MAX5821 Datasheet, PDF (1/13 Pages) Maxim Integrated Products – Dual, 10-Bit, Low-Power, 2-Wire, Serial Voltage-Output DAC

19-2316; Rev 0; 1/02
230
Dual, 10-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
General Description
The MAX5821 is a dual, 10-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
MAX5821 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 MAX5821 features a double-buffered I²C-compati-
ble serial interface that allows multiple devices to share
a single bus. All logic inputs are CMOS-logic compati-
ble and buffered with Schmitt triggers, allowing direct
interfacing to optocoupled and transformer-isolated
interfaces. The MAX5821 minimizes digital noise
feedthrough by disconnecting the clock (SCL) signal
from the rest of the device when an address mismatch
is detected.
The MAX5821 is specified over the extended tempera-
ture range of -40°C to +85°C and is available in a
miniature 8-pin µMAX package. Refer to the MAX5822
data sheet for the 12-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
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
MAX5821LEUA
MAX5821MEUA
TEMP
RANGE
-40^oC to +85^oC
-40^oC to +85^oC
PIN-
PACKAGE
8 µMAX
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
MAX5821
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 ^MAX5821 OUTA
REF
OUTB
R_S
SCL
V_DD
R_S
SDA ^MAX5821 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.