Rainbow Electronics MAX3737 - Manual

General Description
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.
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
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
♦ Ground-Referenced Current Monitors
♦ Laser Safety, Shutdown, and Alarm Outputs
MAX3737
Multirate Laser Driver with Extinction
Ratio Control
________________________________________________________________ Maxim Integrated Products 1
32 31 30 29 28 27 26
MODTCOMP TH_TEMP MODBCOMP MODSET APCSET APCFILT2 APCFILT1
25
VMD
9 10 11 12 13 14 15
MC_MON
GND V
CC
TX_FAULT
SHUTDOWN
VBS GND
16
GND
17
18
19
20
21
22
23
BIAS
*THE EXPOSED PADDLE MUST BE SOLDERED TO SUPPLY GROUND
TO ACHIEVE SPECIFIED PERFORMANCE.
V CC
OUT-
OUT-
OUT+
OUT+
V CC
8
7
6
5
4
3
2
BC_MON
PC_MON
V CC
IN-
IN+
V CC
TX_DISABLE
MAX3737EGJ
1 GND 24 MD
TOP VIEW
5mm x 5mm
QFN
Pin Configurations
Ordering Information
19-2818; Rev 0; 4/03
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.
EVALUATION KIT
AVAILABLE
PART TEMP RANGE PIN-PACKAGE
MAX3737ETJ -40°C to +85°C 32 Thin QFN
MAX3737EGJ -40°C to +85°C 32 QFN
Functional Diagram and Typical Application Circuit appear
at end of data sheet.
Pin Configurations continued at end of data sheet.