19-2281; Rev 4; 11/08
2.7Gbps Laser Driver with Modulation
Compensation
MAX863
General Description
Features
♦ Single +3.3V Power Supply
♦ 58mA Power-Supply Current
♦ Up to 2.7Gbps (NRZ) Operation
♦ On-Chip Termination Resistors
♦ Automatic Power Control (APC)
The MAX3863 is designed for direct modulation of laser
diodes at data rates up to 2.7Gbps. An automatic
power-control (APC) loop is incorporated to maintain a
constant average optical power. Modulation compensa-
tion is available to increase the modulation current in
proportion to the bias current. The optical extinction
ratio is then maintained over temperature and lifetime.
♦ Compensation for Constant Extinction Ratio
♦ Programmable Modulation Current Up to 80mA
♦ Programmable Bias Current Up to 100mA
♦ 50ps Typical Rise/Fall Time
♦ Pulse-Width Adjustment Circuit
♦ Selectable Data-Retiming Latch
♦ Failure Detector
The laser driver can modulate laser diodes at ampli-
tudes up to 80mA. Typical (20% to 80%) edge speeds
are 50ps. The MAX3863 can supply a bias current up
to 100mA. External resistors can set the laser output
levels.
The MAX3863 includes adjustable pulse-width control
to minimize laser pulse-width distortion. The device
offers a failure monitor output to indicate when the APC
loop is unable to maintain the average optical power.
♦ Mark-Density Monitor
♦ Current Monitors
♦ ESD Protection
The MAX3863 accepts differential CML clock and data
input signals with on-chip 50Ω termination resistors. If a
clock signal is available, an input data-retiming latch
can be used to reject input pattern-dependent jitter.
The laser driver is fabricated with Maxim’s in-house
second-generation SiGe process.
Ordering Information
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
32 TQFN-EP*
32 QFN-EP*
MAX3863ETJ+
MAX3863EGJ
+Denotes a lead-free/RoHS-compliant package.
*EP = Exposed pad.
Pin Configuration
Applications
SONET and SDH Transmission Systems
WDM Transmission Systems
3.2Gbps Data Communications
Add/Drop Multiplexers
TOP VIEW
V
1
2
3
4
5
6
7
8
24 MDMON
23 MD
CC
Digital Cross-Connects
DATA+
DATA-
Section Regenerators
22
V
CC
Long-Reach Optical Transmitters
V
V
21 MODN
20 MOD
CC
CC
MAX3863
CLK+
CLK-
19
V
CC
18 BIAS
V
FAIL
17
CC
*EP
TQFN-EP
QFN-EP
*THE EXPOSED PAD MUST BE SOLDERED TO GND ON THE CIRCUIT BOARD.
________________________________________________________________ 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.