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Old 1st February 2013, 09:40 PM   #1
diyAudio Member
 
Join Date: Apr 2010
Default PT2258 - PCB

hi to all

PT2258 is 6 channel digitally volume controller IC which work I2C serial bus
and my chip amp is STK4192II and i want to make PCB for PT2258 and connect that to STK4192II
what i do to making PT2258 board without any noise?

my problem how to use power source chipamd , microprossor , PT2258 , how to distribution AGND & DGND and any more....
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Old 2nd February 2013, 01:13 AM   #2
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Join Date: Nov 2008
There are hundreds of papers discussing pcb design on these issues. Google!
The most important are: dilligint seperation of all analog supplies and digital supplies (often to the point of seperate secondary transformer windings), physical separation of a & d signal planes and proper grounding schems (think star-ground).
After all that, you will often find that, to get a really quiet board, you will need to do some (often not so minor) correction to your layout.
It is a true learning experience. Cheers, and good luck! E
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Old 2nd February 2013, 10:08 AM   #3
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Join Date: Apr 2010
i read some PDF for PCB designing but not fully help me....
if you have great article that simple explain please share for me

this is my board and designing with Protel DXP

can say to me my board defect?

Protel file:
PT2258.rar

Click the image to open in full size.
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Old 2nd February 2013, 05:38 PM   #4
marce is offline marce  United Kingdom
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Location: Blackburn, Lancs
Start here, and a few more links in the attached file.
Frequently Asked Questions
Technical Articles/Talks

Look at the ground, you have it routed and fastened to the copper pour, where the power connector in is, use the copper pour only to get maximum ground coverage (remove the routes), a ground plane and a two layer design would be much better. You also have unconnected copper areas, these would be better removed. And finaly no local decoupling at the IC's power pins is obvious?
Attached Files
File Type: txt PCBlinks.txt (5.1 KB, 10 views)

Last edited by marce; 2nd February 2013 at 05:41 PM.
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Old 4th February 2013, 05:17 AM   #5
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Join Date: Apr 2010
tank very much....

Quote:
a ground plane and a two layer design would be much better
what is your mean?

button layer would be quite ground ( fully copper ) and top layer would be routes only , it's true?

Quote:
And finaly no local decoupling at the IC's power pins is obvious?
your means is decoupling capacitor on IC's power pins?
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Old 4th February 2013, 12:42 PM   #6
marce is offline marce  United Kingdom
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Join Date: Jun 2007
Location: Blackburn, Lancs
Yes for ground plane.
Usually a 0.1uF cap next to VCC and GND pins, as close as possible.
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Old 6th February 2013, 06:27 AM   #7
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THX THX THX.....

Quote:
Yes for ground plane.
i don't understand your mean?

top layer can have ground plane?
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Old 6th February 2013, 07:25 AM   #8
marce is offline marce  United Kingdom
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Join Date: Jun 2007
Location: Blackburn, Lancs
A ground plane is a contigous (unbroken) plane of copper that allows the digital signals (and higher frequecy analogue) o have an unbroken return path underneath the signal trace (path of least inductance). A broken copper pour between tracks is copper flooding and whilst better than ground trun as traces is not a ground plane.
Some links:
http://www.x2y.com/filters/TechDay09...%20_JohnWu.pdf

http://www.hottconsultants.com/techt...gnd-plane.html

http://www.ti.com/lit/ml/slyp167/slyp167.pdf

http://www.analog.com/static/importe...es/AN-1142.pdf
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Old 9th February 2013, 08:52 PM   #9
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Join Date: Apr 2010
THX THX THX ....
NOW I UNDERSTAND....
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