19-2316; Rev 1; 2/05
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 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
115µA at V
DD
= 3.6V. A power-down mode decreases
current consumption to less than 1µA. The MAX5821 fea-
tures 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 I
2
C-compatible
serial interface that allows multiple devices to share a sin-
gle bus. All logic inputs are CMOS-logic compatible and
buffered with Schmitt triggers, allowing direct interfacing
to optocoupled and transformer-isolated interfaces. The
MAX5821 minimizes digital noise feedthrough by discon-
necting the clock (SCL) signal from the rest of the device
when an address mismatch is detected.
The MAX5821 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 MAX5822 data sheet
for the 12-bit version and the MAX5820 data sheet for the
8-bit version.
♦
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
100kΩ, 1kΩ, and High Impedance
♦
Read-Back Mode for Bus and Data Checking
♦
Power-On Reset to Zero
♦
8-Pin µMAX Package
Features
MAX5821
Ordering Information
PART
MAX5821LEUA
MAX5821MEUA
TEMP
RANGE
-40
o
C to +85
o
C
-40
o
C to +85
o
C
PIN-
PACKAGE
8 µMAX
8 µMAX
ADDRESS
0111 00X
1011 00X
Applications
Digital Gain and Offset Adjustments
Programmable Voltage and Current Sources
Programmable Attenuation
VCO/Varactor Diode Control
Low-Cost Instrumentation
Battery-Operated Instrumentation
Typical Operating Circuit
V
DD
μC
SDA
V
DD
SCL
R
P
R
P
Pin Configuration
TOP VIEW
V
DD
GND
ADD
1
2
8
7
OUTB
OUTA
REF
R
S
SCL
R
S
SDA
MAX5821
REF
V
DD
OUTA
OUTB
MAX5821
3
6
5
SCL
4
SDA
μMAX
R
S
SCL
R
S
SDA
REF
REF
MAX5821
V
DD
OUTA
OUTB
µMax is a registered trademark of Maxim Integrated Products, Inc.
________________________________________________________________
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.
Dual, 10-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
MAX5821
ABSOLUTE MAXIMUM RATINGS
V
DD
, 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
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.
ELECTRICAL CHARACTERISTICS
(V
DD
= +2.7V to +5.5V, GND = 0, V
REF
= V
DD
, R
L
= 5kΩ, C
L
= 200pF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are
at V
DD
= +5V, T
A
= +25°C.) (Note 1)
PARAMETER
STATIC ACCURACY (NOTE 2)
Resolution
Integral Nonlinearity
Differential Nonlinearity
Zero-Code Error
Zero-Code Error Tempco
Gain Error
Gain-Error Tempco
Power-Supply Rejection Ratio
DC Crosstalk
REFERENCE INPUT
Reference Input Voltage Range
Reference Input Impedance
Reference Current
DAC OUTPUT
Output-Voltage Range
DC Output Impedance
Short-Circuit Current
Wake-Up Time
DAC Output Leakage Current
DIGITAL INPUTS (SCL, SDA)
Input High Voltage
Input Low Voltage
V
IH
V
IL
0.7
✕
V
DD
0.3
✕
V
DD
V
V
No load (Note 4)
Code = 200 hex
V
DD
= 5V, V
OUT
= full scale (short to GND)
V
DD
= 3V, V
OUT
= full scale (short to GND)
V
DD
= 5V
V
DD
= 3V
Power-down mode = high impedance,
V
DD
= 5.5V, V
OUT
_ = V
DD
to GND
0
1.2
42.2
15.1
8
8
±0.1
±1
V
DD
V
Ω
mA
µs
µA
Power-down mode
V
REF
0
65
90
0.3
1
V
DD
V
kΩ
µA
PSRR
Code = 3FF hex, V
DD
= 4.5V to 5.5V
GE
Code = 3FF hex
N
INL
DNL
ZCE
(Note 3)
Guaranteed monotonic (Note 2)
Code = 000 hex, V
DD
= 2.7V
6
2.3
-0.8
0.26
58.8
30
-3
10
±0.5
±4
±0.5
40
Bits
LSB
LSB
mV
ppm/
o
C
%FSR
ppm/
o
C
dB
µV
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
Dual, 10-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +5.5V, GND = 0, V
REF
= V
DD
, R
L
= 5kΩ, C
L
= 200pF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are
at V
DD
= +5V, T
A
= +25°C.) (Note 1)
PARAMETER
Input Hysteresis
Input Leakage Current
Input Capacitance
DIGITAL OUTPUT (SDA)
Output Logic Low Voltage
Three-State Leakage Current
Three-State Output Capacitance
DYNAMIC PERFORMANCE
Voltage-Output Slew Rate
Voltage-Output Settling Time
Digital Feedthrough
Digital-to-Analog Glitch Impulse
DAC-to-DAC Crosstalk
POWER SUPPLIES
Supply Voltage Range
Supply Current with No Load
Power-Down Supply Current
Serial Clock Frequency
Bus Free Time Between STOP
and START Conditions
START Condition Hold Time
SCL Pulse Width Low
SCL Pulse Width High
Repeated START Setup Time
Data Hold Time
Data Setup Time
SDA and SCL Receiving
Rise Time
SDA and SCL Receiving
Fall Time
SDA Transmitting Fall Time
V
DD
I
DD
I
DDPD
f
SCL
t
BUF
t
HD
,
STA
t
LOW
t
HIGH
t
SU
,
STA
t
HD
,
DAT
t
SU
,
DAT
t
r
t
f
t
f
(Note 5)
(Note 5)
(Note 5)
All digital inputs at 0 or V
DD
= 3.6V
All digital inputs at 0 or V
DD
= 5.5V
All digital inputs at 0 or V
DD
= 5.5V
0
1.3
0.6
1.3
0.6
0.6
0
100
0
0
20 +
0.1C
b
300
300
250
0.9
2.7
115
135
0.3
5.5
205
215
1
400
V
µA
µA
kHz
µs
µs
µs
µs
µs
µs
ns
ns
ns
ns
SR
To 1/2LSB code 100 hex to 300 hex or
300 hex to 100 hex (Note 5)
Code = 000 hex, digital inputs from 0 to V
DD
Major carry transition (code = 1FF hex to 200
hex and 200 hex to 1FF hex)
0.5
4
0.2
12
2.4
12
V/µs
µs
nV-s
nV-s
nV-s
V
OL
I
L
I
SINK
= 3mA
Digital inputs = 0 or V
DD
±0.1
6
0.4
±1
V
µA
pF
Digital inputs = 0 or V
DD
SYMBOL
CONDITIONS
MIN
0.05
✕
V
DD
±0.1
6
±1
TYP
MAX
UNITS
V
µA
pF
MAX5821
TIMING CHARACTERISTICS (FIGURE 1)
_______________________________________________________________________________________
3
Dual, 10-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
MAX5821
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +5.5V, GND = 0, V
REF
= V
DD
, R
L
= 5kΩ, C
L
= 200pF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are
at V
DD
= +5V, T
A
= +25°C.) (Note 1)
PARAMETER
STOP Condition Setup Time
Bus Capacitance
Maximum Duration of
Suppressed Pulse Widths
SYMBOL
t
SU
,
STO
C
b
t
SP
(Note 5)
0
CONDITIONS
MIN
0.6
400
50
TYP
MAX
UNITS
µs
pF
ns
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
All devices are 100% production tested at T
A
= +25°C and are guaranteed by design for T
A
= T
MIN
to T
MAX
.
Static specifications are tested with the output unloaded.
Linearity is guaranteed from codes 28 to 995.
Offset and gain error limit the FSR.
Guaranteed by design. Not production tested.
Typical Operating Characteristics
(V
DD
= +5V, R
L
= 5kΩ, T
A
= +25°C.)
INTEGRAL NONLINEARITY
vs. INPUT CODE
0.75
0.50
INL (LSB)
INL (LSB)
INL (LSB)
0.25
0
-0.25
-0.50
-0.75
-1.00
0
256
512
INPUT CODE
768
1024
0
2.7
3.4
4.1
4.8
5.5
SUPPLY VOLTAGE (V)
0
-40
-15
10
35
60
85
TEMPERATURE (°C)
0.75
0.75
MAX5821 toc01
INTEGRAL NONLINEARITY
vs. SUPPLY VOLTAGE
MAX5821 toc02
INTEGRAL NONLINEARITY
vs. TEMPERATURE
MAX5821 toc03
1.00
1.25
1.25
1.00
1.00
0.50
0.50
0.25
0.25
DIFFERENTIAL NONLINEARITY
vs. INPUT CODE
0.75
0.50
DNL (LSB)
DNL (LSB)
MAX5821 toc04
DIFFERENTIAL NONLINEARITY
vs. SUPPLY VOLTAGE
MAX5821 toc05
DIFFERENTIAL NONLINEARITY
vs. TEMPERATURE
MAX5821 toc06
1.00
0
0
-0.1
-0.1
0
-0.25
-0.50
-0.75
-1.00
0
256
512
INPUT CODE
768
1024
-0.3
DNL (LSB)
2.7
5.5
0.25
-0.2
-0.2
-0.3
-0.4
-0.4
-0.5
3.4
4.1
4.8
SUPPLY VOLTAGE (V)
-0.5
-40
-15
10
35
60
85
TEMPERATURE (°C)
4
_______________________________________________________________________________________
Dual, 10-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
MAX5821
Typical Operating Characteristics (continued)
(V
DD
= +5V, R
L
= 5kΩ, T
A
= +25°C.)
ZERO-CODE ERROR
vs. SUPPLY VOLTAGE
MAX5821 toc07
ZERO-CODE ERROR
vs. TEMPERATURE
MAX5821 toc08
GAIN ERROR vs. SUPPLY VOLTAGE
MAX5821 toc09
10
10
-2.0
8
ZERO-CODE ERROR (mV)
8
ZERO-CODE ERROR (mV)
-1.6
GAIN ERROR (%FSR)
6
6
-1.2
4
4
-0.8
2
NO LOAD
0
2.7
3.4
4.1
4.8
5.5
SUPPLY VOLTAGE (V)
2
NO LOAD
0
-40
-15
10
35
60
85
TEMPERATURE (°C)
-0.4
NO LOAD
2.7
3.4
4.1
4.8
5.5
0
SUPPLY VOLTAGE (V)
GAIN ERROR vs. TEMPERATURE
MAX5821 toc10
DAC OUTPUT VOLTAGE
vs. OUTPUT SOURCE CURRENT (NOTE 6)
MAX5821 toc11
DAC OUTPUT VOLTAGE
vs. OUTPUT SINK CURRENT (NOTE 6)
MAX5821 toc12
-2.0
6
5
DAC OUTPUT VOLTAGE (V)
4
3
2
1
2.5
DAC OUTPUT VOLTAGE (V)
-1.6
GAIN ERROR (%FSR)
2.0
-1.2
1.5
CODE = 100 hex
-0.8
1.0
-0.4
NO LOAD
-40
-15
10
35
60
85
0.5
CODE = 3FF hex
0
0
2
4
6
8
10
OUTPUT SOURCE CURRENT (mA)
0
0
2
4
6
8
10
OUTPUT SINK CURRENT (mA)
0
TEMPERATURE (°C)
SUPPLY CURRENT vs. INPUT CODE
MAX5821 toc13
SUPPLY CURRENT vs. TEMPERATURE
MAX5821 toc14
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX5821 toc15
180
180
180
SUPPLY CURRENT (µA)
SUPPLY CURRENT (µA)
140
140
SUPPLY CURRENT (µA)
160
160
160
140
120
120
NO LOAD
CODE = 3FF hex
120
CODE = 3FF hex
NO LOAD
100
100
0
205
410
615
820
1024
INPUT CODE
100
-40
-15
10
35
60
85
2.7
3.4
4.1
4.8
5.5
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
5
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