General Description

The MAX5820 is a dual, 8-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 (115µA at VDD = 3.6V). A power-down mode decreases current consumption to less than 1µA. The MAX5820 features three software-selectable power-down 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.

Features

♦ Ultra-Low Supply Current

    115µA at VDD = 3.6V

    135µA at VDD = 5.5V

♦ 300nA Low-Power Power-Down Mode

♦ Single 2.7V to 5.5V Supply Voltage

♦ Fast 400kHz I2C-Compatible 2-Wire Serial Interface

♦ Schmitt-Trigger Inputs for Direct Interfacing to Optocouplers

♦ Rail-to-Rail Output Buffer Amplifiers

♦ Three Software-Selectable Power-Down Output Impedances 100kΩ, 1kΩ, and High Impedance

♦ Readback Mode for Bus and Data Checking

♦ Power-On Reset to Zero

♦ 8-Pin µMAX Package

Applications

    Digital Gain and Offset Adjustments

    Programmable Voltage and Current Sources

    Programmable Attenuation

    VCO/Varactor Diode Control

    Low-Cost Instrumentation

    Battery-Operated Instrumentation