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Old 5th September 2013, 03:50 PM   #1
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Default TDA7297 Board Layout Suggestions

Hi all,
The attached photo shows the copper side of a small TDA7297 board (about 7*7 cm). What do you think about components placement? routing?

P.S: i realize that the input signal lines (from the input capacitors to chip pins 4 and 12) are a bit long but now i am too tunnel vision so i need your extra set of eyes.

Thanks
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Old 5th September 2013, 04:47 PM   #2
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Sorry, wrong forum. Could the moderators please move this to Chip Amp section, thank you very much.
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Old 6th September 2013, 12:00 AM   #3
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Old 6th September 2013, 12:10 AM   #4
kevinkr is offline kevinkr  United States
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moved
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Old 6th September 2013, 12:50 AM   #5
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Quote:
Originally Posted by kevinkr View Post
moved
Thanks and sorry for the inconvenience.
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Old 6th September 2013, 02:14 PM   #6
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Is it fine or is it not? come on guys, every opinion matters.
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Old 6th September 2013, 02:54 PM   #7
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Quote:
Originally Posted by sghr220 View Post
Is it fine or is it not? come on guys, every opinion matters.
Not.

See how they have done it in the chips data sheet.
See how everything is routed.
Copy that basic design to your pcb software and then start improving...
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Old 6th September 2013, 03:25 PM   #8
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Thanks for the reply but allow me a few questions...

Quote:
Originally Posted by palstanturhin View Post
Not.
Care to elaborate on that as i can't see any essential differences regarding routing and ground paths.

Quote:
Originally Posted by palstanturhin View Post
See how they have done it in the chips data sheet.
The layout in the datasheet is for application circuit Fig(1) where the mute and standby signal are coming from a microprocessor off board. What i am trying to build is the simple circuit in Fig(3) so there is a slight change in the component and i also added a dual pot for volume control. Aside from that what exactly do you see that could be a potential problem?
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Old 6th September 2013, 03:57 PM   #9
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Somehow separate the power ground from the audio ground, then connect them together in one point. Also saparate the chips power ground from its signal ground. Connect the chips signal ground to the audio ground.
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Old 6th September 2013, 04:25 PM   #10
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Quote:
Originally Posted by palstanturhin View Post
Also saparate the chips power ground from its signal ground. Connect the chips signal ground to the audio ground.
Thanks for the advice, will do that.

Quote:
Originally Posted by palstanturhin View Post
Somehow separate the power ground from the audio ground, then connect them together in one point.
How would that go with the ground fill i am using? a jumper wire on the top layer?
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