PT2314 burns when power supply is isolated

Hi,

I am happy to be a part of Arduino Community! This is my first post. Apologize if my posting is not perfect.

I am developing a 2 and 2.1 channel remote controller kit using PT2314 and Arduino Uno. PT2314 is absolutely amazing audio processor with 4 inputs, bass & treble controller and I2C/IIC communication.

The amplifier which I am using for testing purpose is a Class D amplifier which runs in 12V.

When I power up the amplifier and the audio processor circuit with the same power supply and with common ground, the audio processor circuit works fine without issues except for some digital circuit noise.

But when I power up with different power supplies for the audio processor circuit and the amplifier, the PT2314 becomes very hot and fails then on. In this case the the analog and digital ground are isolated. I am not sure if this isolated ground connection creates the problem. But I am sure there is a specific purpose the analog and digital ground are separated by the IC manufacturer.

Please find the pictures attached for the connections made. I sorry for the bad picture.

Anyone please suggest how to make this circuit work with different power supply for amplifier and audio processor / controller circuit.

In this case the the analog and digital ground are isolated. I am not sure if this isolated ground connection creates the problem.

I am.

But I am sure there is a specific purpose the analog and digital ground are separated by the IC manufacturer.

Yes it is to help to control noise. But they must be connected together at some single point. This allows you to have separate ground planes but they must be electrical at the same potential.

I get it. Thanks for your response.