MAXIM INTEGRATED PRODUCTS MAX3668† Quick User Guide +3.3V, 622Mbps SDH SONET Laser Driver with Automatic Power Control
Summary
The MAX3668 is a specialized +3.3V laser driver designed for high-speed SDH/SONET networking applications up to 622Mbps. Featuring crucial automatic power control (APC) circuitry, this device ensures stable optical power over wide temperature ranges while allowing programmable bias and modulation currents. This technical guide details the product's full operational specifications, including electrical characteristics, failure monitoring features, and integration guidelines. It is essential documentation for engineers selecting components for reliable access nodes and regenerators in telecommunication systems.
Page 1 Text Content
19-4799; Rev 4; 2/05
+3.3V, 622Mbps SDH/SONET
Laser Driver with Automatic Power Control General Description Features The MAX3668 is a complete, +3.3V laser driver with Single +3.3V or +5.0V Operation
automatic power control (APC) circuitry for SDH/SONET
38m A Supply Current at +3.3V
applications up to 622Mbps. It accepts differential PECL inputs, provides bias and modulation currents,
Programmable Modulation Current from
and operates over a temperature range of -40°C to
5m A to 75m A
Programmable Bias Current from 1m A to 80m A
An APC feedback loop is incorporated to maintain a constant average optical power over temperature and Rise/Fall Time <200ps lifetime. The wide modulation current range of 5m A to
Automatic Average Power Control with Failure
75m A and bias current of 1m A to 80m A are easy to
BI AS AX
Monitor
program, making this product ideal for use in various EN AB LE SDH/SONET applications. Complies with ANSI, ITU, and Bellcore
OD SE
The MAX3668 also provides enable control and a failure- SONET/SDH Specifications
monitor output to indicate when the APC loop is unable AP CS ET
Enable Control
to maintain the average optical power. The MAX3668 is
Ordering Information
available in a 5mm 32-pin TQFP package as well as in CA PC dice.
PART TEMP RANGE PIN-PACKAGE
FA IL
GN MAX3668EHJ -40°C to +85°C 32 TQFP (5mm x 5mm)
Applications
MAX3668EHJ+ -40°C to +85°C 32 TQFP (5mm x 5mm)
622Mbps SDH/SONET Access Nodes
MAX3668E/D Note Dice*
Laser Driver Transmitters Note: Dice are designed to operate over a -40°C to +140°C
junction temperature (Tj) range, but are tested and guaranteed
Section Regenerators
at TA = +25°C. *Contact factory for availability. +Denotes lead-free package. Pin Configuration appears at end of data sheet.
Typical Operating Circuit
LASER
DATA+ RD
MAX3693 5Ω
DATA- OUT+
4:1 CD
MAX3668 RFILT
SERIALIZER 1.0µF
CFILT
CLOCK GEN
FERRITE BEAD
CMD 1000p F
†Covered by U.S. Patent numbers 5,802,089 and 5,883,910
Maxim Integrated Products
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.
Page Summary Contents For MAXIM INTEGRATED PRODUCTS MAX3668† Quick User Guide +3.3V, 622Mbps SDH SONET Laser Driver with Automatic Power Control
Manual Details
| Brand | Maxim Integrated |
|---|---|
| Pages | 12 |
| File Size | 744.72 KB |
| Published | May 26, 2026 |
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Frequently Asked Questions
What does the Automatic Power Control (APC) circuit maintain?
The APC feedback loop maintains a constant average optical power over temperature.
What signal inputs and outputs does the MAX3668 handle?
It accepts differential PECL inputs and provides configurable bias and modulation currents.
What is the operational frequency range of this laser driver?
The device supports applications up to 622Mbps for SDH/SONET.
What are the required temperature specifications for operation?
The MAX3668 operates over a temperature range of -40°C to +85°C.