The MAX5812 is a single, 12-bit voltage-output, digital-toanalog converter (DAC) with an I2CTM-compatible 2-wire interface that operates at clock rates up to 400kHz. The device operates from a single 2.7V to 5.5V supply and draws only 100A at VDD = 3.6V. A low-power powerdown mode decreases current consumption to less than 1A. The MAX5812 features three software-selectable power-down output impedances: 100k, 1k, and high impedance. Other features include an internal precision Rail-to-Rail output buffer and a power-on reset circuit that powers up the DAC in the 100k power-down mode. The MAX5812 features a double-buffered I2C-compatible serial interface that allows multiple devices to share a single bus. All logic inputs are CMOS-logic compatible and buffered with Schmitt triggers, allowing direct interfacing to optocoupled and transformer-isolated interfaces. The MAX5812 minimizes digital noise feedthrough by disconnecting the clock (SCL) signal from the rest of the device when an address mismatch is detected.