DAC 2-CH Resistor-String 12-bit 8-Pin uMAX

The MAX5822 is a dual, 12-bit, voltage-output, digital-to-analog 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 power-down output impedances: 100kO, 1kO, 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 100kO 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 and the MAX5820 data sheet for the 8-bit version.

• Ultra-Low Supply Current
  • 115µA at V_dd = 3.6V
  • 135µA at V_dd = 5.5V

300nA Low-Power Power-Down Mode

Single 2.7V to 5.5V Supply Voltage

Fast 400kHz I²C-Compatible 2-Wire SerialInterface

Schmitt-Trigger Inputs for Direct Interfacing to Optocouplers

Rail-to-Rail Output Buffer Amplifiers

Three Software-Selectable Power-Down Output Impedances

• 100kO, 1kO, and High Impedance

Read-Back Mode for Bus and Data Checking

Power-On Reset to Zero

8-Pin µMAX Package