In the following schematic, I would like to decode PCM audio from my Raspberry Pi and output the signal to a 3W speaker. The PAM8302 datasheet is quite light. I don't understand what the input levels are. On the other hand, the PCM5100A PCM decoder offers a 2.1 Vrms stereo output with a 1kOhm load impedance.
I would like to properly connect the decoder to the amplifier without a potentiometer. Any idea?
Best Answer
The datasheet clearly states the closed-loop gain :
So you can reduce gain to adjust best dynamic range if required by adding x2 Rin on each + and - inputs. Otherwise if you require more gain you would need extra amplifiers to do that, but I presume the desired purpose of the pot is to reduce the gain so that max input occurs at max output with minimum distortion etc.