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MAX3865 Datasheet(PDF) 1 Page - Maxim Integrated Products

Part No. MAX3865
Description  2.5Gbps Laser Driver with Automatic Modulation Control
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
Logo MAXIM - Maxim Integrated Products

MAX3865 Datasheet(HTML) 1 Page - Maxim Integrated Products

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General Description
The MAX3865 is designed for direct modulation of laser
diodes at data rates up to 2.5Gbps. It incorporates two
feedback loops, the automatic power-control (APC)
loop and the automatic modulation-control (AMC) loop,
to maintain constant average optical output and extinc-
tion ratio over temperature and laser lifetime. External
resistors or current output DACs may set the laser out-
put levels. The driver can deliver up to100mA of laser
bias current and up to 60mA laser modulation current
with a typical (20% to 80%) edge speed of 84ps.
The MAX3865 accepts differential clock and data input
signals with on-chip 50
Ω termination resistors. The inputs
can be configured for CML or other high-speed logic. An
input data-retiming latch can be enabled to reject input
pattern-dependent jitter when a clock signal is available.
The MAX3865 provides laser bias current and modulation
current monitors, as well as a failure detector, to indicate
the laser operating status. These features are all imple-
mented on an 81mil 103mil die; the MAX3865 is also
available as a 32-pin QFN package.
Applications
SONET/SDH Transmission Systems
Add/Drop Multiplexers
Digital Cross-Connects
Section Regenerators
2.5Gbps Optical Transmitters
Features
o Single +3.3V or +5V Power Supply
o 68mA Supply Current
o Up to 2.5Gbps (NRZ) Operation
o Feedback Control for Constant Average Power
o Feedback Control for Constant Extinction Ratio
o Programmable Bias Current Up to 100mA
o Programmable Modulation Current Up to 60mA
o 84ps Rise/Fall Time
o Selectable Data Retiming Latch
o Bias and Modulation Current Monitors
o Failure Detector
o ESD Protection
2.5Gbps Laser Driver with Automatic
Modulation Control
________________________________________________________________ Maxim Integrated Products
1
Ordering Information
19-2247; Rev 1; 4/02
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.
Pin Configuration appears at end of data sheet.
PART
TEMP. RANGE
PIN-PACKAGE
MAX3865EGJ
-40°C to +85°C
32 QFN
MAX3865E/D
-40°C to +85°C
Dice*
Covered by U.S. Patent numbers 5,883,910, 5,850,409, and other patent pending.
*Dice are designed to operate from -40°C to +85°C , but are tested
and guaranteed at TA = +25°C only. Contact factory for availability.
MAX3865
MAX3892
50
DATA-
DATA-
50
DATA+
DATA+
VDR
VCR
50
CLK+
CLK+
50
CLK-
CLK-
2.5Gbps SERIALIZER
+3.3V
+3.3V
200
200
+3.3V
LED
RMODMAX
RBIASMAX
RAPCSET
RAMCSET
20
+3.3V
20
20
0.056
µF
0.056
µF
15
LASER
MODN
MODQ
BIAS
BIAS_X
MD
MD_X
REPRESENTS A CONTROLLED-IMPEDANCE
TRANSMISSION LINE
LP
LP
Typical Applications Circuit


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