19-2124; Rev 2; 7/03
12-Bit, Low-Power, Dual, Voltage-Output
DAC with Serial Interface
General Description
The MAX5722 dual,12-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 accommodates low-power and
low-voltage applications. DAC outputs employ on-chip
precision output amplifiers that swing Rail-to-Rail
®
. The
MAX5722’s reference input accepts a voltage range
from 0 to V
DD
. In power-down, the reference input is
high impedance, further reducing the system’s total
power consumption.
The 20MHz, 3-wire SPI™, QSPI™, MICROWIRE™, and
DSP-compatible serial interface save board space and
reduce the complexity of opto- and transformer-isolated
applications. The MAX5722 on-chip power-on reset
(POR) circuit resets the DAC outputs to zero and loads
the output with a 100kΩ resistor to ground. This pro-
vides additional safety for applications that drive valves
or other transducers that need to be off on power-up.
The MAX5722’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 MAX5722 is
specified over the -40°C to +125°C automotive temper-
ature range.
o
Ultra-Low Power Consumption
112µA at V
DD
= +3.6V
135µA at V
DD
= +5.5V
o
Wide +2.7V to +5.5V Single-Supply Range
o
8-Pin µMAX Package
o
0.3µA Power-Down Current
o
Guaranteed 12-Bit Monotonicity (±1LSB DNL)
o
Safe Power-Up Reset to Zero Volts at DAC Output
o
Three Software-Selectable Power-Down
Impedances (100kΩ, 1kΩ, Hi-Z)
o
Fast 20MHz, 3-Wire SPI, QSPI, and MICROWIRE-
Compatible Serial Interface
o
Rail-to-Rail Output Buffer Amplifiers
o
Schmitt-Triggered Logic Inputs for Direct
Interfacing to Optocouplers
o
Wide -40°C to +125°C Operating Temperature
Range
Features
MAX5722
Applications
Automatic Tuning
Gain and Offset Adjustment
Power Amplifier Control
Process Control I/O Boards
Battery-Powered Instruments
VCO Control
TOP VIEW
PART
MAX5722EUA
MAX5722AUA
Ordering Information
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.
Rail-to-Rail is a registered trademark of Nippon Motorola, Inc.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor, Corp.
V
DD
GND
CS
1
2
8
7
OUTB
OUTA
REF
DIN
MAX5722
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.
12-Bit, Low-Power, Dual, Voltage-Output
DAC with Serial Interface
MAX5722
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
Integral Nonlinearity Error
Differential Nonlinearity Error
Zero-Code Error
Zero-Code Tempco
Gain Error
Gain-Error Tempco
Power-Supply Rejection Ratio
REFERENCE INPUT
Reference Input Voltage Range
Reference Input Impedance
Power-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 = 800 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 = FFF hex,
∆V
DD
=
±10%
GE
Code = FFF hex
0.26
58.8
N
INL
DNL
OE
(Note 2)
Guaranteed monotonic (Note 2)
Code = 000
0.4
2.3
±3
12
±2
±16
±1
1.5
Bits
LSB
LSB
% of FS
ppm/°C
% of FS
ppm/°C
dB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
12-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 Impulse
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
400 hex to C00 hex (Note 5)
Any digital inputs from 0 to V
DD
Major carry transition (code 7FF hex to code
800 hex)
0.5
4
0.15
12
2.4
10
V/µs
µs
nV-s
nV-s
nV-s
V
IH
V
IL
I
IN
C
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
MAX5722
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 is guaranteed from code 115 to code 3981.
Limited with test conditions.
Offset and gain error limit the FSR.
Guaranteed by design.
_______________________________________________________________________________________
3
12-Bit, Low-Power, Dual, Voltage-Output
DAC with Serial Interface
MAX5722
Typical Operating Characteristics
(V
REF
= V
DD
, T
A
= +25°C, unless otherwise noted.)
INTEGRAL NONLINEARITY vs.
CODE, T
A
= +25°C
MAX5722 toc01
DIFFERENTIAL NONLINEARITY vs.
CODE, T
A
= +25°C
MAX5722 toc02
TOTAL UNADJUSTED ERROR vs.
CODE, T
A
= +25°C
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
V
DD
= +5V
0
512 1024 1536 2048 2560 3072 3584 4096
CODE
V
DD
= +3V
MAX5722 toc03
16
12
8
INL (LSB)
1.0
0.8
0.6
0.4
DNL (LSB)
0.2
0
-0.2
-0.4
1.0
TOTAL UNADJUSTED ERROR (%)
4
0
-4
-8
-12
-16
0
V
DD
= +5V
V
DD
= +3V
-0.6
-0.8
-1.0
512 1024 1536 2048 2560 3072 3584 4096
CODE
0
512 1024 1536 2048 2560 3072 3584 4096
CODE
INTEGRAL NONLINEARITY vs.
CODE, T
A
= -40°C
MAX5722 toc04
DIFFERENTIAL NONLINEARITY vs.
CODE, T
A
= -40°C
MAX5722 toc05
TOTAL UNADJUSTED ERROR vs.
CODE, T
A
= -40°C
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
V
DD
= +5V
0
512 1024 1536 2048 2560 3072 3584 4096
CODE
V
DD
= +3V
MAX5722 toc06
16
12
8
1.0
0.8
0.6
0.4
DNL (LSB)
0.2
0
-0.2
-0.4
-0.6
1.0
TOTAL UNADJUSTED ERROR (%)
INL (LSB)
4
0
-4
-8
-12
-16
0
V
DD
= +5V
V
DD
= +3V
-0.8
512 1024 1536 2048 2560 3072 3584 4096
CODE
-1.0
0
512 1024 1536 2048 2560 3072 3584 4096
CODE
INTEGRAL NONLINEARITY vs.
CODE, T
A
= +125°C
MAX5722 toc07
DIFFERENTIAL NONLINEARITY vs.
CODE, T
A
= +125°C
MAX5722 toc08
TOTAL UNADJUSTED ERROR vs.
CODE, T
A
= +125°C
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
V
DD
= +5V
0
512 1024 1536 2048 2560 3072 3584 4096
CODE
V
DD
= +3V
MAX5722 toc09
16
12
8
1.0
0.8
0.6
0.4
DNL (LSB)
0.2
0
-0.2
-0.4
1.0
TOTAL UNADJUSTED ERROR (%)
INL (LSB)
4
0
-4
-8
-12
-16
0
V
DD
= +5V
V
DD
= +3V
-0.6
-0.8
-1.0
512 1024 1536 2048 2560 3072 3584 4096
CODE
0
512 1024 1536 2048 2560 3072 3584 4096
CODE
4
_______________________________________________________________________________________
12-Bit, Low-Power, Dual, Voltage-Output
DAC with Serial Interface
MAX5722
Typical Operating Characteristics (continued)
(V
REF
= V
DD
, T
A
= +25°C, unless otherwise noted.)
WORST CASE INL AND DNL
vs. TEMPERATURE
MAX5722 toc10
SOURCE-AND-SINK CURRENT CAPABILITY
(V
DD
= +3V)
MAX5722 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 = C00 HEX,
SOURCING CURRENT
FROM OUT_
CODE = 400 HEX,
SINKING CURRENT
INTO OUT_
CODE = 000 HEX,
SINKING CURRENT INTO OUT_
0
5
10
15
20
25
30
35
40
CODE = FFF HEX, SOURCING
CURRENT FROM OUT_
MAX5722 toc12
MAX5722 toc15
16
12
8
INL AND DNL (LSB)
MAXIMUM INL
3.0
2.5
2.0
V
OUT
(V)
1.5
1.0
CODE = C00
HEX, SOURCING
CURRENT
FROM OUT_
CODE = 400 HEX,
SINKING CURRENT
INTO OUT_
CODE = 000 HEX,
SINKING CURRENT INTO OUT_
0
2
4
6
8
10
12
14
CODE = FFF
HEX, SOURCING
CURRENT
FROM OUT_
5.0
4
0
-4
-8
-12
-16
-40
-20
MAXIMUM DNL
MINIMUM DNL
MINIMUM INL
0.5
0
0
40 60 80
TEMPERATURE (°C)
20
100 120
0.5
0
16
I
SOURCE/SINK
(mA)
I
SOURCE/SINK
(mA)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX5722 toc13
POWER-DOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
POWER-DOWN SUPPLY CURRENT (nA)
MAX5722 toc14
SUPPLY CURRENT vs.
CS INPUT VOLTAGE
900
800
SUPPLY CURRENT (µA)
700
600
500
400
300
200
V
DD
= +3V
V
DD
= +5V
160
140
SUPPLY CURRENT (µA)
120
100
CODE = 3FF HEX
80
60
40
20
0
2.7
3.2
3.7
4.2
4.7
5.2
SUPPLY VOLTAGE (V)
300
250
200
150
100
50
100
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
MAX5722 toc16
FULL-SCALE SETTLING TIME
(V
DD
= +5V)
160
140
SUPPLY CURRENT (µA)
120
100
80
60
40
20
0
-40 -20
0
20
40
60
80
100 120
V
DD
= +5V
V
DD
= +3V
MAX5722 toc17
FULL-SCALE SETTLING TIME
(V
DD
= +5V)
MAX5722 toc18
V
SCLK
5V/div
V
SCLK
5V/div
CODE 000 TO FFF HEX
R
L
= 5kΩ
C
L
= 200pF
1µs/div
V
OUT_
1V/div
CODE FFF HEX TO 000
R
L
= 5kΩ
C
L
= 200pF
V
OUT_
1V/div
1µs/div
TEMPERATURE (°C)
_______________________________________________________________________________________
5
单片机
