I'm implementing the following audio single-ended to differential converter for an ADC:
This is the reference design for the PCM1804 that I intend to use.
What would happen if I do this:
Would it still work?
The reason I'm interested in doing this is demonstrated in the following diagram:
Even though I'm using an isolated power supply for my DSP, my amplifier internally connects the signal ground to the chassis. There's clearly a huge ground loop, consisting of the ground shield in the RCA cables and the car chassis that is a big source of noise.
I thought inserting a capacitor in the way of the ground as shown above would break this ground loop. But apparently, this is not a good idea. Any other suggestions are much appreciated.
I am aware of ground loop isolator transformers, but that's a band-aid fix, and they create a large amount of distortion.