The LTC1654 has REFHI pins for each DAC that can be driven up to VCC. The output will swing from 0V to VCC in a gain of 1 configuration or VCC/2 in a gain of 1/2 configuration. It operates from a single 2.7V to 5.5V supply. The LTC1654 has two programmable speeds: a FAST and SLOW mode with 1LSB settling times of 3s or 8.5s respectively and supply currents of 930A and 540A in the two modes. The LTC1654 also has shutdown capability, power-on reset and a clear function to 0V.