AnsweredAssumed Answered

TDA7297 ground layout

Question asked by almeida.daniel on Jan 28, 2013
Latest reply on Feb 18, 2014 by zhao.yuntao
Hello everyone,
I can connect the input ground (from audio source) to power supply ground near the filter capacitors?
As about pgnd and signal ground I have to connect both to the power supply ground with diferent cables, or in the PCB for TDA7297 I can connect both pgnd and sgnd to a large conductive bar in the pcb with two filter capacitors (PCB is not the same as power supply)?
I have to connect the gnd to supply cause I will use another PCB with a design TDA2822M based for headphones.
In breadboards I had terrible instability problems when connected input gnd to power supply filter capacitors, and also when connecting pgnd and sgnd thru different cables, the only way is connect input gnd near the amplifier, otherwise strange noise will appear.
I hope that with good PCB layout all this problems disappear.
I will later make some PCB layouts and will post it here.

Thank you very much for your support,
Best regards,
Daniel Almeida