additional group of I2S output placed at back of the PCB especially for dual mono configuration. As well as a pair of MCLK output sockets on top. An optional un-terminated MCLK output u.fl socket footprint placed at back. The un-terminated MCLK signal is expected has short raising time and less delay, but has to use very short cable. Three u.fl footprints for I2S input left on the back of the PCB. Optional customized decoupling cap foot prints left at back of PCB too.

Because of the special requirement on power supply, from PCB V2.0 of Si570 clock board, a three pin external reg socket has been included on PCB for customized low noise power supply. Because of this, I even didn't mount the onboard LDO, I don't think ADP151 could still keep low noise performance at output current more than 100mA.

There are two options for powering the Si570 clock board. One option is using an external low noise reg such as TPS7A4700. The other option is using a LiFePO4 battery cell directly.

For the first option, I use the TPS7A4700 reg board which I built yesterday. Just simply plug it into the three pin socket of the si570 pcb. Any kind of 4-6.5V DC input works for it. However battery based DC input still preferred. I use 6V battery pack for todayís test (battery management board required of cause). Third party regs also work for this option, such as Salas shunt reg, TP trident and etc. But I did try any of them yet.

For the second option, you need short the input and output pin of the reg socket by a jumper and powering the DC input from a LiFePO4 battery cell, battery management board is a must in this case.

I run the si570 board at 90.xxx and 98.xxx MHz MCLK with ESS9018 working at sync mode, it sounds wonderful without any suspect.

The interesting thing Iíve noticed is that MLCC version and TAN version of TPS7A4700 sounds different. The MLCC version sound more close to the LiFePO4 battery cell. I need more time to look into this issue.

I use 74PO74 GHZ flip-flop for re-clocking the I2S at beginning. But glt mentioned that ESS9081 I2S SCK need a bit more delay to the MCLK to get better sound, so later on I will try different flip-flops with longer delay.

Please find the file names of the pictures below for more details.

Ian
Attached Images
File Type: jpg Si570ClockBoardV2.0.JPG (304.6 KB, 447 views)
File Type: jpg I2SforDualMONO.JPG (323.8 KB, 332 views)
File Type: jpg BatteryPowerConfiguration.JPG (292.2 KB, 328 views)
File Type: jpg TPS7A47RegMLCC.JPG (312.9 KB, 327 views)
File Type: jpg TPS7A47RegTAN.JPG (334.7 KB, 323 views)
File Type: jpg ThirdPartyREG.JPG (275.9 KB, 178 views)
File Type: jpg I2Su.flInput.JPG (330.1 KB, 159 views)
File Type: jpg UnterminalMCLK.JPG (298.1 KB, 143 views)
File Type: jpg TwoMCLKoutput.JPG (380.8 KB, 168 views)
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Ian GBV - I2S to PCM converter board & FIFO KIT
http://www.diyaudio.com/forums/group...ml#post3662743
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Old 19th November 2012, 06:30 AM   #1513
qusp is offline qusp  Australia
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looking great Ian! interesting point about BCK, can you not delay it with DSP? ie an alternate firmware, or jumper?
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Old 19th November 2012, 07:14 AM   #1514
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Location: Brisbane, Australia
Quote:
Originally Posted by qusp View Post
looking great Ian! interesting point about BCK, can you not delay it with DSP? ie an alternate firmware, or jumper?
It's not just any delay though, so I think Ian is using some creative license there We need the 'delay' to create a falling edge instead of rising edge in synch with the other signals.

See:

Quote:
Originally Posted by iancanada View Post
it optimized to signals synchronized with the falling edge of the MCLK.

Unfortunately the CMOS version of Si570 doesn't have a inverted output. However it could still be achieved by replace the potato 74G74 with 74AC74 to get same amount of timing relationship for the 98.xxx and 95.xxx MCLK. Will give a try to see if there is any audible difference.

Note that this change might only work for those two clock frequencies and would probably need work to get the same relationship at 45/49MHz or any other pair of MCLK freq. Though the 'ES9018 brigade' probably aren't planning on using less than the 95/98MHz frequencies, were you? Acko wrote something a few weeks ago about trying this inverted mclk in his setup didn't he?
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Old 19th November 2012, 07:52 AM   #1515
qusp is offline qusp  Australia
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Location: Brisbane, Australia
ahh yes i'm aware of the inverted trick, I just mistook him for talking of something else I hadnt heard of. I think I may have been the one that asked for it =) I think glt also mentioned it later in the thread so I didnt have to get the poking stick out...also mentioned it to Acko, aaah my brilliant minions go brainiacs go!! lol joking, its just nice to have someone so skilled that has the same goals!

yeah i'll be using 95/98

but I still wonder why the inversion couldnt be done internally before it even goes to the clock board? I thought cmos was symmetrical so an inverted signal could still be sent from the same part as the non inverted signal?

Last edited by qusp; 19th November 2012 at 07:57 AM.
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Old 19th November 2012, 09:42 AM   #1516
deanoUK is offline deanoUK  United Kingdom
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Join Date: Oct 2008
Location: Birmingham UK
Default Si570 interest list.

Quote:
Originally Posted by Odysseas View Post
Si570 interest list:

1. bigpandahk
2. tagheuer
3. hochopeper
4. qusp (of course)
5. AR2 - definitely!
6. wktk_smile
7. hirez69
8. CeeVee - you bet!
9. number9
10. analog_sa - GB maniac
11. edbk
12. atom6422
13. misterrogers - Of Course!
14. NicMac - as usual!
15. Zoran 16. PET-240
17. Coolhead
18. Slartibartfasst
19. SYklab
20. Regland
21. Neb001
22. SPWONG
23. Greg Stewart (also of course!)
24. Vitalica
25. spm
26. Fridrik
27. ccliu
28. makumba1966
29. lindamar
30. Finaxe
31. Odysseas x2
32. palmito
33. crazikid
34. deanoUK

Cheers.
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Old 19th November 2012, 09:43 AM   #1517
qusp is offline qusp  Australia
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Location: Brisbane, Australia
wheres your 'of course' deanoUK? you dont show a great deal of commitment...

hehe
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Old 19th November 2012, 09:46 AM   #1518
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Join Date: Feb 2009
Location: Brisbane, Australia
my 'you betchya' is implied simply by way of being quicker onto the list than qusp
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Old 19th November 2012, 09:50 AM   #1519
Julf is offline Julf  Europe
diyAudio Member
 
Join Date: Oct 2011
Location: Amsterdam, The Netherlands
Si570 interest list:

1. bigpandahk
2. tagheuer
3. hochopeper
4. qusp (of course)
5. AR2 - definitely!
6. wktk_smile
7. hirez69
8. CeeVee - you bet!
9. number9
10. analog_sa - GB maniac
11. edbk
12. atom6422
13. misterrogers - Of Course!
14. NicMac - as usual!
15. Zoran 16. PET-240
17. Coolhead
18. Slartibartfasst
19. SYklab
20. Regland
21. Neb001
22. SPWONG
23. Greg Stewart (also of course!)
24. Vitalica
25. spm
26. Fridrik
27. ccliu
28. makumba1966
29. lindamar
30. Finaxe
31. Odysseas x2
32. palmito
33. crazikid
34. deanoUK
35. Julf
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Old 19th November 2012, 12:54 PM   #1520
deanoUK is offline deanoUK  United Kingdom
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Join Date: Oct 2008
Location: Birmingham UK
Quote:
Originally Posted by qusp View Post
wheres your 'of course' deanoUK? you dont show a great deal of commitment...

hehe
When yow cum from brumingon cheers says it all. he he.
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