19-2340; Rev 0; 1/02
12-Bit Low-Power, 2-Wire, Serial
Voltage-Output DAC
General Description
The MAX5812 is a single, 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 100µA at V
DD
= 3.6V. A low-power power-
down mode decreases current consumption to less than
1µA. The MAX5812 features three software-selectable
power-down output impedances: 100kΩ, 1kΩ, and high
impedance. Other features include an internal precision
Rail-to-Rail
®
output buffer and a power-on reset circuit
that powers up the DAC in the 100kΩ power-down mode.
The MAX5812 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
MAX5812 minimizes digital noise feedthrough by discon-
necting the clock (SCL) signal from the rest of the device
when an address mismatch is detected.
The MAX5812 is specified over the extended temperature
range of -40°C to +85°C and is available in a space-sav-
ing 6-pin SOT23 package. Refer to the MAX5811 for the
10-bit version.
o
Ultra-Low Supply Current
100µA at V
DD
= 3.6V
130µA at V
DD
= 5.5V
o
300nA Low-Power Power-Down Mode
o
Single 2.7V to 5.5V Supply Voltage
o
Fast 400kHz I
2
C-Compatible 2-Wire Serial
Interface
o
Schmitt-Trigger Inputs for Direct Interfacing to
Optocouplers
o
Rail-to-Rail Output Buffer Amplifier
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
Miniature 6-Pin SOT23 Package
Features
MAX5812
Ordering Information
PART
MAX5812LEUT
MAX5812MEUT
MAX5812NEUT
MAX5812PEUT
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
6 SOT23
6 SOT23
6 SOT23
6 SOT23
TOP
MARK
AAYT
AAYV
AAYX
AAYZ
Applications
Digital Gain and Offset Adjustments
Programmable Voltage and Current Sources
Programmable Attenuation
VCO/Varactor Diode Control
Low-Cost Instrumentation
Battery-Operated Equipment
Selector Guide appears at end of data sheet.
Functional Diagram appears at end of data sheet.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
I
2
C is a trademark of Philips Corporation.
Typical Operating Circuit
V
DD
µC
SDA
V
DD
SCL
R
P
R
P
R
S
SCL
R
S
SDA
R
S
SCL
R
S
SDA
MAX5812
MAX5812
Pin Configuration
TOP VIEW
V
DD
OUT
V
DD
1
GND
2
SDA
3
6
OUT
ADD
SCL
MAX5812
5
4
V
DD
OUT
SOT23
________________________________________________________________
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.
12-Bit Low-Power, 2-Wire, Serial
Voltage-Output DAC
MAX5812
ABSOLUTE MAXIMUM RATINGS
V
DD
, SCL, SDA to GND ............................................-0.3V to +6V
OUT, ADD to GND ........................................-0.3V to V
DD
+ 0.3V
Maximum Current Into Any Pin ...........................................50mA
Continuous Power Dissipation (T
A
= +70°C)
6-Pin SOT23 (derate 9.1mW above +70°C).................727mW
Operating Temperature Range ...........................-40°C to +85°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-65°C to +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, 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
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
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
SR
To 1/2LSB code 400 hex to C00 hex or
C00 hex to 400 hex (Note 5)
0.5
4
12
V/µs
µs
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
V
IH
V
IL
0.05
✕
V
DD
±0.1
6
±1
0.7
✕
V
DD
0.3
✕
V
DD
V
V
V
µA
pF
No load (Note 4)
Code = 800 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
or GND
0
1.2
42.2
15.1
8
8
±0.1
±1
V
DD
V
Ω
mA
µs
µA
GE
Code = FFF hex
N
INL
DNL
ZCE
(Note 3)
Guaranteed monotonic (Note 3)
Code = 000 hex, V
DD
= 2.7V
12
±2
±6
2.3
-0.8
0.26
-3
±16
±1
±40
Bits
LSB
LSB
mV
ppm/
o
C
%FS
ppm/
o
C
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
12-Bit Low-Power, 2-Wire, Serial
Voltage-Output DAC
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +5.5V, GND = 0, 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
Digital Feedthrough
Digital-to-Analog Glitch Impulse
POWER SUPPLIES
Supply Voltage Range
Supply Current with No Load
Power-Down Supply Current
TIMING CHARACTERISTICS (Figure 1)
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
STOP Condition Setup Time
Bus Capacitance
Maximum Duration of
Suppressed Pulse Widths
t
LOW
t
HIGH
t
SU, STA
t
HD, DAT
t
SU, DAT
t
r
t
f
t
f
t
SU-STO
C
b
t
SP
(Note 5)
0
(Note 5)
(Note 5)
(Note 5)
f
SCL
t
BUF
t
HD, STA
0
1.3
0.6
1.3
0.6
0.6
0
100
0
0
20 +
0.1C
b
0.6
400
50
300
300
250
0.9
400
kHz
µs
µs
µs
µs
µs
µs
ns
ns
ns
ns
µs
pF
ns
V
DD
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
2.7
100
130
0.3
5.5
170
190
1
V
µA
µA
SYMBOL
CONDITIONS
Code = 000 hex, digital inputs from 0 to V
DD
Major carry transition, code = 7FF hex to 800
hex and 800 hex to 7FF hex
MIN
TYP
0.2
12
MAX
UNITS
nV-s
nV-s
MAX5812
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 115 to 3981.
Offset and gain error limit the FSR.
Guaranteed by design. Not production tested.
_______________________________________________________________________________________
3
12-Bit Low-Power, 2-Wire, Serial
Voltage-Output DAC
MAX5812
Typical Operating Characteristics
(V
DD
= +5V, R
L
= 5kΩ, T
A
= +25°C.)
INTEGRAL NONLINEARITY
vs. INPUT CODE
MAX5812 toc01
INTEGRAL NONLINEARITY
vs. SUPPLY VOLTAGE
MAX5812 toc02
INTEGRAL NONLINEARITY
vs. TEMPERATURE
MAX5812 toc03
4
3
INTEGRAL NONLINEARITY (LSB)
2
1
0
-1
-2
-3
-4
0
1024
2048
INPUT CODE
3072
5
INTEGRAL NONLINEARITY (LSB)
5
INTEGRAL NONLINEARITY (LSB)
4
4
3
3
2
2
1
1
0
4096
2.7
3.4
4.1
4.8
5.5
SUPPLY VOLTAGE (V)
0
-40
-15
10
35
60
85
TEMPERATURE (°C)
DIFFERENTIAL NONLINEARITY
vs. INPUT CODE
MAX5812 toc04
DIFFERENTIAL NONLINEARITY
vs. SUPPLY VOLTAGE
MAX5812 toc05
DIFFERENTIAL NONLINEARITY
vs. TEMPERATURE
MAX5812 toc06
1.00
DIFFERENTIAL NONLINEARITY (LSB)
0.75
0.50
0.25
0
-0.25
-0.50
-0.75
-1.00
0
1024
2048
INPUT CODE
3072
0
DIFFERENTIAL NONLINEARITY (LSB)
0
DIFFERENTIAL NONLINEARITY (LSB)
-0.25
-0.25
-0.50
-0.50
-0.75
-0.75
-1.00
4096
2.7
3.4
4.1
4.8
5.5
SUPPLY VOLTAGE (V)
-1.00
-40
-15
10
35
60
85
TEMPERATURE (°C)
ZERO-CODE ERROR
vs. SUPPLY VOLTAGE
MAX8512 toc07
ZERO-CODE ERROR
vs. TEMPERATURE
MAX5812 toc08
GAIN ERROR
vs. SUPPLY VOLTAGE
MAX5812 toc09
10
10
-2.0
ZERO-CODE ERROR (mV)
ZERO-CODE ERROR (mV)
8
8
-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
0
2.7
3.4
4.1
4.8
5.5
SUPPLY VOLTAGE (V)
4
_______________________________________________________________________________________
12-Bit Low-Power, 2-Wire, Serial
Voltage-Output DAC
Typical Operating Characteristics (continued)
(V
DD
= +5V, R
L
= 5kΩ, T
A
= +25°C.)
GAIN ERROR vs. TEMPERATURE
MAX5812 toc10
MAX5812
DAC OUTPUT VOLTAGE
vs. OUTPUT SOURCE CURRENT (NOTE 6)
MAX5812 toc11
DAC OUTPUT VOLTAGE
vs. OUTPUT SINK CURRENT (NOTE 6)
MAX5812 toc12
-2.0
6
5
DAC OUTPUT VOLTAGE (V)
4
3
2
1
2.5
-1.2
DAC OUTPUT VOLTAGE (V)
-1.6
GAIN ERROR (%FSR)
2.0
1.5
CODE = 400 hex
1.0
-0.8
-0.4
NO LOAD
0
-40
-15
10
35
60
85
TEMPERATURE (°C)
0.5
CODE = FFF hex
0
0
2
4
6
8
10
OUTPUT SOURCE CURRENT (mA)
0
0
2
4
6
8
10
OUTPUT SINK CURRENT (mA)
SUPPLY CURRENT
vs. INPUT CODE
MAX5812 toc13
SUPPLY CURRENT
vs. TEMPERATURE
MAX5812 toc14
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX5812 toc15
120
100
SUPPLY CURRENT (µA)
80
60
40
20
NO LOAD
0
0
819
1638
2457
3276
100
100
SUPPLY CURRENT (µA)
SUPPLY CURRENT (µA)
NO LOAD
CODE = FFF hex
95
90
80
90
70
85
60
CODE = FFF hex
NO LOAD
50
35
60
85
2.7
3.4
4.1
4.8
5.5
80
4096
-40
-15
10
INPUT CODE
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
POWER-DOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
POWER-DOWN SUPPLY CURRENT (nA)
MAX5812 toc16
POWER-UP GLITCH
MAX5812 toc17
EXITING SHUTDOWN
MAX5812 toc18
500
400
T
A
= -40°C
T
A
= +25°C
200
T
A
= +85°C
Z
OUT
= HIGH IMPEDANCE
NO LOAD
0
2.7
3.4
4.1
4.8
5V
V
DD
0
OUT
500mV/div
300
OUT
10mV/div
100
5.5
100µs/div
SUPPLY VOLTAGE (V)
C
LOAD
= 200pF
2µs/div
CODE = 800 hex
Note 6:
The ability to drive loads less than 5kΩ is not implied.
_______________________________________________________________________________________
5
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