19-3538; Rev 0; 2/05
Dual, 8-Bit, Low-Power, 2-Wire, Serial
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 fea-
tures three software-selectable power-down 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 sin-
gle 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 discon-
necting 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.
Digital Gain and Offset Adjustments
Programmable Voltage and Current Sources
VCO/Varactor Diode Control
♦ 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
♦ Schmitt-Trigger Inputs for Direct Interfacing
♦ Rail-to-Rail Output Buffer Amplifiers
♦ Three Software-Selectable Power-Down Output
100kΩ, 1kΩ, and High Impedance
♦ Readback Mode for Bus and Data Checking
♦ Power-On Reset to Zero
♦ 8-Pin µMAX Package
-40°C to +85°C 8 µMAX
-40°C to +85°C 8 µMAX
Typical Operating Circuit
SDA MAX5820 OUTA
RS SDA MAX5820 OUTA
µMAX is a registered trademark of Maxim Integrated Products, Inc.
*Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed Associate Companies, conveys a
license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the
I2C Standard Specification defined by Philips.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.