TPA3122 Groundings

[Cyberzim]

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.

 

[Cyberzim]

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.

 

[kkchunghk]

Any chance to see some picture of the amp?

 

[Cyberzim]

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.

 

[kkchunghk]

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.

 

[m-tech]

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.

 

[Cyberzim]

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.