MAX5822

19-2315; Rev 0; 1/02 Dual, 12-Bit, Low-Power, 2-Wire, Serial Voltage-Output DAC General Description The MAX5822 is a dual, 12-bit, voltage-output, digital-toanalog converter (DAC) with an I2C™-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 115µA at VDD = 3.6V. A power-down mode decreases current consumption to less than 1µA. The MAX5822 features three software-selectable powerdown output impedances: 100kΩ, 1kΩ, and high impedance. Other features include internal precision Rail-to-Rail® output buffers and a power-on reset (POR) circuit that powers up the DAC in the 100kΩ power-down mode. The MAX5822 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 MAX5822 minimizes digital noise feedthrough by disconnecting the clock (SCL) signal from the rest of the device when an address mismatch is detected. The MAX5822 is specified over the extended temperature range of -40°C to +85°C and is available in a miniature 8-pin µMAX package. Refer to the MAX5821 data sheet for the 10-bit version. o Ultra-Low Supply Current 115µA at VDD = 3.6V 135µA at VDD = 5.5V o 300nA Low-Power Power-Down Mode o Single 2.7V to 5.5V Supply Voltage o Fast 400kHz I2C-Compatible 2-Wire Serial Interfa...