MAX3867 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – +3.3V, 2.5Gbps SDH/SONET Laser Driver with Automatic Power Control

19-4769; Rev 0a; 9/98
EVAALVUAAILTAIOBNLEKIT
+3.3V, 2.5Gbps SDH/SONET Laser Driver
with Automatic Power Control
General Description
The MAX3867 is a complete, single +3.3V laser driver
for SDH/SONET applications up to 2.5Gbps. The
device accepts differential PECL data and clock inputs
and provides bias and modulation currents for driving a
laser. The synchronizing input latch can be bypassed if
a clock signal is not available.
An automatic power control (APC) feedback loop is
incorporated to maintain a constant average optical
power over temperature and lifetime. The wide modula-
tion current range of 5mA to 60mA and bias current of
1mA to 100mA are easy to program, making this prod-
uct ideal for use in various SDH/SONET applications.
The MAX3867 also provides enable control, a program-
mable slow-start circuit to set the laser turn-on delay,
and a failure-monitor output to indicate when the APC
loop is unable to maintain the average optical power.
The MAX3867 is available in a small 48-pin TQFP pack-
age as well as dice.
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 62mA Supply Current at +3.3V
o Programmable Modulation Current from
5mA to 60mA
o Programmable Bias Current from 1mA to 100mA
o Rise/Fall Time < 90ps
o Automatic Average Power Control with Failure
Monitor
o Complies with ANSI, ITU, and Bellcore
SDH/SONET Specifications
o Enable Control
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX3867ECM
-40°C to +85°C 48 TQFP
MAX3867E/D
-40°C to +85°C Dice*
*Dice are designed to operate over this range, but are tested and
guaranteed at T_A = +25°C only. Contact factory for availability.
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
+3.3V
+3.3V
124Ω 124Ω 124Ω 124Ω
MAX3890
SERIALIZER
WITH
CLOCK GEN.
84.5Ω 84.5Ω 84.5Ω 84.5Ω
DATA+
DATA-
CLK+
MAX3867
CLK-
25Ω
OUT-
OUT+
BIAS
MD
LD
*FERRITE
BEAD
20Ω
0.056µF
1000pF
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