Maxim MAX5820 Dual 8‑Bit Low‑Power 2‑Wire Serial Voltage‑Output DAC Handbook

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. It operates from a single 2.7V to 5.5V supply (115µA at VDD = 3.6V). The device 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 MAX5820 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. It minimizes digital noise feedthrough by disconnecting the clock (SCL) signal from the rest of the device when an address mismatch is detected. The MAX5820 is specified over the extended (-40°C to +85°C) temperature range and is available in a small 8-pin µMAX® package. Refer to the MAX5822 data sheet for the 12-bit version and to the MAX5821 data sheet for a 10-bit version.

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