This breakout board has 4 DAC ports, controlled by I²C protocol. It is based on the default schematic from MCP4728 datasheet and Adafruit breakout board.
Attention! Output voltage will depend on the input! To imagine how that works, let's say you have a 5V source. Integer you are sending using I²C varies from 0 to 4095. Now, when you have 5V input and 4095 on I²C, you'll have 5V on the output. If you set 0 on I²C, you'll get zero voltage. But you can put any value between 0 and 4095, too, getting all possible in-between voltages. Same goes for 3.3V.
It is currently untested, but the board seems simple enough so there should be no errors.
- Adafruit breakout board documentation