MAX5820 Datasheet, PDF (1/13 Pages) Maxim Integrated Products – Dual, 8-Bit, Low-Power, 2-Wire, Serial Voltage-Output DAC

19-3538; Rev 0; 2/05
Dual, 8-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
General Description
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 V_DD = 3.6V). A power-down mode decreases
current consumption to less than 1µA. The MAX5820 fea-
tures 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 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.
Applications
Digital Gain and Offset Adjustments
Programmable Voltage and Current Sources
Programmable Attenuation
VCO/Varactor Diode Control
Low-Cost Instrumentation
Battery-Operated Instrumentation
Pin Configuration
TOP VIEW
V_DD 1
GND 2
ADD 3
SCL 4
MAX5820
8 OUTB
7 OUTA
6 REF
5 SDA
µMAX
Features
♦ Ultra-Low Supply Current
115µA at V_DD = 3.6V
135µA at V_DD = 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
♦ Readback Mode for Bus and Data Checking
♦ Power-On Reset to Zero
♦ 8-Pin µMAX Package
Ordering Information
PART
MAX5820LEUA
MAX5820MEUA
TEMP
RANGE
PIN-
PACKAGE
-40°C to +85°C 8 µMAX
-40°C to +85°C 8 µMAX
ADDRESS
0111 00X
1011 00X
Typical Operating Circuit
VDD
VDD
µC
SDA
SCL
RP
RP
RS
SCL
VDD
RS
SDA ^MAX5820 OUTA
REF
OUTB
RS
SCL
VDD
RS
SDA ^MAX5820 OUTA
REF
OUTB
REF
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.