MAX3735 Datasheet, PDF (1/18 Pages) Maxim Integrated Products – 2.7Gbps, Low-Power SFP Laser Drivers

19-2529; Rev 1; 4/03
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2.7Gbps, Low-Power SFP Laser Drivers
General Description
The MAX3735/MAX3735A are +3.3V laser drivers for
SFP/SFF applications from 155Mbps up to 2.7Gbps.
The devices accept differential input data and provide
bias and modulation currents for driving a laser. DC-
coupling to the laser allows for multirate applications
and reduces the number of external components. The
MAX3735/MAX3735A are fully compliant with the SFP
MSA timing and the SFF-8472 transmit diagnostic
requirements.
An automatic power-control (APC) feedback loop is incor-
porated to maintain a constant average optical power
over temperature and lifetime. The wide modulation cur-
rent range of 10mA to 60mA (up to 85mA AC-coupled)
and bias current of 1mA to 100mA make this product
ideal for driving FP/DFB laser diodes in fiber-optic mod-
ules. The resistor range for the laser current settings is
optimized to interface with the DS1858 SFP controller IC.
The MAX3735/MAX3735A provide transmit-disable con-
trol, a single-point latched transmit-failure monitor out-
put, photocurrent monitoring, and bias-current
monitoring to indicate when the APC loop is unable to
maintain the average optical power. The MAX3735A
also features improved multirate operation.
The MAX3735/MAX3735A come in package and die
form, and operate over the extended temperature
range of -40°C to +85°C.
Applications
Gigabit Ethernet SFP/SFF Transceiver Modules
1G/2G Fibre Channel SFP/SFF Transceiver
Modules
Multirate OC3 to OC48-FEC SFP/SFF Transceiver
Modules
o SFP Reference Design Available
Features
o Fully Compliant with SFP and SFF-8472 MSAs
o Programmable Modulation Current from 10mA to
60mA (DC-Coupled)
o Programmable Modulation Current from 10mA to
85mA (AC-Coupled)
o Programmable Bias Current from 1mA to 100mA
o Edge Transition Times <51ps
o 27mA (typ) Power-Supply Current
o Multirate 155Mbps to 2.7Gbps Operation
o Automatic Average Power Control
o On-Chip Pullup Resistor for TX_DISABLE
o 24-Pin 4mm × 4mm QFN package
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX3735E/D
-40°C to +85°C
Dice*
MAX3735ETG
-40°C to +85°C
24 Thin QFN-EP**
MAX3735EGG
-40°C to +85°C
24 QFN-EP**
MAX3735AETG -40°C to +85°C
24 Thin QFN-EP**
*Dice are designed to operate from -40°C to +85°C, but are
tested and guaranteed only at T_A = +25°C.
**EP = Exposed pad.
Pin Configuration appears at end of data sheet.
Typical Application Circuit
+3.3V
+3.3V
OPTIONAL SHUTDOWN
CIRCUITRY
SERDES
0.1µF
IN+
0.1µF
IN-
DS1858/DS1859
CONTROLLER
H0
IC
H1
MON1
M0N2
M0N3
+3.3V
MAX3735
MAX3735A
OUT-
OUT+
OUT+
BIAS
MD
+3.3V
15Ω
10Ω
FERRITE BEAD
CMD
CAPC
RBC_MON
RPC_MON
REPRESENTS A CONTROLLED-IMPEDANCE TRANSMISSION LINE
0.01µF
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
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