[G]atesphere, regular MSP430 tinkerer, came up with a library to interface the MSP430 to a TLV5620 8-bit quad-channel DAC from Texas Instruments. The MSP430 communicates to the DAC chip via a SPI interface. His code also includes support for simultaneous updating all  four channels of the DAC. Bonus code included to exercise all  functions of the DAC.

His blog details the code with examples. Leave a comment on his blog or you can also ask him questions in the forums.