MAX5821LEUA MAXIM [Maxim Integrated Products], MAX5821LEUA Datasheet

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MAX5821LEUA

Manufacturer Part Number
MAX5821LEUA
Description
Dual, 10-Bit, Low-Power, 2-Wire, Serial Voltage-Output DAC
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet

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Part Number:
MAX5821LEUA+
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The MAX5821 is a dual, 10-bit voltage-output, digital-to-
analog converter (DAC) with an I
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
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
circuit that powers up the DAC in the 100kΩ power-
down mode.
The MAX5821 features a double-buffered I
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.
19-2316; Rev 0; 1/02
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
I
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.
2
C is a trademark of Philips Corp.
TOP VIEW
Digital Gain and Offset Adjustments
Programmable Voltage and Current Sources
Programmable Attenuation
VCO/Varactor Diode Control
Low-Cost Instrumentation
Battery-Operated Instrumentation
®
output buffers and a power-on reset (POR)
GND
ADD
SCL
V
DD
________________________________________________________________ Maxim Integrated Products
1
2
4
DD
3
Dual, 10-Bit, Low-Power, 2-Wire, Serial
General Description
= 3.6V. A power-down mode
MAX5821
µMAX
230
Pin Configuration
Applications
6
8
7
5
2
C
OUTB
OUTA
REF
SDA
-compatible,
2
C-compati-
o Ultra-Low Supply Current
o 300nA Low-Power Power-Down Mode
o Single 2.7V to 5.5V Supply Voltage
o Fast 400kHz I
o Schmitt-Trigger Inputs for Direct Interfacing
o Rail-to-Rail Output Buffer Amplifiers
o Three Software-Selectable Power-Down Output
o Read-Back Mode for Bus and Data Checking
o Power-On Reset to Zero
o 8-Pin µMAX Package
MAX5821LEUA
MAX5821MEUA
Serial Interface
to Optocouplers
Impedances
115µA at V
135µA at V
100kΩ, 1kΩ, and High Impedance
PART
SDA
Voltage-Output DAC
µC
SCL
V
Typical Operating Circuit
DD
DD
DD
2
C-Compatible 2-Wire
-40
-40
= 3.6V
= 5.5V
o
o
RANGE
C to +85
C to +85
TEMP
Ordering Information
R
R
R
R
S
S
S
S
R
P
REF
o
o
C
C
R
SDA
REF
SCL
SDA
REF
P
SCL
PIN-
PACKAGE
8 µMAX
8 µMAX
MAX5821
MAX5821
OUTB
OUTB
Features
OUTA
OUTA
V
V
DD
DD
ADDRESS
0111 00X
1011 00X
V
DD
1

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MAX5821LEUA Summary of contents

Page 1

... Optocouplers o Rail-to-Rail Output Buffer Amplifiers 2 C-compati- 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 PART Applications MAX5821LEUA MAX5821MEUA SDA 8 OUTB 7 OUTA 6 REF 5 SDA Features = 3 ...

Page 2

Dual, 10-Bit, Low-Power, 2-Wire, Serial Voltage-Output DAC ABSOLUTE MAXIMUM RATINGS V , SCL, SDA to GND ............................................-0.3V to +6V DD OUT_, REF, ADD to GND..............................-0. Maximum Current into Any Pin............................................50mA Continuous Power Dissipation (T = +70°C) A 8-Pin ...

Page 3

Dual, 10-Bit, Low-Power, 2-Wire, Serial ELECTRICAL CHARACTERISTICS (continued +2.7V to +5.5V, GND = REF +5V +25°C.) (Note PARAMETER SYMBOL Input Hysteresis Input Leakage Current Input Capacitance DIGITAL ...

Page 4

Dual, 10-Bit, Low-Power, 2-Wire, Serial Voltage-Output DAC ELECTRICAL CHARACTERISTICS (continued +2.7V to +5.5V, GND = REF +5V +25°C.) (Note PARAMETER SYMBOL STOP Condition Setup Time ...

Page 5

Dual, 10-Bit, Low-Power, 2-Wire, Serial (V = +5V 5kΩ +25°C ZERO-CODE ERROR vs. SUPPLY VOLTAGE LOAD 0 2.7 3.4 4.1 4.8 SUPPLY VOLTAGE (V) GAIN ERROR vs. ...

Page 6

Dual, 10-Bit, Low-Power, 2-Wire, Serial Voltage-Output DAC (V = +5V 5kΩ +25°C POWER-DOWN SUPPLY CURRENT vs. SUPPLY VOLTAGE 500 Z = HIGH IMPEDANCE OUT NO LOAD 400 300 T = -40° ...

Page 7

Dual, 10-Bit, Low-Power, 2-Wire, Serial PIN NAME 1 V Power Supply DD 2 GND Ground 3 ADD Address Select. A logic high sets the address LSB logic low sets the address LSB to zero. 4 SCL Serial ...

Page 8

Dual, 10-Bit, Low-Power, 2-Wire, Serial Voltage-Output DAC Table 1. Power-Down Command Bits POWER-DOWN COMMAND BITS MODE/FUNCTION PD1 PD0 Power-up device. DAC output 0 0 restored to previous value. Power-down mode 0. Power down 0 1 device with output floating. Power-down ...

Page 9

Dual, 10-Bit, Low-Power, 2-Wire, Serial SCL SDA Figure 2. START and STOP Conditions SCL SDA STOP START LEGAL STOP CONDITION SCL SDA START ILLEGAL STOP ILLEGAL EARLY STOP CONDITION Figure 3. Early STOP conditions Acknowledge Bit (ACK) ...

Page 10

Dual, 10-Bit, Low-Power, 2-Wire, Serial Voltage-Output DAC MSB MSB MSB MSB EXAMPLE-WRITE TO POWER-DOWN REGISTER SEQUENCE Figure 6. Example-Write Command ...

Page 11

Dual, 10-Bit, Low-Power, 2-Wire, Serial impedance. Bypass V with a 0.1µF capacitor to DD ground as close to the device as possible. Chip Information TRANSISTOR COUNT: 11,186 PROCESS: BiCMOS Table 3. Command Byte Definitions SERIAL DATA INPUT ...

Page 12

Dual, 10-Bit, Low-Power, 2-Wire, Serial Voltage-Output DAC MSB MSB MSB Figure 8. Example-Read Word Data Sequence INPUT REGISTER A INPUT REGISTER B SERIAL ...

Page 13

Dual, 10-Bit, Low-Power, 2-Wire, Serial Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without ...

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