Hi,
I'm using a SOM (System on module using NXP iMX8M) that has an option to use a WM8904 codec.
The thing is that, on the SOM, I can't access LINEOUT, only HPLOUT and HPROUT (output amp).
I want to drive a speaker with an OK quality mono signal, so I will use a summing opamp and then output the signal inside a LM4862.
Speaker I'd like to use :
https://www.digikey.ca/en/products/detail/cui-devices/CDS-15158-SMT-TR/5355550Now, according to the datasheet, the WM8904 has a built-in "Wolfson class W headphone amplifier". The datasheet is confusing.
Never heard of a class W amp. What I'd like to know is what kind of output should I expect from this amplifier?
The WM8904 seems to be powered by a 1.8V smps. But I wonder if it's DC-biased or not? The datasheet seems to
say the headphone output is ground referenced, does that mean it goes from something like 1.8V to -1.8V?
I wonder if anyone more familiar with this kind of IC could help out! Thanks! It's only really to power a small speaker.