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Old 17th September 2009, 06:36 PM   #1
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Default TPA3122 Groundings

Hi there,
I just recieved some samples from TI with the TPA3122.
But after reading the schematic in datasheets, I got very confused.
What is the different between analog ground and power ground?
http://focus.ti.com/lit/ds/symlink/tpa3122d2.pdf

Thank you,

Simon H.A.

Last edited by Cyberzim; 17th September 2009 at 06:45 PM. Reason: Forgot datasheets
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Old 17th September 2009, 10:19 PM   #2
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I sovled the problem.
Power ground is the negative supply.
It works like a charm, with fairly sound even without filters and even with only a plug-in supply on 14volt it gives good output.

Simon H.A.
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Old 18th September 2009, 05:14 AM   #3
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Any chance to see some picture of the amp?
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Old 18th September 2009, 07:57 AM   #4
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Right now it's on a breadboard, and I need to buy some capacitors that have the correct capacity, but when I'm done with the amp and pcb, I will upload some pictures.

Regards,

Simon H.A.
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Old 18th September 2009, 10:06 AM   #5
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I'm also interested to see your beard board. You see, I have made a pcb skipping the beard board stage and it didn't work - oscillation. I'm going back to square one and start a beard board first. It would help me a lot to look at arrangements that work. You will do me a big favour.
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Old 18th September 2009, 11:04 AM   #6
m-tech is offline m-tech  Serbia
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I don't now why you have so much problems with this amp. Schematic shows only few components.

This is my first prototype. It works great.
Attached Images
File Type: jpg TPA3122-1.jpg (123.9 KB, 198 views)
File Type: jpg TPA3122-2.jpg (109.3 KB, 202 views)

Last edited by m-tech; 18th September 2009 at 11:06 AM.
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Old 19th September 2009, 12:28 AM   #7
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Hi,
I have taken a photo of my breadboard. It might look very messed up, but that is because I have a big project on my breadboard, so I had little space to use.
Also I have read the output with a oscilloscope, when playing music so you can see how the output is.
I also have added a LC filter, but the inductor is homemade so I don't know the value on it, but the sound is very good now, and the bass is more smooth and clear.

Regards,

Simon H.A.
Attached Images
File Type: jpg Breadboard_setup1.jpg (94.6 KB, 182 views)
File Type: jpg P6200587.JPG (763.0 KB, 182 views)

Last edited by Cyberzim; 19th September 2009 at 12:33 AM.
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