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.
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. The
MAX5820 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.
Key Features
Applications/Uses
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
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