First of all, let me preface this with the fact that I'm not an EE -- I'm a hobbyist with some experience and a background in software development.
I'm trying to use a TI PCM5102A Audio DAC with a Sierra Wireless BC127 Bluetooth module to output line level audio into an in-car amplifier. Anyways, the I2S link is operational and I'm getting audio from the DSP in the BT module to the DAC, but the gain is through the roof -- so much so that I had to add a pair of 10k resistors just to be able to listen to it via a pair of earbuds. I also tried it directly on the amp, and it was heavily distorted. I have issued the appropriate commands to the BC127 to set the gain as low as it can go (
VOLUME <A2DP Link ID> 1) and there was no change.
My questions are:
It feels like I'm missing something about how DSPs and DACs operate -- am I? Is there just an IC I need to add to tone down the audio?
Is there a more suitable DAC for what I'm trying to accomplish?
The BC127 has differential outputs that are suitable to drive a small speaker. Is there an IC I can use to convert the differential output to single ended line level?