MAXIM MAX3869 +3.3V, 2.5Gbps SDH SONET Laser Driver with Current Monitors and APC User Manual
Summary
The MAX3869 is a specialized, single +3.3V laser driver designed for critical high-speed optical links in SDH/SONET transmission systems up to 2.5Gbps. This manual provides comprehensive details on the chip's operation, featuring highly programmable bias and modulation currents, automatic power control (APC), and precise current monitoring for reliable performance. It is essential documentation for engineers developing advanced and resilient telecommunication network equipment.
Page 1 Text Content
19-1570; Rev 4; 1/05
EVALUATION KIT AVAILABLE
+3.3V, 2.5Gbps SDH/SONET Laser Driver
with Current Monitors and APC General Description Features
The MAX3869 is a complete, single +3.3V laser driver Single +3.3V or +5V Power Supply for SDH/SONET applications up to 2.5Gbps. The
64m A Supply Current at +3.3V
device accepts differential PECL data and clock inputs and provides bias and modulation currents for driving a
Programmable Bias Current from 1m A to 100m A
laser. A synchronizing input latch can be used (if a
Programmable Modulation Current from
clock signal is available) to reduce jitter.
5m A to 60m A
An automatic power control (APC) feedback loop is incorporated to maintain a constant average optical Bias Current and Modulation Current Monitors power over temperature and lifetime. The wide modula-
87ps Rise/Fall Time
tion current range of 5m A to 60m A and bias current of 1m A to 100m A are easy to program, making this prod- Automatic Average Power Control with Failure uct ideal for use in various SDH/SONET applications.
Monitor
The MAX3869 also provides enable control, two current BI AS AX
Complies with ANSI, ITU, and Bellcore
monitors that are directly proportional to the laser bias and LA TC
OD SE SDH/SONET Specifications
modulation currents, and a failure-monitor output to indi-
AP CS ET
cate when the APC loop is unable to maintain the average Enable Control
EN AB LE
optical power. The MAX3869 is available in 32-pin TQFP Ordering Information
and small 32-pin QFN packages as well as dice. AP CF IL
PART TEMP RANGE PIN-PACKAGE
FA IL
CA PC MAX3869EHJ -40°C to +85°C 32 TQFP-EP*
Applications
MAX3869EHJ+ -40°C to +85°C 32 TQFP-EP*
SONET/SDH Transmission Systems
MAX3869EGJ -40°C to +85°C 32 QFN**
Add/Drop Multiplexers
MAX3869E/D -40°C to +85°C Dice***
Digital Cross-Connects
*Exposed pad. Section Regenerators **Package Code: G3255-1 ***Dice are designed to operate over this range, but are tested and
2.5Gbps Optical Transmitters
guaranteed at TA = +25°C only. Contact factory for availability. +Denotes lead-free package.
Pin Configuration appears at end of data sheet.
Typical Application Circuit
124Ω 124Ω 124Ω 124Ω FERRITE BEAD
DATA+
DATA-
MAX3890
SERIALIZER CLK+ MAX3869
WITH BIAS CLOCK GEN. CLK-
84.5Ω 84.5Ω 84.5Ω84.5Ω BIASMON 1000p F
MODMON
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 MAX3869 +3.3V, 2.5Gbps SDH SONET Laser Driver with Current Monitors and APC User Manual
Manual Details
| Brand | Current |
|---|---|
| Pages | 15 |
| File Size | 673.63 KB |
| Published | May 30, 2026 |
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Frequently Asked Questions
What are the available packages for the MAX3869 driver?
It is offered in three package types: 32-pin TQFP, 32-pin QFN, and dice.
What range of bias current can be set on this device?
The programmable bias current ranges from a minimum of 1mA to a maximum of 100mA.
Does the MAX3869 monitor optical power stability?
Yes, it features an Automatic Average Power Control (APC) feedback loop and monitors for bias and modulation currents.
What kind of data inputs does this laser driver support?
The device supports differential PECL data and clock inputs into the MAX3869.