Rainbow Electronics MAX5547 User Manual
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 current-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 8pin TDFN package and is specified over the -40°C to
+85°C extended temperature range.
Applications
Laser-Driver Control
Pin-Diode Bias Currents
Modulation Currents
Average Power
Extinction Ratios
Features
♦ 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
MAX5547
Dual, 10-Bit, Current-Sink Output DAC
________________________________________________________________ Maxim Integrated Products 1
19-3988; Rev 0; 2/06
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.
Ordering Information
+2.7V TO +5.25V
+2.5V
+3.3V
OUTA
OUTB
CS
DIN
SCLK
MICROCONTROLLER WITH ADC
REF
I
I
BIASSET
MODSET
DIS
BC_MON
OUT-
OUT+
BIAS
AIN0
AIN1
AIN2
CS
MOSI SCLK
GND
GND
V
CC
REF
FERRITE
BEAD
I/O1
I/O2
I/O3
TX_DISABLE
MOD-DEF1
MOD-DEF2
+3.3V
GND
V
CC
+3.3V
+3.3V
MAX5547 MAX3736
V
DD
Typical Operating Circuit
PART
TEMP RANGE
PIN-
TOP
PKG
CODE
MAX5547ETA
T833-2
SPI is a trademark of Motorola, Inc.
*EP = Exposed pad.
Pin Configuration appears at end of data sheet.
PACKAGE
-40°C to +85°C 8 TDFN-EP* APF
MARK
MAX5547
Dual, 10-Bit, Current-Sink Output DAC
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
VDDto 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
ELECTRICAL CHARACTERISTICS
(VDD= +2.7 to +5.25V, GND = 0, external reference = +2.5V, output voltage = +2.0V, TA= -40°C to +85°C. Typical values are at
V
DD
= +3.0V, and TA= +25°C.) (Note 1)
PARAMETER
CONDITIONS
UNITS
STATIC PERFORMANCE—ANALOG SECTION
Resolution 10 Bits
I
OUT
_ = 1.2mA ±4
Integral Nonlinearity (Note 2) INL
I
OUT
_ = 3.6mA ±6
LSB
Differential Nonlinearity DNL Guaranteed monotonic
LSB
Offset Error OE Code = 030h ±4 LSB
Offset Temperature Coefficent
LSB/°C
I
OUT
= 1.2mA
±3
Gain Error GE
Measured from code
030h to 3FFh
I
OUT
= 3.6mA
%
I
OUT_
= 1.2mA 15
Gain Temperature Coefficient
I
OUT_
= 3.6mA 25
ppm/°C
Line Regulation VDD = +2.7V to +5.25V 0.8
LSB/V
Output Crosstalk
OUTA = midscale, OUTB switching from
030h to 3FFh
54 dB
REFERENCE
Internal-Reference Voltage V
REF
TA = +25°C
2.5
V
Internal-Reference Temperature
Coefficient
(Note 3) 4 35
ppm/°C
Internal-Reference Load
Regulation
0µA < I
REF
< +300µA 1 3.5 Ω
Internal-Reference Power-Up
Time
C
REF
= 1µF, to 0.05%
ms
Internal-Reference Sink Current 50 µA
Internal-Reference Source
Current
µA
REF Capacitive Load (Note 3) 0.1
µF
Reference Line Regulation VDD = +2.7V to +5.25V 25
µV/V
f = 0.1Hz to 10Hz 10
Internal-Reference Noise
f = 10Hz to 10kHz 27
µV
RMS
External-Reference Range V
REF
V
SYMBOL
MIN TYP MAX
2.48
2.45 2.55
0.05
±0.1
±0.1 ±5.5
0.55
±0.75
2.52
300
10.0
MAX5547
Dual, 10-Bit, Current-Sink Output DAC
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VDD= +2.7 to +5.25V, GND = 0, external reference = +2.5V, output voltage = +2.0V, TA= -40°C to +85°C. Typical values are at
V
DD
= +3.0V, and TA= +25°C.) (Note 1)
PARAMETER
CONDITIONS
UNITS
External-Reference Input
Impedance
R
REF
90 kΩ
DAC OUTPUTS
Code = 030h 50
1.2mA low-current
range
Code = 3FFh
Code = 030h 150
Output Current (Note 4) I
OUT
_
3.6mA high-current
range
Code = 3FFh
µA
1.2mA full-scale current
LSB Size
3.6mA full-scale current
µA
Current-Source Compliance
Voltage Range
I
OUT
_ = full-scale (Note 5) 0.8
V
I
OUT
_ = 1.2mA 800
Output Impedance at Full-Scale
Current
I
OUT
_ = 3.6mA 180
kΩ
DYNAMIC PERFORMANCE
Settling Time t
S
To 1% (Note 6) 10 µs
f = 0.1Hz to 10Hz
Output Noise I
RMS
f = 10Hz to 10kHz
LSB
RMS
Supply Feedthrough 100mV, 1kHz signal added to V
DD
LSB/V
Digital Feedthrough R
LOAD
= 500Ω, C
LOAD
= 100pF 2
pA·s
Digital-to-Analog Glitch Impulse R
LOAD
= 500Ω, C
LOAD
= 100pF 16
pA·s
DAC-to-DAC Full-Scale Current
Matching
2%
POWER SUPPLIES
Supply Voltage V
DD
V
Internal reference
mode
1.1 2
Supply Current I
DD
VDD = +5.25V, no load,
SCLK not switching
External reference
mode
1.5
mA
LOGIC AND CONTROL INPUTS
Input High Voltage V
IH
(Note 7)
0.7 x
V
Input Low Voltage V
IL
(Note 7) 0.8 V
Input Hysteresis V
HYS
0.05 x
V
Input Capacitance C
IN
10 pF
Input Leakage Current I
IN
±1 µA
SYMBOL
MIN TYP MAX
1170 1200 1230
3400 3600 3800
1.17
3.52
0.05
0.35
0.85
+2.70 +5.25
0.75
V
DD
V
DD
V
DD
MAX5547
Dual, 10-Bit, Current-Sink Output DAC
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(VDD= +2.7 to +5.25V, GND = 0, external reference = +2.5V, output voltage = +2.0V, TA= -40°C to +85°C. Typical values are at
V
DD
= +3.0V, and TA= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SPI TIMING CHARACTERISTICS (see Figure 1)
SCLK Clock Period t
CP
ns
SCLK Pulse-Width High t
CH
40 ns
SCLK Pulse-Width Low t
CL
40 ns
CS Fall to SCLK Fall Setup Time t
CSS
25 ns
SCLK Fall to CS Rise Hold Time t
CSH
50 ns
DIN to SCLK Fall Setup Time t
DS
40 ns
DIN to SCLK Fall Hold Time t
DH
0ns
CS Pulse-Width High t
CSW
ns
Note 1: Devices are 100% production tested at TA= +25°C. Limits over temperature are guaranteed by design.
Note 2: INL linearity is from code 48 to code 1023.
Note 3: Guaranteed by design. Not production tested.
Note 4: 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
(VDD= +3.0V, GND = 0, external reference = +2.5V, TA= +25°C, unless otherwise noted.)
-4
-3
-2
-1
0
1
2
3
4
0 256 512 768 1024
INTEGRAL NONLINEARITY
vs. DIGITAL INPUT CODE (1.2mA SETTING)
MAX5547 toc01
DIGITAL INPUT CODE
INL (LSB)
-4
-3
-2
-1
0
1
2
3
4
0 256 512 768 1024
INTEGRAL NONLINEARITY
vs. DIGITAL INPUT CODE (3.6mA SETTING)
MAX5547 toc02
DIGITAL INPUT CODE
INL (LSB)
-1.00
-0.75
-0.50
-0.25
0
0.25
0.50
0.75
1.00
0 256 512 768 1024
DIFFERENTIAL NONLINEARITY
vs. DIGITAL INPUT CODE (1.2mA SETTING)
MAX5547 toc03
DIGITAL INPUT CODE
DNL (LSB)
100
100
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