19-2818; Rev 3; 6/11
KIT
ATION
EVALU
BLE
AVAILA
Multirate Laser Driver with Extinction
Ratio Control
General Description
Features
♦
Single 3.3V Power Supply
♦
47mA Power-Supply Current
♦
85mA Modulation Current
♦
♦
♦
♦
♦
100mA Bias Current
Automatic Power Control (APC)
Modulation Compensation
On-Chip Temperature Compensation
Self-Biased Inputs for AC-Coupling
MAX3737
The MAX3737 is a 3.3V laser driver designed for
multirate transceiver modules with data rates from
155Mbps to 2.7Gbps. Lasers can be DC-coupled to the
MAX3737 for reduced component count and ease of
multirate operation.
Laser extinction ratio control (ERC) combines the features
of automatic power control (APC), modulation compensa-
tion, and built-in thermal compensation. The APC loop
maintains constant average optical power. Modulation
compensation increases the modulation current in pro-
portion to the bias current. These control loops combined
with thermal compensation maintain a constant optical
extinction ratio over temperature and lifetime.
The MAX3737 accepts differential data input signals.
The wide 5mA to 60mA (up to 85mA AC-coupled) mod-
ulation current range and up to 100mA bias current
range makes the MAX3737 ideal for driving FP/DFB
lasers in fiber-optic modules. External resistors set the
required laser current levels. The MAX3737 provides
transmit disable control (TX_DISABLE), single-point
fault tolerance, bias-current monitoring, modulation-cur-
rent monitoring, and photocurrent monitoring. The
device also offers a latched failure output (TX_FAULT)
to indicate faults, such as when the APC loop is no
longer able to maintain the average optical power at the
required level. The MAX3737 is compliant with the SFF-
8472 transmitter diagnostic and SFP MSA timing
requirements.
The MAX3737 is offered in a 5mm x 5mm 32-pin thin QFN
and QFN package and operates over the -40°C to +85°C
extended temperature range.
♦
Ground-Referenced Current Monitors
♦
Laser Safety, Shutdown, and Alarm Outputs
Ordering Information
PART
MAX3737ETJ
MAX3737ETJ+
MAX3737EGJ
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
32 Thin QFN-EP*
32 Thin QFN-EP*
32 QFN-EP*
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
Pin Configurations
31 TH_TEMP
27
APCFILT2
26
APCFILT1
29 MODSET
28 APCSET
TOP VIEW
30 MODBCOMP
32 MODTCOMP
25
VMD
24
23
22
21
GND
TX_DISABLE
V
CC
1
2
3
4
5
6
7
8
10
11
12
13
14
15
9
*EP
16
MD
V
CC
Applications
Multirate OC-3 to OC-48 FEC Transceivers
Gigabit Ethernet SFF/SFP and GBIC
Transceivers
1Gbps/2Gbps Fibre Channel SFF/SFP and GBIC
Transceivers
OUT+
OUT+
OUT-
OUT-
V
CC
IN+
IN-
V
CC
MAX3737EGJ
20
19
18
17
PC_MON
BC_MON
BIAS
MC_MON
TX_FAULT
SHUTDOWN
GND
Functional Diagram and Typical Application Circuit appear
at end of data sheet.
5mm x 5mm
QFN
*THE EXPOSED PADDLE MUST BE SOLDERED TO SUPPLY GROUND
TO ACHIEVE SPECIFIED PERFORMANCE.
Pin Configurations continued at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
GND
GND
VBS
V
CC
Multirate Laser Driver with Extinction
Ratio Control
MAX3737
ABSOLUTE MAXIMUM RATINGS
Supply Voltage V
CC
...............................................-0.5V to +6.0V
IN+, IN-, TX_DISABLE, TX_FAULT, SHUTDOWN,
MC_MON, BC_MON, PC_MON, VBS, VMD,
APCFILT1, APCFILT2, MD, TH_TEMP,
MODTCOMP, MODBCOMP, MODSET, and
APCSET Voltage .......................................-0.5V to V
CC
+ 0.5V
OUT+, OUT-, BIAS Current.............................-20mA to +150mA
Continuous Power Dissipation (T
A
= +85°C)
QFN/TQFN (derate 21.2mW/°C above +85°C) ................1.3W
Operating Junction Temperature Range ...........-55°C to +150°C
Storage Temperature Range .............................-55°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow)
Lead(Pb)-free...............................................................+260°C
Containing lead(Pb) .....................................................+240°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
CC
= 2.97V to 3.63V, T
A
= -40°C to +85°C. Typical values are at V
CC
= 3.3V, I
BIAS
= 60mA, I
MOD
= 60mA, T
A
= +25°C, unless other-
wise noted.) (Notes 1, 2)
PARAMETER
POWER SUPPLY
Supply Current
Power-Supply Noise Rejection
I/O SPECIFICATIONS
Differential Input Swing
Common-Mode Input
LASER BIAS
Bias-Current Setting Range
Bias Off Current
Bias-Current Monitor Ratio
LASER MODULATION
Modulation-Current Setting
Range
Output Edge Speed
Output Overshoot/Undershoot
Random Jitter
I
MOD
(Note 5)
20% to 80%
(Notes 6, 7)
(Note 7)
(Notes 6, 7)
2.7Gbps
1.25Gbps
Deterministic Jitter (Notes 6, 8)
622Mbps
155Mbps
Modulation-Current Temperature
Stability
(Note 6)
5mA
I
MOD
10mA
10mA < I
MOD
85mA
5mA I
MOD
10mA
10mA < I
MOD
5mA
5mA
I
MOD
I
MOD
10mA < I
MOD
10mA < I
MOD
85mA
10mA
85mA
10mA
85mA
5mA
I
MOD
10mA
85mA
5
71
52
±6
0.65
25.6
16
32
15
39
21
65
46
±150
1.3
40
40
41
41
46
46
100
70
±480
ppm/°C
ps
P-P
85
80
80
mA
ps
%
ps
TX_DISABLE = high
I
BIAS
/I
BC_MON
62
76
1
100
0.1
90
mA
mA
mA/mA
V
ID
V
CM
DC-coupled, Figure 1
0.2
1.7
2.4
V
CC
-
V
ID
/4
V
P-P
V
I
CC
PSNR
(Note 3)
f
1MHz, 100mV
P-P
(Notes 4, 6)
47
33
60
mA
dB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
10mA < I
MOD
2
_______________________________________________________________________________________
Multirate Laser Driver with Extinction
Ratio Control
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 2.97V to 3.63V, T
A
= -40°C to +85°C. Typical values are at V
CC
= 3.3V, I
BIAS
= 60mA, I
MOD
= 60mA, T
A
= +25°C, unless other-
wise noted.) (Notes 1, 2)
PARAMETER
Modulation-Current Setting Error
Modulation Off Current
Modulation-Current Monitor Ratio
EXTINCTION RATIO CONTROLS
Monitor-Diode Input Current Range
MD Pin Voltage
MD-Current Monitor Ratio
APC Loop Time Constant
APC Setting Stability
APC Setting Accuracy
I
MOD
Compensation Setting
Range by Bias
I
MOD
Compensation Setting
Range by Temperature
Threshold Setting Range for
Temperature Compensation
LASER SAFETY AND CONTROL
Bias and Modulation Turn-Off
Delay
Bias and Modulation Turn-On
Delay
Threshold Voltage at Monitor Pins
INTERFACE SIGNALS
TX_DISABLE Input High
TX_DISABLE Input Low
TX_DISABLE Input Current
TX_FAULT Output Low
Shutdown Output High
Shutdown Output Low
V
HI
V
LO
R
PULL
= 7.5k
V
HI
= V
CC
V
LO
= GND
Sinking 1mA, open collector
Sourcing 100μA
Sinking 100μA
V
CC
-
0.4
0.4
-450
2.0
0.8
15
-800
0.4
V
V
μA
V
V
V
V
REF
C
APC_FILT
= 0.01μF, I
MD
/ I
BIAS
= 1/80
(Note 6)
C
APC_FILT
= 0.01μF, I
MD
/ I
BIAS
= 1/80
(Note 6)
Figure 5
1.14
1.3
5
600
1.39
μs
μs
V
K
TC
T
TH
T
A
= +25°C
K = I
MOD
/ I
BIAS
TC = I
MOD
/
(Note 6)
(Note 6)
0
0
10
I
MD
/I
PC_MON
C
APC_FILT
= 0.01μF, I
MD
/ I
BIAS
= 1/70
0.85
1.0
3.3
±100
±480
±15
1.5
1.0
60
I
MD
Average current into the MD pin
18
1500
1.4
1.15
μA
V
mA/mA
μs
ppm/°C
%
mA/mA
mA/°C
°C
SYMBOL
15 load,
T
A
= +25°C
TX_DISABLE = high
I
MOD
/I
MC_MON
223
262
CONDITIONS
5mA
I
MOD
10mA
85mA
10mA < I
MOD
MIN
TYP
MAX
±20
±15
0.1
302
UNITS
%
mA
mA/mA
MAX3737
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
AC characterization is performed using the circuit in Figure 2 using a PRBS 2
23
- 1 or equivalent test pattern.
Specifications at -40°C are guaranteed by design and characterization.
Excluding I
BIAS
and I
MOD
. Input data is AC-coupled. TX_FAULT open, SHUTDOWN open.
Power-supply noise rejection (PSNR) = 20log
10
(V
noise (on VCC)
/ΔV
OUT
). V
OUT
is the voltage across the 15Ω load when IN+ is high.
The minimum required voltage at the OUT+ and OUT- pins is +0.75V.
Guaranteed by design and characterization.
Tested with 00001111 pattern at 2.7Gbps.
DJ includes pulse-width distortion (PWD).
_______________________________________________________________________________________
3
Multirate Laser Driver with Extinction
Ratio Control
MAX3737
Typical Operating Characteristics
(V
CC
= 3.3V, C
APC
= 0.01µF, I
BIAS
= 20mA, I
MOD
= 30mA, T
A
= +25°C, unless otherwise noted.)
OPTICAL EYE DIAGRAM
(2.7Gbps, 2
7
- 1PRBS, 2.3GHz FILTER)
MAX3737 toc01
OPTICAL EYE DIAGRAM
(1.25Gbps, 2
7
- 1PRBS, 940MHz FILTER)
1310nm FP LASER
E
r
= 8.2dB
MAX3737 toc02
MAX3737 toc04
1310nm FP LASER
E
r
= 8.2dB
54ps/div
116ps/div
(155Mbps,
2
7
OPTICAL EYE DIAGRAM
- 1PRBS, 117MHz FILTER, C
APC
= 0.1μF)
MAX3737 toc03
ELECTRICAL EYE DIAGRAM
(I
MOD
= 30mA, 2.7Gbps, 2
7
- 1PRBS)
75mV/div
920ps/div
52ps/div
SUPPLY CURRENT (I
CC
) vs. TEMPERATURE
(EXCLUDES BIAS AND MODULATION CURRENTS)
I
MOD
= 60mA
I
BIAS
= 60mA
MAX3737 toc05
BIAS-CURRENT MONITOR GAIN
vs. TEMPERATURE
MAX3737 toc06
PHOTO-CURRENT MONITOR GAIN
vs. TEMPERATURE
1.15
I
MD
/I
PC_MON
(mA/mA)
1.10
1.05
1.00
0.95
0.90
0.85
0.80
MAX3737 toc07
65
60
SUPPLY CURRENT (mA)
55
V
CC
= 3.63V
50
45
40
35
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
V
CC
= 2.97V
V
CC
= 3.3V
90
88
86
I
BIAS
/I
BC_MON
(mA/mA)
84
82
80
78
76
74
72
70
-40
-15
10
35
60
1.20
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
4
_______________________________________________________________________________________
Multirate Laser Driver with Extinction
Ratio Control
Typical Operating Characteristics (continued)
(V
CC
= 3.3V, C
APC
= 0.01µF, I
BIAS
= 20mA, I
MOD
= 30mA, T
A
= +25°C, unless otherwise noted.)
MODULATION-CURRENT MONITOR GAIN
vs. TEMPERATURE
290
280
I
MOD
/I
MC_MON
(mA/mA)
270
I
MOD
(mA)
260
250
240
230
220
210
200
-40
-15
10
35
60
85
TEMPERATURE (
°
C)
MAX3737 toc08
MAX3737
MODULATION CURRENT
vs. R
MODSET
80
70
60
50
40
30
20
10
0
1
10
R
MODSET
(kΩ)
100
I
MD
(mA)
MAX3737 toc09
PHOTODIODE CURRENT
vs. R
APCSET
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0.1
1
R
APCSET
(kΩ)
10
100
MAX3737 toc10
300
90
1.6
DETERMINISTIC JITTER
vs. MODULATION CURRENT
45
40
35
DJ (ps
P-P
)
RJ (ps
RMS
)
30
25
20
15
10
5
0
0
10
20
30
40
50
60
70
80
90
I
MOD
(mA)
0
0
MAX3737 toc11
RANDOM JITTER
vs. MODULATION CURRENT
MAX3737 toc12
50
2.0
1.5
1.0
0.5
20
40
60
80
100
I
MOD
(mA)
COMPENSATION (K)
vs. R
MODBCOMP
MAX3737 toc13
TEMPERATURE COMPENSATION
vs. R
TH_TEMP
(R
MODTCOMP
= 500Ω)
R
TH_TEMP
= 12kΩ
90
80
I
MOD
(mA)
70
60
R
TH_TEMP
= 2kΩ
50
40
R
TH_TEMP
= 7kΩ
R
TH_TEMP
= 4kΩ
MAX3737 toc14
10
100
1
K (mA/mA)
0.1
0.01
0
0.1
1
R
MODBCOMP
(kΩ)
10
100
30
-20
0
20
40
60
80
100
TEMPERATURE (
°
C)
_______________________________________________________________________________________
5
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