MAX3668_05 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – +3.3V, 622Mbps SDH/SONET Laser Driver with Automatic Power Control

19-4799; Rev 4; 2/05
+3.3V, 622Mbps SDH/SONET
Laser Driver with Automatic Power Control
General Description
The MAX3668 is a complete, +3.3V laser driver with
automatic power control (APC) circuitry for SDH/SONET
applications up to 622Mbps. It accepts differential
PECL inputs, provides bias and modulation currents,
and operates over a temperature range of -40°C to
+85°C.
An APC feedback loop is incorporated to maintain a
constant average optical power over temperature and
lifetime. The wide modulation current range of 5mA to
75mA and bias current of 1mA to 80mA are easy to
program, making this product ideal for use in various
SDH/SONET applications.
The MAX3668 also provides enable control and a failure-
monitor output to indicate when the APC loop is unable
to maintain the average optical power. The MAX3668 is
available in a 5mm 32-pin TQFP package as well as in
dice.
Applications
622Mbps SDH/SONET Access Nodes
Laser Driver Transmitters
Section Regenerators
Features
♦ Single +3.3V or +5.0V Operation
♦ 38mA Supply Current at +3.3V
♦ Programmable Modulation Current from
5mA to 75mA
♦ Programmable Bias Current from 1mA to 80mA
♦ Rise/Fall Time <200ps
♦ Automatic Average Power Control with Failure
Monitor
♦ Complies with ANSI, ITU, and Bellcore
SONET/SDH Specifications
♦ Enable Control
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX3668EHJ
-40°C to +85°C 32 TQFP (5mm x 5mm)
MAX3668EHJ+ -40°C to +85°C 32 TQFP (5mm x 5mm)
MAX3668E/D
Note
Dice*
Note: Dice are designed to operate over a -40°C to +140°C
junction temperature (Tj) range, but are tested and guaranteed
at T_A = +25°C.
*Contact factory for availability.
+Denotes lead-free package.
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
+3.3V
130Ω
MAX3693
4:1
SERIALIZER
WITH
CLOCK GEN
PECL
82Ω
130Ω
DATA+
DATA-
82Ω
MAX3668
+3.3V
V_CC
OUT-
OUT+
BIAS
MD
0.1µF
LASER
R-
6.3Ω ^R+
20Ω
R_D
5Ω
C_D
1.0µF
R_FILT
20Ω
C_FILT
5pF
FERRITE
BEAD
C_MD
1000pF
†_C0
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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.