Rainbow-electronics MAX5821 Manual de usuario

Busca en linea o descarga Manual de usuario para Sensores Rainbow-electronics MAX5821. Rainbow Electronics MAX5821 User Manual Manual de usuario

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General Description
The MAX5822 is a dual, 12-bit, voltage-output, digital-to-
analog converter (DAC) with an I
2
C
-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: 100k, 1k, 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 100k power-down
mode.
The MAX5822 features a double-buffered I
2
C-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
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 I
2
C-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
100k, 1k, and High Impedance
Read-Back Mode for Bus and Data Checking
Power-On Reset to Zero
8-Pin µMAX Package
MAX5822
Dual, 12-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
________________________________________________________________ Maxim Integrated Products 1
REF
SDASCL
1
2
8
7
OUTB
OUTAGND
ADD
V
DD
µMAX
TOP VIEW
3
4
6
5
MAX5822
Pin Configuration
Ordering Information
R
P
R
P
V
DD
µC
SDA
SCL
SDA
SDA
REF
REF
REF
SCL
SCL
V
DD
V
DD
R
S
R
S
V
DD
OUTA
OUTB
OUTA
OUTB
MAX5822
MAX5822
R
S
R
S
Typical Operating Circuit
19-2315; Rev 0; 1/02
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.
PART
TEMP
RANGE
PIN-
PACKAGE
ADDRESS
MAX5822LEUA -40
o
C to +85
o
C 8 µMAX 0111 00X
MAX5822MEUA -40
o
C to +85
o
C 8 µMAX 1011 00X
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
I
2
C is a trademark of Philips Corp.
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Indice de contenidos

Pagina 1 - Voltage-Output DAC

General DescriptionThe MAX5822 is a dual, 12-bit, voltage-output, digital-to-analog converter (DAC) with an I2C™-compatible, 2-wireinterface that oper

Pagina 2

MAX5822(Figure 7). Setting bits A or B to 1 sets that DAC to theselected power-down mode based on the states of PD0and PD1 (Table 1). Any combination

Pagina 3

Chip InformationTRANSISTOR COUNT: 11,186PROCESS: BiCMOSMAX5822Dual, 12-Bit, Low-Power, 2-Wire, SerialVoltage-Output DAC_______________________________

Pagina 4

MAX5822Dual, 12-Bit, Low-Power, 2-Wire, SerialVoltage-Output DAC12 ___________________________________________________________________________________

Pagina 5

MAX5822Dual, 12-Bit, Low-Power, 2-Wire SerialVoltage Output DACMaxim cannot assume responsibility for use of any circuitry other than circuitry entire

Pagina 6

MAX5822Dual, 12-Bit, Low-Power, 2-Wire, SerialVoltage-Output DAC2 ____________________________________________________________________________________

Pagina 7

MAX5822Dual, 12-Bit, Low-Power, 2-Wire, SerialVoltage-Output DAC______________________________________________________________________________________

Pagina 8

MAX5822Dual, 12-Bit, Low-Power, 2-Wire, SerialVoltage-Output DAC4 ____________________________________________________________________________________

Pagina 9

MAX5822Dual, 12-Bit, Low-Power, 2-Wire, SerialVoltage-Output DAC______________________________________________________________________________________

Pagina 10

MAX5822Dual, 12-Bit, Low-Power, 2-Wire, SerialVoltage-Output DAC6 ____________________________________________________________________________________

Pagina 11

Detailed DescriptionThe MAX5822 is a dual, 12-bit, voltage-output DAC withan I2C/SMBus-compatible 2-wire interface. The deviceconsists of a serial int

Pagina 12

MAX5822bus is 8 bits long and is always followed by anacknowledge clock pulse.The MAX5822 SDA and SCL drivers are open-drain out-puts, requiring a pul

Pagina 13 - Voltage Output DAC

Acknowledge Bit (ACK)The acknowledge bit (ACK) is the ninth bit attached toany 8-bit data word. ACK is always generated by thereceiving device. The MA

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