MAX5822 Datasheet, PDF (1/13 Pages) Maxim Integrated Products – Dual, 12-Bit, Low-Power, 2-Wire, Serial Voltage-Output DAC

19-2315; Rev 0; 1/02
Dual, 12-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
General Description
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 V_DD = 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 imped-
ance. 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 inter-
facing to optocoupled and transformer-isolated inter-
faces. 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 tempera-
ture range of -40°C to +85°C and is available in a minia-
ture 8-pin µMAX package. Refer to the MAX5821 data
sheet for the 10-bit version.
Applications
Digital Gain and Offset Adjustments
Programmable Voltage and Current Sources
Programmable Attenuation
VCO/Varactor Diode Control
Low-Cost Instrumentation
Battery-Powered Instrumentation
Pin Configuration
Features
o Ultra-Low Supply Current
115µA at V_DD = 3.6V
135µA at V_DD = 5.5V
o 300nA Low-Power Power-Down Mode
o Single 2.7V to 5.5V Supply Voltage
o Fast 400kHz I²C-Compatible 2-Wire Serial
Interface
o Schmitt-Trigger Inputs for Direct Interfacing to
Optocouplers
o Rail-to-Rail Output Buffer Amplifiers
o Three Software-Selectable Power-Down Output
Impedances
100kΩ, 1kΩ, and High Impedance
o Read-Back Mode for Bus and Data Checking
o Power-On Reset to Zero
o 8-Pin µMAX Package
Ordering Information
PART
TEMP
RANGE
PIN-
PACKAGE
MAX5822LEUA -40^oC to +85^oC 8 µMAX
MAX5822MEUA -40^oC to +85^oC 8 µMAX
ADDRESS
0111 00X
1011 00X
Typical Operating Circuit
V_DD
V_DD
µC
SDA
SCL
R_P
R_P
TOP VIEW
V_DD 1
GND 2
ADD 3
SCL 4
MAX5822
8 OUTB
7 OUTA
6 REF
5 SDA
µMAX
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
I²C is a trademark of Philips Corp.
R_S
SCL
V_DD
R_S
SDA ^MAX5822 OUTA
REF
OUTB
R_S
SCL
V_DD
R_S
SDA ^MAX5822 OUTA
REF
OUTB
REF
________________________________________________________________ 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.