Rainbow Electronics MAX5821 User Manual
General Description
The MAX5822 is a dual, 12-bit, voltage-output, digital-toanalog 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 powerdown 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 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 interfacing to optocoupled and transformer-isolated interfaces. 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 temperature range of -40°C to +85°C and is available in a miniature 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 VDD= 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
100kΩ, 1kΩ, 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
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.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
I
2
C is a trademark of Philips Corp.
PART
MAX5822LEUA -40
MAX5822MEUA -40oC to +85oC 8 µMAX 1011 00X
TEMP
RANGE
o
C to +85oC 8 µMAX 0111 00X
PINPACKAGE
ADDRESS
TOP VIEW
87OUTB
OUTAGND
REF
6
SDASCL
5
1
V
DD
2
ADD
MAX5822
3
4
µMAX
MAX5822
Dual, 12-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDD= +2.7V to +5.5V, GND = 0, V
REF
= VDD, RL= 5kΩ, CL= 200pF, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are
at V
DD
= +5V, TA= +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VDD, SCL, SDA to GND............................................-0.3V to +6V
OUT_, REF, ADD to GND..............................-0.3V to V
DD
+ 0.3V
Maximum Current into Any Pin............................................50mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin µMAX (derate 4.5mW above +70°C) ..................362mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Maximum Junction Temperature .....................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
STATIC ACCURACY (NOTE 2)
Resolution N 12 Bits
Integral Nonlinearity INL (Note 3) ±2 ±16 LSB
Differential Nonlinearity DNL Guaranteed monotonic (Note 3) ±1 LSB
Zero-Code Error ZCE Code = 000 hex, VDD = 2.7V 6 40 mV
Zero-Code Error Tempco 2.3 ppm/oC
Gain Error GE Code = FFF hex -0.8 -3 %FSR
Gain-Error Tempco 0.26 ppm/oC
Power-Supply Rejection Ratio PSRR Code = FFF hex, VDD = 4.5V to 5.5V 58.8 dB
DC Crosstalk 30 µV
REFERENCE INPUT
Reference Input Voltage Range V
Reference Input Impedance 65 90 kΩ
Reference Current Power-down mode 0.3 1 µA
DAC OUTPUT
Output Voltage Range No load (Note 4) 0 V
DC Output Impedance Code = 800 hex 1.2 Ω
Short-Circuit Current
Wake-Up Time
DAC Output Leakage Current
DIGITAL INPUTS (SCL, SDA)
Input High Voltage V
Input Low Voltage V
REF
VDD = 5V, V
V
DD
VDD = 5V 8
V
DD
Power-down mode = high impedance,
V
DD
IH
IL
OUT
= 3V, V
OUT
= 3V 8
= 5.5V, V
= full scale (short to GND) 42.2
= full scale (short to GND) 15.1
= VDD to GND
OUT
_
0V
±0.1 ±1µA
0.7 ✕
V
DD
0.3 ✕
DD
DD
V
DD
V
V
mA
µs
V
V
MAX5822
Dual, 12-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VDD= +2.7V to +5.5V, GND = 0, V
REF
= VDD, RL= 5kΩ, CL= 200pF, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are
at V
DD
= +5V, TA= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Hysteresis
Input Leakage Current Digital inputs = 0 or V
Input Capacitance 6pF
DIGITAL OUTPUT (SDA)
Output Logic Low Voltage V
Three-State Leakage Current I
Three-State Output Capacitance 6pF
DYNAMIC PERFORMANCE
Voltage-Output Slew Rate SR 0.5 V/µs
Voltage-Output Settling Time
Digital Feedthrough Code = 000 hex, digital inputs from 0 to V
Digital-to-Analog Glitch Impulse
DAC to DAC Crosstalk 2.4 nV-s
POWER SUPPLIES
Supply Voltage Range V
Supply Current with No Load I
Power-Down Supply Current I
TIMING CHARACTERISTICS (FIGURE 1)
Serial Clock Frequency f
Bus Free Time Between STOP
and START Conditions
START Condition Hold Time tHD,
SCL Pulse Width Low t
SCL Pulse Width High t
Repeated START Setup Time tSU,
Data Hold Time tHD,
Data Setup Time tSU,
SDA and SCL Receiving
Rise Time
SDA and SCL Receiving
Fall Time
SDA Transmitting Fall Time t
I
OL
L
DD
DD
DDPD
SCL
t
BUF
STA
LOW
HIGH
STA
DAT
DAT
t
r
t
f
f
= 3mA 0.4 V
SINK
Digital inputs = 0 or V
To 1/2LSB code 400 hex to C00 hex or
C00 hex to 400 hex (Note 5)
Major carry transition (code = 7FF hex to 800
hex and 800 hex to 7FF hex)
All digital inputs at 0 or VDD = 3.6V 115 205 µA
All digital inputs at 0 or VDD = 5.5V 135 215
All digital inputs at 0 or VDD = 5.5V 0.3 1 µA
(Note 5) 0 300 ns
(Note 5) 0 300 ns
(Note 5)
DD
DD
0.05
✕
V
DD
±0.1 ±1µA
±0.1 ±1µA
412µs
DD
2.7 5.5 V
0 400 kHz
1.3 µs
0.6 µs
1.3 µs
0.6 µs
0.6 µs
00.9µs
100 ns
20 +
0.1C
0.2 nV-s
12 nV-s
b
V
250 ns
MAX5822
Dual, 12-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
4 _______________________________________________________________________________________
Typical Operating Characteristics
(VDD= +5V, RL= 5kΩ, TA= +25°C.)
ELECTRICAL CHARACTERISTICS (continued)
(VDD= +2.7V to +5.5V, GND = 0, V
REF
= VDD, RL= 5kΩ, CL= 200pF, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are
at V
DD
= +5V, TA= +25°C.) (Note 1)
Note 1: All devices are 100% production tested at TA= +25°C and are guaranteed by design at TA= T
MIN
to T
MAX
.
Note 2: Static specifications are tested with the output unloaded.
Note 3: Linearity is guaranteed from codes 115 to 3981.
Note 4: Offset and gain error limit the FSR.
Note 5: Guaranteed by design. Not production tested.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
STOP Condition Setup Time tSU,
Bus Capacitance C
Maximum Duration of
Suppressed Pulse Widths
STO
(Note 5) 400 pF
b
t
SP
INTEGRAL NONLINEARITY
vs. INPUT CODE
4
3
2
1
0
INL (LSB)
-1
-2
-3
-4
0 4096
INPUT CODE
5
MAX5822 toc01
307220481024
4
3
INL (LSB)
2
1
0
INTEGRAL NONLINEARITY
vs. SUPPLY VOLTAGE
2.7 5.5
SUPPLY VOLTAGE (V)
4.84.13.4
MAX5822 toc02
5
4
3
INL (LSB)
2
1
0
0.6 µs
050ns
INTEGRAL NONLINEARITY
vs. TEMPERATURE
MAX5822 toc03
-40 85
TEMPERATURE (°C)
603510-15
DIFFERENTIAL NONLINEARITY
vs. INPUT CODE
1.00
0.75
0.50
0.25
0
DNL (LSB)
-0.25
-0.50
-0.75
-1.00
0 4096
INPUT CODE
MAX5822 toc04
-0.25
-0.50
DNL (LSB)
-0.75
307220481024
-1.00
DIFFERENTIAL NONLINEARITY
vs. SUPPLY VOLTAGE
0
2.7 5.5
SUPPLY VOLTAGE (V)
4.84.13.4
MAX5822 toc05
DIFFERENTIAL NONLINEARITY
vs. TEMPERATURE
0
-0.25
-0.50
DNL (LSB)
-0.75
-1.00
-40 85
TEMPERATURE (°C)
MAX5822 toc06
603510-15
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