19-2125; Rev 3; 4/05
10-Bit, Low-Power, Dual, Voltage-Output
DAC with Serial Interface
General Description
The MAX5721 dual 10-bit, low-power, buffered voltage-
output, digital-to-analog converter (DAC) is packaged
in a space-saving 8-pin µMAX
®
package (5mm
✕
3mm). The wide supply voltage range of +2.7V to
+5.5V and 112µA supply current accommodate low-
power and low-voltage applications. DAC outputs
employ on-chip precision output amplifiers that swing
rail-to-rail. The MAX5721’s reference input accepts a
voltage range from 0 to V
DD
. In power-down the refer-
ence input is high impedance, further reducing the sys-
tem’s total power consumption.
The 20MHz, 3-wire SPI™, QSPI™, MICROWIRE™ and
DSP-compatible serial interface saves board space
and reduces the complexity of opto- and transformer-
isolated applications. The MAX5721 on-chip power-on
reset (POR) circuit resets the DAC outputs to zero and
loads the output with a 100kΩ resistor to ground. This
provides additional safety for applications that drive
valves or other transducers that need to be off on
power-up. The MAX5721’s software-controlled power-
down reduces supply current to less than 0.3µA and
provides software-selectable output loads (1kΩ, 100kΩ,
or high impedance) while in power-down. The
MAX5721 is specified over the -40°C to +125°C auto-
motive temperature range
♦
Ultra-Low Power Consumption
112µA at V
DD
= +3.6V
135µA at V
DD
= +5.5V
♦
Wide +2.7V to +5.5V Single-Supply Range
♦
Tiny 8-Pin µMAX Package
♦
0.3µA Power-Down Current
♦
Guaranteed 10-Bit Monotonicity (±1LSB DNL)
♦
Safe Power-Up Reset to Zero Volts at DAC Output
♦
Three Software Selectable Power-Down
Impedances (100kΩ, 1kΩ, Hi-Z)
♦
Fast 20MHz, 3-Wire SPI, QSPI, and MICROWIRE-
Compatible Serial Interface
♦
Rail-to-Rail Output Buffer Amplifiers
♦
Schmitt-Triggered Logic Inputs for Direct
Interface to Optocouplers
♦
Wide -40°C to +125°C Operating Temperature
Range
Features
MAX5721
Applications
Automatic Tuning
Gain and Offset Adjustment
Power Amplifier Control
Process Control I/O Boards
Battery-Powered Instruments
VCO Control
TOP VIEW
Ordering Information
PART
MAX5721EUA
MAX5721AUA
TEMP RANGE
-40°C to +85°C
-40°C to +125°C
PIN-PACKAGE
8 µMAX
8 µMAX
Pin Configuration
Functional Diagram appears at end of data sheet.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor, Corp.
V
DD
1
GND
2
8
7
OUTB
OUTA
REF
DIN
MAX5721
CS
3
6
5
SCLK
4
µMAX
________________________________________________________________
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.
10-Bit, Low-Power, Dual, Voltage-Output
DAC with Serial Interface
MAX5721
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND ..............................................................-0.3V to +6V
OUT_, SCLK, DIN,
CS,
REF to GND...............-0.3 to (V
DD
+0.3V)
Maximum Continuous Current Into Any Pin......................±50mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin µMAX (derate 4.6 mW/°C above +70°C) ............362mW
Operating Temperature Range .........................-40°C to +125°C
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, V
REF
= V
DD
, R
L
= 5kΩ, C
L
= 200pF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are
V
DD
= +5V, T
A
= +25°C.)
PARAMETER
STATIC ACCURACY
(Note 1)
Resolution
Intergral Nonlinearity Error
Differential Nonlinearity Error
Zero-Code Error
Zero-Code Error Tempco
Gain Error
Gain-Error Tempco
Power-Supply Rejection Ratio
REFERENCE INPUT
Reference Input Voltage Range
Reference Input Impedance
Reference-Down Reference
Current
DAC OUTPUT
Output Voltage Range
DC Output Impedance
Short-Circuit Current
Wake-Up Time
Output Leakage Current
No load (Note 4)
Code = 200 hex
V
DD
= +3V
V
DD
= +5V
V
DD
= +3V
V
DD
= +5V
Power-down mode = output high
impedance
0
0.8
15
48
8
8
±18
V
DD
V
Ω
mA
µs
nA
V
REF
R
REF
In operation
In power-down mode
In power-down mode (Note 3)
0
64
90
2
1
10
V
DD
126
V
kΩ
MΩ
µA
PSRR
Code = 3FF hex,
∆V
DD
= ±10%
GE
Code = 3FF hex
0.26
58.8
N
INL
DNL
OE
(Note 2)
Guaranteed monotonic (Note 2)
Code = 000
0.4
2.3
±3
10
±0.5
±4
±1
1.5
Bits
LSB
LSB
% of FS
ppm/°C
% of FS
ppm/°C
dB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
10-Bit, Low-Power, Dual, Voltage-Output
DAC with Serial Interface
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
V
DD
= +5V, T
A
= +25°C.)
PARAMETER
DIGITAL INPUTS (SCLK, DIN,
CS)
Input High Voltage
Input Low Voltage
Input Leakage Current
Input Capacitance
DYNAMIC PERFORMANCE
Voltage-Output Slew Rate
Voltage-Output Settling Time
Digital Feedthrough
Digital-Analog Glitch Inpulse
DAC-to-DAC Crosstalk
POWER REQUIREMENTS
Supply Voltage Range
Supply Current with No Load
Power-Down Supply Current
V
DD
I
DD
I
DDPD
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
112
135
0.29
5.5
205
215
1
V
µA
µA
SR
100 hex to 300 hex (Note 5)
All digital inputs from 0 to V
DD
Major carry transition (code 1FF hex to
code 200 hex)
0.5
4
0.1
12
10
V/µs
µs
nV-s
nV-s
nV-s
V
IH
V
IL
I
IN
V
DD
= +3V, +5V
V
DD
= +3V, +5V
Digital inputs = 0 or V
DD
±0.1
5
0.7 x
V
DD
0.3 x
V
DD
±1
V
V
µA
pF
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX5721
TIMING CHARACTERISTICS
(V
DD
= 2.7V to 5.5V, GND = 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
SCLK Clock Frequency
SCLK Pulse Width High
SCLK Pulse Width Low
CS
Fall to SCLK Rise Setup Time
SCLK Fall to
CS
Rise Setup Time
DIN to SCLK Fall Setup Time
DIN to SCLK Fall Hold Time
CS
Pulse Width High
SYMBOL
f
SCLK
t
CH
t
CL
t
CSS
t
CSH
t
DS
t
DH
t
CSW
CONDITIONS
MIN
0
25
25
10
10
15
0
80
TYP
MAX
20
UNITS
MHz
ns
ns
ns
ns
ns
ns
ns
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
DC specifications are tested without output loads.
Linearity guaranteed from code 29 to code 995.
Limited with test conditions.
Offset and gain error limit the FSR.
Guaranteed by design.
_______________________________________________________________________________________
3
10-Bit, Low-Power, Dual, Voltage-Output
DAC with Serial Interface
MAX5721
__________________________________________Typical Operating Characteristics
(V
REF
= V
DD
, T
A
= +25°C, unless otherwise noted.)
INTEGRAL NONLINEARITY
vs. CODE, T
A
= +25°C
MAX5721 toc01
DIFFERENTIAL NONLINEARITY
vs. CODE, T
A
= +25°C
MAX5721 toc02
TOTAL UNADJUSTED ERROR
vs. CODE (T
A
= +25°C)
0.8
MAX5721 toc03
4
3
2
V
DD
= +3V
0.25
0.20
0.15
0.10
DNL (LSB)
0.05
0
-0.05
-0.10
-0.15
-0.20
-0.25
1.0
TOTAL UNADJUSTED ERROR (%)
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
V
DD
=
+3V
0
V
DD
=
+5V
INL (LSB)
1
0
-1
-2
-3
-4
0
256
512
CODE
768
1024
V
DD
= +5V
0
256
512
CODE
768
1024
128 256 384 512 640 768 896 1024
CODE
INTEGRAL NONLINEARITY
vs. CODE, T
A
= -40°C
MAX5721 toc04
DIFFERENTIAL NONLINEARITY
vs. CODE, T
A
= -40°C
MAX5721 toc05
TOTAL UNADJUSTED ERROR
vs. CODE (T
A
= -40°C)
0.8
MAX5721 toc06
4
3
2
V
DD
= +5V
0.25
0.20
0.15
0.10
DNL (LSB)
0.05
0
-0.05
-0.10
-0.15
-0.20
-0.25
1.0
TOTAL UNADJUSTED ERROR (%)
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
V
DD
=
+3V
0
V
DD
=
+5V
INL (LSB)
1
0
-1
-2
-3
-4
0
256
512
CODE
768
1024
V
DD
= +3V
0
256
512
CODE
768
1024
128 256 384 512 640 768 896 1024
CODE
INTEGRAL NONLINEARITY
vs. CODE, T
A
= +125°C
MAX5721 toc07
DIFFERENTIAL NONLINEARITY
vs. CODE, T
A
= +125°C
0.20
0.15
0.10
DNL (LSB)
0.05
0
-0.05
-0.10
-0.15
-0.20
-0.25
MAX5721 toc08
TOTAL UNADJUSTED ERROR
vs. CODE (T
A
= +125°C)
0.8
TOTAL UNADJUSTED ERROR (%)
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
V
DD
=
+3V
0
128 256 384 512 640 768 896 1024
CODE
V
DD
=
+5V
MAX5721 toc09
4
3
2
V
DD
= +3V
INL (LSB)
1
0
-1
-2
-3
-4
0
256
512
CODE
768
V
DD
= +5V
0.25
1.0
1024
0
256
512
CODE
768
1024
4
_______________________________________________________________________________________
10-Bit, Low-Power, Dual, Voltage-Output
DAC with Serial Interface
MAX5721
Typical Operating Characteristics (continued)
(V
REF
= V
DD
, T
A
= +25°C, unless otherwise noted.)
WORST-CASE INL AND DNL
vs. TEMPERATURE
MAX5721 toc10
SOURCE-AND-SINK CURRENT CAPABILITY
(V
DD
= +3V)
MAX5721 toc11
SOURCE-AND-SINK CURRENT CAPABILITY
(V
DD
= +5V)
4.5
4.0
3.5
V
OUT
(V)
3.0
2.5
2.0
1.5
1.0
CODE = 300 HEX,
SOURCING CURRENT
FROM OUT_
CODE = 100 HEX,
SINKING CURRENT
INTO OUT_
CODE = 000
SINKING CURRENT INTO OUT_
0
2
4
6
8
10
12
14
16
CODE = 3FF HEX, SOURCING
CURRENT FROM OUT_
MAX5721 toc12
MAX5721 toc15
4
3
2
INL AND DNL (LSB)
3.0
2.5
2.0
V
OUT
(V)
1.5
1.0
0.5
0
CODE = 300
HEX, SOURCING
CURRENT
FROM OUT_
CODE = 100 HEX,
SINKING CURRENT
INTO OUT_
CODE = 000
SINKING CURRENT INTO OUT_
0
2
4
6
8
10
12
14
CODE = 3FF
HEX, SOURCING
CURRENT
FROM OUT_
5.0
1
0
-1
MAXIMUM DNL
MAXIMUM INL
MINIMUM DNL
-2
-3
-4
-40 -20
0
20
40
MINIMUM INL
0.5
0
16
60
80
100 120
TEMPERATURE (°C)
I
SOURCE/SINK
(mA)
I
SOURCE/SINK
(mA)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX5721 toc13
POWER-DOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
POWER-DOWN SUPPLY CURRENT (nA)
MAX5721 toc14
SUPPLY CURRENT vs. CS INPUT VOLTAGE
900
800
SUPPLY CURRENT (µA)
700
600
500
400
300
200
100
V
DD
= +3V
V
DD
= +5V
160
140
SUPPLY CURRENT (µA)
120
100
80
60
40
20
0
2.7
3.2
3.7
4.2
4.7
5.2
SUPPLY VOLTAGE (V)
CODE = 3FF HEX
300
250
200
150
100
50
0
2.7
3.2
3.7
4.2
4.7
5.2
SUPPLY VOLTAGE (V)
0
0
1
2
3
4
5
CS INPUT VOLTAGE (V)
SUPPLY CURRENT
vs. TEMPERATURE
MAX5721 toc16
FULL-SCALE SETTLING TIME (V
DD
= +5V)
MAX5721 toc17
FULL-SCALE SETTLING TIME (V
DD
= +5V)
MAX5721 toc18
160
140
SUPPLY CURRENT (µA)
120
100
80
60
40
20
0
-40 -20
0
20
40
60
80
100 120
V
DD
= +3.6V
V
DD
= +5.5V
V
SCLK
5V/div
V
SCLK
5V/div
V
OUT
_
1V/div
CODE 000 TO 3FF HEX
R
L
= 5kΩ
C
L
= 200pF
1µs/div
CODE 3FF HEX TO 000
R
L
= 5kΩ
C
L
= 200pF
1µs/div
V
OUT
_
1V/div
TEMPERATURE (°C)
_______________________________________________________________________________________
5
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