The MCP4725 is a cheap, simple 12-bit DAC chip. It works on a single supply, both 3.3V and 5V are fine, and has an I2C interface that runs at 100K, 400K, or 3.4M. Sounds like a pretty solid performer to me.
postscript: here’s the MCP4921, a very similar chip with a SPI interface.
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