I want to experiment with microcontroller DDS. I have a couple Microchip MCP4822 12-bit DAC's, which I'll run at either 3.3V or 5V so I assume the output will max out close to that operating voltage. I found a commercial product that uses a DAC to Line Out to see how I might design my circuit, but I'm confused by the schematic. That DAC runs at 3.3V. The datasheet for the IC lists the typical output as 2.1V and the DAC board is not attenuating it. There's no resistive voltage divider or op-amp divider, just a simple RC low-pass filter (470R and 2.2nF). Isn't Line Out supposed to be 1V max? Should I buffer and reduce my own DAC output to no more than 1V? I'm probably going to send my DAC output to my Bose SoundLink Color, since it has an Aux input, is portable, and has pretty good sound.
Here's the commercial product (although it uses a 32-bit DAC):
https://shop.pimoroni.com/products/pico-audio-pack?variant=32369490853971
The schematic:
https://cdn.shopify.com/s/files/1/0174/1800/files/pico_audio_pack_schematic.pdf
And that DAC's datasheet:
https://www.ti.com/lit/gpn/pcm5100a
Here's the commercial product (although it uses a 32-bit DAC):
https://shop.pimoroni.com/products/pico-audio-pack?variant=32369490853971
The schematic:
https://cdn.shopify.com/s/files/1/0174/1800/files/pico_audio_pack_schematic.pdf
And that DAC's datasheet:
https://www.ti.com/lit/gpn/pcm5100a