19-1172; Rev 1; 10/02
+3V, Quad, 10-Bit Voltage-Output DAC
with Serial Interface
__________________General Description
The +3V MAX5251 combines four low-power, voltage-
output, 10-bit digital-to-analog converters (DACs) and
four precision output amplifiers in a space-saving, 20-
pin package. In addition to the four voltage outputs,
each amplifier’s negative input is also available to the
user. This facilitates specific gain configurations, remote
sensing, and high output drive capacity, making the
MAX5251 ideal for industrial-process-control applica-
tions. Other features include software shutdown, hard-
ware shutdown lockout, an active-low reset that clears
all registers and DACs to zero, a user-programmable
logic output, and a serial-data output.
Each DAC has a double-buffered input organized as an
input register followed by a DAC register. A 16-bit serial
word loads data into each input/DAC register. The
3-wire serial interface is compatible with SPI™/QSPI™
and MICROWIRE™. It allows the input and DAC regis-
ters to be updated independently or simultaneously with
a single software command. All logic inputs are
TTL/CMOS-logic compatible.
______________________________Features
o
Four 10-Bit DACs with Configurable
Output Amplifiers
o
+3.0V to +3.6V Single-Supply Operation
o
Low Supply Current: 0.8mA Normal Operation
3µA Shutdown Mode
o
Available in 20-Pin SSOP
o
Power-On Reset Clears all Registers and
DACs to Zero
o
SPI/QSPI and MICROWIRE Compatible
o
Simultaneous or Independent Control of DACs
Through 3-Wire Serial Interface
o
User-Programmable Digital Output
o
Schmitt-Trigger Digital Inputs for Direct
Optocoupler Interface
o
12-Bit Upgrade Available: MAX5253
MAX5251
_________________Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
INL
(LSB)
±1/2
±1
±1/2
±1
________________________Applications
Digital Offset and Gain Adjustment
Microprocessor-Controlled Systems
Industrial Process Controls
Automatic Test Equipment
Remote Industrial Controls
Motion Control
MAX5251ACPP 0°C to +70°C
20 Plastic DIP
MAX5251BCPP 0°C to +70°C
20 Plastic DIP
MAX5251ACAP 0°C to +70°C
20 SSOP
MAX5251BCAP 0°C to +70°C
20 SSOP
Ordering Information continued on last page.
Pin Configuration appears at end of data sheet.
_________________________________________________________________________Functional Diagram
DOUT CL
PDL
DECODE
CONTROL
INPUT
REGISTER A
DGND
AGND
V
DD
REFAB
FBA
MAX5251
DAC
REGISTER A
OUTA
DAC A
FBB
OUTB
DAC B
FBC
OUTC
DAC C
FBD
OUTD
DAC D
16-BIT
SHIFT
REGISTER
INPUT
REGISTER B
DAC
REGISTER B
INPUT
REGISTER C
DAC
REGISTER C
SR
CONTROL
CS DIN SCLK
LOGIC
OUTPUT
UPO
INPUT
REGISTER D
DAC
REGISTER D
REFCD
SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
________________________________________________________________
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.
+3V, Quad, 10-Bit Voltage-Output DAC
with Serial Interface
MAX5251
ABSOLUTE MAXIMUM RATINGS
V
DD
to AGND............................................................-0.3V to +6V
V
DD
to DGND ...........................................................-0.3V to +6V
AGND to DGND ..................................................................±0.3V
REFAB, REFCD to AGND ...........................-0.3V to (V
DD
+ 0.3V)
OUT_, FB_ to AGND...................................-0.3V to (V
DD
+ 0.3V)
Digital Inputs to DGND.............................................-0.3V to +6V
DOUT, UPO to DGND ................................-0.3V to (V
DD
+ 0.3V)
Continuous Current into Any Pin.......................................±20mA
Continuous Power Dissipation (T
A
= +70°C)
Plastic DIP (derate 8.00mW/°C above +70°C) .................640mW
SSOP (derate 8.00mW/°C above +70°C) ......................640mW
CERDIP (derate 11.11mW/°C above +70°C) .................889mW
Operating Temperature Ranges
MAX5251_C_P ......................................................0°C to +70°C
MAX5251_E_P ...................................................-40°C to +85°C
MAX5251BMJP ................................................-55°C to +125°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
= +3.0V to +3.6V, AGND = DGND = 0V, REFAB = REFCD = 1.25V, R
L
= 5kΩ, C
L
= 100pF, T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at T
A
= +25°C. Output buffer connected in unity-gain configuration (Figure 9).)
PARAMETER
Resolution
Integral Nonlinearity
(Note 1)
Differential Nonlinearity
Offset Error
Offset-Error Tempco
Gain Error
Gain-Error Tempco
Power-Supply Rejection Ratio
Reference Input Range
Reference Input Resistance
PSRR
V
REF
R
REF
Code dependent, minimum at code 554 hex
V
DD
= +3.0V to +3.6V
0
8
REFERENCE INPUT
MATCHING PERFORMANCE
(T
A
= +25°C)
V
DD
- 1.4
V
kΩ
GE
(Note 1)
1
100
800
SYMBOL
N
MAX5251AC/E
INL
DNL
V
OS
6
±2.4
MAX5251BC/E
MAX5251BMJP
Guaranteed monotonic
CONDITIONS
MIN
10
±0.25
±0.5
±1.0
±2.0
±1.0
±6.0
LSB
mV
ppm/°C
LSB
ppm/°C
µV/V
LSB
TYP
MAX
UNITS
Bits
STATIC PERFORMANCE—ANALOG SECTION
2
_______________________________________________________________________________________
+3V, Quad, 10-Bit Voltage-Output DAC
with Serial Interface
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +3.0V to +3.6V, AGND = DGND = 0V, REFAB = REFCD = 1.25V, R
L
= 5kΩ, C
L
= 100pF, T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at T
A
= +25°C. Output buffer connected in unity-gain configuration (Figure 9).)
PARAMETER
Reference -3dB Bandwidth
Reference Feedthrough
Signal-to-Noise Plus
Distortion Ratio
DIGITAL INPUTS
Input High Voltage
Input Low Voltage
Input Leakage Current
Input Capacitance
DIGITAL OUTPUTS
Output High Voltage
Output Low Voltage
DYNAMIC PERFORMANCE
Voltage Output Slew Rate
Output Settling Time
Output Voltage Swing
Current into FB_
OUT_ Leakage Current
in Shutdown
Start-Up Time Exiting
Shutdown Mode
Digital Feedthrough
Digital Crosstalk
POWER SUPPLIES
Supply Voltage
Supply Current
Supply Current in Shutdown
Reference Current in Shutdown
Rail-to-Rail is a registered trademark of Motorola Nippon Ltd.
Note 1:
Note 2:
Note 3:
Note 4:
Guaranteed from code 5 to code 1023 in unity-gain configuration.
Accuracy is better than 1LSB for V
OUT
= 6mV to V
DD
- 80mV, guaranteed by PSR test at the endpoints.
Remains operational with supply voltage as low as +2.7V.
R
L
=
∞,
digital inputs at DGND or V
DD
.
V
DD
I
DD
(Note 3)
(Note 4)
(Note 4)
3.0
0.82
3
0.01
3.6
0.98
20
±1
V
mA
µA
µA
CS
= V
DD
, DIN = 100kHz
R
L
=
∞
SR
To ±1/2LSB, V
STEP
= 1.25V
Rail-to-Rail
®
(Note 2)
0.6
12
0 to V
DD
0
0.01
20
5
5
0.1
±1
V/µs
µs
V
µA
µA
µs
nV-s
nV-s
V
OH
V
OL
I
SOURCE
= 2mA
I
SINK
= 2mA
V
DD
- 0.5
0.13
0.4
V
V
V
IH
V
IL
I
IN
C
IN
V
IN
= 0V or V
DD
0.01
8
2.0
0.6
±1.0
V
V
µA
pF
SINAD
SYMBOL
CONDITIONS
V
REF
= 0.67V
P-P
Input code = all 0s, V
REF
= 1.6V
P-P
at 1kHz
V
REF
= 1V
P-P
at 25kHz, code = full scale
MIN
TYP
650
-84
72
MAX
UNITS
kHz
dB
dB
MULTIPLYING-MODE PERFORMANCE
MAX5251
_______________________________________________________________________________________
3
+3V, Quad, 10-Bit Voltage-Output DAC
with Serial Interface
MAX5251
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +3.0V to +3.6V, AGND = DGND = 0V, REFAB = REFCD = 1.25V, R
L
= 5kΩ, C
L
= 100pF, T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at T
A
= +25°C. Output buffer connected in unity-gain configuration (Figure 9).)
PARAMETER
SCLK Clock Period
SCLK Pulse Width High
SCLK Pulse Width Low
CS
Fall to SCLK Rise Setup Time
SCLK Rise to
CS
Rise Hold Time
DIN Setup Time
DIN Hold Time
SCLK Rise to DOUT Valid
Propagation Delay
SCLK Fall to DOUT Valid
Propagation Delay
SCLK Rise to
CS
Fall Delay
CS
Rise to SCLK Rise Hold Time
CS
Pulse Width High
SYMBOL
t
CP
t
CH
t
CL
t
CSS
t
CSH
t
DS
t
DH
t
D01
t
D02
t
CS0
t
CS1
t
CSW
C
L
= 200pF
C
L
= 200pF
40
40
100
CONDITIONS
MIN
100
100
40
40
40
0
40
0
120
120
TYP
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
TIMING CHARACTERISTICS
(Figure t6)
SCLK Clock Period
CP
__________________________________________Typical Operating Characteristics
(V
DD
= +3.3V, T
A
= +25°C, unless otherwise noted.)
INTEGRAL NONLINEARITY
vs. REFERENCE VOLTAGE
MAX5251-01
REFERENCE VOLTAGE INPUT
FREQUENCY RESPONSE
MAX5251-06
SUPPLY CURRENT
vs. TEMPERATURE
950
900
SUPPLY CURRENT (µA)
850
800
750
700
650
600
550
CODE = FFC HEX
500
-55 -40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
MAX5251-04
0.25
0
-0.25
INL (LSB)
-0.50
-0.75
-1.00
R
L
= 5kΩ
-1.25
0
0.5
1.0
1.5
2.0
REFERENCE VOLTAGE (V)
0
REFAB SWEPT 0.67V
P-P
R
L
= 5kΩ
C
L
= 100pF
1000
-4
RELATIVE OUTPUT (dB)
2.5
-8
-12
-16
-20
0
500k 1.0M 1.5M
2.0M 2.5M 3.0M
FREQUENCY (Hz)
4
_______________________________________________________________________________________
+3V, Quad, 10-Bit Voltage-Output DAC
with Serial Interface
____________________________Typical Operating Characteristics (continued)
(V
DD
= +3.3V, T
A
= +25°C, unless otherwise noted.)
MAX5251
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX5251-05
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX5251-02
OUTPUT FFT PLOT
V
REF
= 1kHz, 0.006V TO 1.6V
R
L
= 5kΩ
C
L
= 100pF
MAX5251-10
1000
950
SUPPLY CURRENT (µA)
900
0.50
0.45
0.40
THD + NOISE (%)
0.35
0.30
0.25
0.20
0.15
0.10
DAC CODE = FULL SCALE
REFAB = 1V
P-P
R
L
= 5kΩ
C
L
= 100pF
0
850
800
750
700
650
600
550
500
2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6
SUPPLY VOLTAGE (V)
CODE = FFC HEX
SIGNAL AMPLITUDE (dB)
-20
-40
-60
-80
0.05
0
0.1
1
10
100
FREQUENCY (kHz)
-100
0.5
1.6
2.7
3.8
4.9
6.0
FREQUENCY (kHz)
FULL-SCALE ERROR
vs. LOAD
MAX5251-03
REFERENCE FEEDTHROUGH
AT 1kHz
REFAB INPUT SIGNAL
V
REF
= 1.6V
P-P
AT 1kHz
R
L
= 5kΩ
C
L
= 100pF
MAX5251-11
0
0
FULL-SCALE ERROR (LSB)
-1.0
SIGNAL AMPLITUDE (dB)
-0.5
-20
-40
-1.5
-60
OUTA FEEDTHROUGH
-2.0
-80
-2.5
0.01
0.1
1
LOAD (kΩ)
10
100
-100
0.5
1.2
1.9
2.6
3.3
4.0
FREQUENCY (kHz)
_______________________________________________________________________________________
5
测试/测量
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