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MAX5821：Dual, 10-Bit, Low-Power, 2-Wire, Serial Voltage-Output DAC

The MAX5821 is a dual, 10-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 MAX5821 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. The MAX5821 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 MAX5821 minimizes digital noise feedthrough by disconnecting the clock (SCL) signal from the rest of the device when an address mismatch is detected. The MAX5821 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 MAX5822 data sheet for the 12-bit version.

Key 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 Read-Back Mode for Bus and Data Checking Power-On Reset to Zero 8-Pin µMAX Package

MAX5821: Typical Operating Circuit Applications/Uses Battery-Powered Applications Digital Gain and Offset Control Low-Cost Instrumentation Programmable Attenuators Programmable Voltage and Current Sources VCO/Varactor Diode Control

DataSheet

Parametrics

Quality and Environmental Data

• MAX5821.pdf

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