I'd like to get audio (specifically a line out) from a Cortex-M4 10 bit DAC (LPC-4337). The dev board I'm using already has a 470 Ohm resistor in series with the DAC. Since I've never worked with sound I'll appreciate any advice on the following:
1) How should I bias the 0-3.3v DAC output to an AC wave centered at 0v?
2) Should I block DC with a polarized series capacitor at the output?
3) How could I electrically protect the mcu DAC pin?
I only have 5v, 3v3 and ground available, no negative voltage.
I suspect a single supply, unity gain op-amp with bias will do, but I've never used an op-amp for this application. An example will be very appreciated.
Thanks in advance!