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PDF MAX5822 Data sheet ( Hoja de datos )
| Número de pieza | MAX5822 | |
| Descripción | Dual / 12-Bit / Low-Power / 2-Wire / Serial Voltage-Output DAC | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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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 VDD = 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 VDD = 3.6V
135µA at VDD = 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 -40oC to +85oC 8 µMAX
MAX5822MEUA -40oC to +85oC 8 µMAX
ADDRESS
0111 00X
1011 00X
Typical Operating Circuit
VDD
µC
SDA SCL
RP
RP
VDD
TOP VIEW
VDD 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.
RS
SCL VDD
RS
SDA MAX5822 OUTA
REF OUTB
RS
SCL VDD
RS 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.
1 page  
Dual, 12-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
(VDD = +5V, RL = 5kΩ, TA = +25°C.)
ZERO-CODE ERROR
vs. SUPPLY VOLTAGE
10
8
6
4
2
0
2.7
NO LOAD
3.4 4.1 4.8
SUPPLY VOLTAGE (V)
5.5
GAIN ERROR vs. TEMPERATURE
-2.0
-1.6
-1.2
-0.8
-0.4
0
-40
-15 10 35
TEMPERATURE (°C)
NO LOAD
60 85
SUPPLY CURRENT vs. INPUT CODE
180
Typical Operating Characteristics (continued)
ZERO-CODE ERROR
vs. TEMPERATURE
10
8
6
4
2
0
-40
NO LOAD
-15 10 35 60
TEMPERATURE (°C)
85
DAC OUTPUT VOLTAGE
vs. OUTPUT SOURCE CURRENT (NOTE 6)
6
5
4
3
2
1
CODE = FFF hex
0
02468
OUTPUT SOURCE CURRENT (mA)
10
SUPPLY CURRENT vs. TEMPERATURE
180
GAIN ERROR vs. SUPPLY VOLTAGE
-2.0
-1.6
-1.2
-0.8
-0.4
0
2.7
NO LOAD
3.4 4.1 4.8
SUPPLY VOLTAGE (V)
5.5
DAC OUTPUT VOLTAGE
vs. OUTPUT SINK CURRENT (NOTE 6)
2.5
2.0
1.5
CODE = 400 hex
1.0
0.5
0
0
180
2468
OUTPUT SINK CURRENT (mA)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
10
160 160 160
140 140 140
120
100
0
819 1638 2457 3276 4096
INPUT CODE
120
NO LOAD
CODE = FFF hex
100
-40 -15 10
35
TEMPERATURE (°C)
60
85
120
100
2.7
CODE = FFF hex
NO LOAD
3.4 4.1 4.8
SUPPLY VOLTAGE (V)
5.5
_______________________________________________________________________________________ 5
5 Page 
Dual, 12-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
Chip Information
TRANSISTOR COUNT: 11,186
PROCESS: BiCMOS
Table 3. Command Byte Definitions
SERIAL DATA INPUT
C3 C2 C1 C0 D11
D10
D9
0
0
0
0
DAC
DATA
DAC
DATA
DAC
DATA
DAC
DAC
DAC
0 0 0 1 DATA DATA DATA
0
1
0
0
DAC
DATA
DAC
DATA
DAC
DATA
0
1
0
1
DAC
DATA
DAC
DATA
DAC
DATA
1
0
0
0
DAC
DATA
DAC
DATA
DAC
DATA
1
0
0
1
DAC
DATA
DAC
DATA
DAC
DATA
1
1
0
0
DAC
DATA
DAC
DATA
DAC
DATA
1
1
0
1
DAC
DATA
DAC
DATA
DAC
DATA
1110
X
X
X
1111
0
0
0
1111
0
0
0
1111
0
0
1
D8
DAC
DATA
DAC
DATA
DAC
DATA
DAC
DATA
DAC
DATA
DAC
DATA
DAC
DATA
DAC
DATA
X
0
1
0
FUNCTION
Load DAC A input and DAC registers with new data.
Contents of DAC B input registers are transferred to the
DAC register. Both outputs are updated.
Load DAC B input and DAC registers with new data.
Contents of DAC A input registers are transferred to the
DAC register. Both outputs are updated simultaneously.
Load DAC A input register with new data. DAC outputs
remain unchanged.
Load DAC B input register with new data. DAC outputs
remain unchanged.
Data in all input registers is transferred to respective DAC
registers. All DAC outputs are updated simultaneously.
New data is loaded into DAC A input register.
Data in all input registers is transferred to respective DAC
registers. All DAC outputs are updated simultaneously.
New data is loaded into DAC B input register.
Load all DACs with new data and update all DAC outputs
simultaneously. Both input and DAC registers are updated
with new data.
Load all input registers with new data. DAC outputs
remain unchanged.
Update all DAC outputs simultaneously. Device ignores
D11–D8. Do not send the data byte.
Extended command mode. The next word writes to the
power-down registers (Extended Command Mode).
Read DAC A data. The device expects an Sr condition
followed by an address word with R/W = 1.
Read DAC B data. The device expects an Sr condition
followed by an address word with R/W = 1.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MAX5822.PDF ] | |
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