What is the resolution of your DAC?
For IC DACs, a "current steering" topology might be helpful because you dont have cappacitors neither resistors to integrate (which consume large area) but the chip becomes larger for 12 or more bits and also the decoding circuitry becomes more complex.
The basic idea is to steer a current into a current source by biassing or not a pair of two NMOS transistors (complementary biassed).
I can provide you some basic circuitry if you are interested in this topology.