19-3988; Rev 0; 2/06
Dual, 10-Bit, Current-Sink Output DAC
General Description
The MAX5547 dual, 10-bit, dual range, digital-to-analog
converter (DAC) sinks up to 3.6mA of current, making it
ideal for laser-driver-control applications. Parallel the
MAX5547 outputs to sink higher current (up to 7.2mA
max). Operating from a single +2.7V to +5.25V
supply, the MAX5547 typically consumes 1mA
(internal reference).
The MAX5547 operates from a precision +2.5V internal
4ppm/°C reference or an external reference in the
+2.45V to +2.55V range. The maximum full-scale cur-
rent-sink range is software programmable to 3.6mA or
1.2mA for each DAC. A 10MHz SPI™-compatible serial
interface configures the device.
The MAX5547 is available in a 3mm x 3mm x 0.8mm 8-
pin TDFN package and is specified over the -40°C to
+85°C extended temperature range.
♦
Dual Current-Sink DACs
♦
10-Bit Resolution
♦
Two Software-Programmable Full-Scale Current
Ranges: 3.6mA or 1.2mA
♦
Parallelable Outputs for Up to 7.2mA (max)
♦
+2.5V Internal Reference Drifts Only 4ppm/°C
♦
+2.7V to +5.25V Single-Supply Operation
♦
INL: ±4 LSB (1.2mA Output)
♦
DNL: ±0.75 LSB (Guaranteed Monotonic)
♦
Low +0.8V Output Compliance
♦
Ultra-Small, 3mm x 3mm x 0.8mm, 8-Pin TDFN
Package
Features
MAX5547
Applications
Laser-Driver Control
Pin-Diode Bias Currents
Modulation Currents
Average Power
Extinction Ratios
PART
Ordering Information
TEMP RANGE
PIN-
PACKAGE
TOP
MARK
APF
PKG
CODE
T833-2
MAX5547ETA -40°C to +85°C 8 TDFN-EP*
*EP
= Exposed pad.
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
+2.5V
+2.7V TO +5.25V
+3.3V
+3.3V
REF
V
DD
I
OUTA
MODSET
V
CC
OUT-
MAX5547
MAX3736
OUT+
I
OUTB
BIASSET
BIAS
FERRITE
BEAD
DIS
BC_MON
CS
DIN
SCLK
GND
GND
+3.3V
CS
REF
GND
MOSI
SCLK
V
CC
AIN0
AIN1
AIN2
+3.3V
MICROCONTROLLER WITH ADC
I/O2
I/O3
I/O1
TX_DISABLE
MOD-DEF1
MOD-DEF2
SPI is a trademark of Motorola, 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, Current-Sink Output DAC
MAX5547
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND .............................................................-0.3V to +6V
OUTA, OUTB, REF to GND ........................-0.3V to (V
DD
+ 0.3V)
SCLK, DIN,
CS
to GND ............................................-0.3V to +6V
Continuous Power Dissipation (T
A
= +70°C)
8-Pin TDFN (derate 18.2mW/°C above +70°C) .......1454.5mW
Operating Temperature Range ...........................-40°C to +85°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
= +2.7 to +5.25V, GND = 0, external reference = +2.5V, output voltage = +2.0V, T
A
= -40°C to +85°C. Typical values are at
V
DD
= +3.0V, and T
A
= +25°C.) (Note 1)
PARAMETER
Resolution
Integral Nonlinearity (Note 2)
Differential Nonlinearity
Offset Error
Offset Temperature Coefficent
Gain Error
Gain Temperature Coefficient
Line Regulation
Output Crosstalk
REFERENCE
Internal-Reference Voltage
Internal-Reference Temperature
Coefficient
Internal-Reference Load
Regulation
Internal-Reference Power-Up
Time
Internal-Reference Sink Current
Internal-Reference Source
Current
REF Capacitive Load
Reference Line Regulation
Internal-Reference Noise
External-Reference Range
V
REF
(Note 3)
V
DD
= +2.7V to +5.25V
f = 0.1Hz to 10Hz
f = 10Hz to 10kHz
2.45
0.1
25
10
27
2.55
V
REF
T
A
= +25°C
(Note 3)
0µA < I
REF
< +300µA
C
REF
= 1µF, to 0.05%
2.48
2.5
4
1
0.55
50
300
10.0
2.52
35
3.5
V
ppm/°C
Ω
ms
µA
µA
µF
µV/V
µV
RMS
V
GE
Measured from code
030h to 3FFh
I
OUT_
= 1.2mA
I
OUT_
= 3.6mA
V
DD
= +2.7V to +5.25V
OUTA = midscale, OUTB switching from
030h to 3FFh
54
I
OUT
= 1.2mA
I
OUT
= 3.6mA
INL
DNL
OE
I
OUT
_ = 1.2mA
I
OUT
_ = 3.6mA
Guaranteed monotonic
Code = 030h
±4
0.05
±0.1
±0.1
15
25
0.8
±3
±5.5
SYMBOL
CONDITIONS
MIN
10
±4
±6
±0.75
TYP
MAX
UNITS
Bits
LSB
LSB
LSB
LSB/°C
%
ppm/°C
LSB/V
dB
STATIC PERFORMANCE—ANALOG SECTION
2
_______________________________________________________________________________________
Dual, 10-Bit, Current-Sink Output DAC
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7 to +5.25V, GND = 0, external reference = +2.5V, output voltage = +2.0V, T
A
= -40°C to +85°C. Typical values are at
V
DD
= +3.0V, and T
A
= +25°C.) (Note 1)
PARAMETER
External-Reference Input
Impedance
DAC OUTPUTS
1.2mA low-current
range
Output Current (Note 4)
I
OUT
_
3.6mA high-current
range
1.2mA full-scale current
3.6mA full-scale current
I
OUT
_ = full-scale (Note 5)
I
OUT
_ = 1.2mA
I
OUT
_ = 3.6mA
t
S
I
RMS
To 1% (Note 6)
f = 0.1Hz to 10Hz
f = 10Hz to 10kHz
100mV, 1kHz signal added to V
DD
R
LOAD
= 500Ω, C
LOAD
= 100pF
R
LOAD
= 500Ω, C
LOAD
= 100pF
0.8
800
180
10
0.05
0.35
0.85
2
16
2
Code = 030h
Code = 3FFh
Code = 030h
Code = 3FFh
3400
1170
50
1200
150
3600
1.17
3.52
V
DD
3800
µA
V
kΩ
1230
µA
SYMBOL
R
REF
CONDITIONS
MIN
TYP
90
MAX
UNITS
kΩ
MAX5547
LSB Size
Current-Source Compliance
Voltage Range
Output Impedance at Full-Scale
Current
DYNAMIC PERFORMANCE
Settling Time
Output Noise
Supply Feedthrough
Digital Feedthrough
Digital-to-Analog Glitch Impulse
DAC-to-DAC Full-Scale Current
Matching
POWER SUPPLIES
Supply Voltage
V
DD
I
DD
µs
LSB
RMS
LSB/V
pA
·
s
pA
·
s
%
+2.70
V
DD
= +5.25V, no load,
SCLK not switching
Internal reference
mode
External reference
mode
0.7 x
V
DD
1.1
0.75
+5.25
2
V
Supply Current
mA
1.5
LOGIC AND CONTROL INPUTS
Input High Voltage
Input Low Voltage
Input Hysteresis
Input Capacitance
Input Leakage Current
V
IH
V
IL
V
HYS
C
IN
I
IN
(Note 7)
(Note 7)
0.05 x
V
DD
10
±1
V
0.8
V
V
pF
µA
_______________________________________________________________________________________
3
Dual, 10-Bit, Current-Sink Output DAC
MAX5547
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7 to +5.25V, GND = 0, external reference = +2.5V, output voltage = +2.0V, T
A
= -40°C to +85°C. Typical values are at
V
DD
= +3.0V, and T
A
= +25°C.) (Note 1)
PARAMETER
SCLK Clock Period
SCLK Pulse-Width High
SCLK Pulse-Width Low
CS
Fall to SCLK Fall Setup Time
SCLK Fall to
CS
Rise Hold Time
DIN to SCLK Fall Setup Time
DIN to SCLK Fall Hold Time
CS
Pulse-Width High
SYMBOL
t
CP
t
CH
t
CL
t
CSS
t
CSH
t
DS
t
DH
t
CSW
CONDITIONS
MIN
100
40
40
25
50
40
0
100
TYP
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
SPI TIMING CHARACTERISTICS (see Figure 1)
Note 1:
Note 2:
Note 3:
Note 4:
Devices are 100% production tested at T
A
= +25°C. Limits over temperature are guaranteed by design.
INL linearity is from code 48 to code 1023.
Guaranteed by design. Not production tested.
The DACs continue to operate at currents lower than 50µA on the 1.2mA range and 150µA on the 3.6mA range. However,
performance is not guaranteed at these low currents. A code of all zeros has a nominal output current of 0µA.
Note 5:
Compliance voltage range is defined as the range where the output current is -2 LSB of its value at V
OUT
= +1V.
Note 6:
Settling time is measured from 0.25 x full scale to 0.75 x full scale.
Note 7:
The device draws higher supply current when the digital inputs are driven with voltages between (V
DD
- 0.5V) and (GND +
0.5V). See Supply Current vs. Digital Input Voltage in the
Typical Operating Characteristics.
Typical Operating Characteristics
(V
DD
= +3.0V, GND = 0, external reference = +2.5V, T
A
= +25°C, unless otherwise noted.)
INTEGRAL NONLINEARITY
vs. DIGITAL INPUT CODE (1.2mA SETTING)
MAX5547 toc01
INTEGRAL NONLINEARITY
vs. DIGITAL INPUT CODE (3.6mA SETTING)
MAX5547 toc02
DIFFERENTIAL NONLINEARITY
vs. DIGITAL INPUT CODE (1.2mA SETTING)
0.75
0.50
DNL (LSB)
0.25
0
-0.25
-0.50
-0.75
-1.00
MAX5547 toc03
4
3
2
INL (LSB)
4
3
2
INL (LSB)
1
0
-1
-2
-3
-4
1.00
1
0
-1
-2
-3
-4
0
256
512
768
1024
DIGITAL INPUT CODE
0
256
512
768
1024
0
256
512
768
1024
DIGITAL INPUT CODE
DIGITAL INPUT CODE
4
_______________________________________________________________________________________
Dual, 10-Bit, Current-Sink Output DAC
MAX5547
Typical Operating Characteristics (continued)
(V
DD
= +3.0V, GND = 0, external reference = +2.5V, T
A
= +25°C, unless otherwise noted.)
DIFFERENTIAL NONLINEARITY
vs. DIGITAL INPUT CODE (3.6mA SETTING)
MAX5547 toc04
MAXIMUM INTEGRAL NONLINEARITY
vs. TEMPERATURE (3.6mA SETTING)
MAX5547 toc05
MAXIMUM DIFFERENTIAL NONLINEARITY
vs. TEMPERATURE (3.6mA SETTING)
MAX5547 toc06
1.00
0.75
0.50
DNL (LSB)
8
0.6
0.5
0.4
DNL (LSB)
6
INL (LSB)
0.25
0
-0.25
-0.50
-0.75
-1.00
0
256
512
768
1024
DIGITAL INPUT CODE
4
0.3
0.2
2
0.1
0
-40
-15
10
35
60
85
TEMPERATURE (°C)
0
-40
-15
10
35
60
85
TEMPERATURE (°C)
ZERO-SCALE SINK CURRENT
vs. TEMPERATURE
MAX5547 toc07
FULL-SCALE SINK CURRENT
vs. TEMPERATURE (1.2mA SETTING)
MAX5547 toc08
FULL-SCALE SINK CURRENT
vs. TEMPERATURE (3.6mA SETTING)
MAX5547 toc09
20
1.210
1.208
FULL-SCALE CURRENT (mA)
1.206
1.204
1.202
1.200
1.198
3.80
3.75
3.70
3.65
3.60
3.55
3.50
15
3.6mA FULL SCALE
10
5
1.2mA FULL SCALE
0
-40
-15
10
35
60
85
TEMPERATURE (°C)
1.196
-40
-15
10
35
60
85
TEMPERATURE (°C)
FULL-SCALE CURRENT (mA)
ZERO-SCALE CURRENT (µA)
-40
-15
10
35
60
85
TEMPERATURE (°C)
INTERNAL REFERENCE VOLTAGE
vs. SUPPLY VOLTAGE
MAX5547 toc10
INTERNAL REFERENCE
VOLTAGE vs. TEMPERATURE
MAX5547 toc11
SUPPLY CURRENT vs. SUPPLY VOLTAGE
EXTERNAL REFERENCE = 2.5V,
CS
= SCLK = DIN = GND
MAX5547 toc12
2.4960
INTERNAL REFERENCE VOLTAGE (V)
2.4940
INTERNAL REFERENCE VOLTAGE (V)
502
500
498
2.4958
2.4935
I
DD
(µA)
-40
-15
10
35
60
85
2.4956
2.4930
496
494
2.4954
2.4925
492
2.4920
490
2.5
3.0
3.5
4.0
4.5
5.0
5.5
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
2.4952
2.4950
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
5
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