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: 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 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.
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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