19-1570; Rev 4; 1/05
EVAALVUAAILTAIOBNLEKIT
+3.3V, 2.5Gbps SDH/SONET Laser Driver
with Current Monitors and APC
General Description
The MAX3869 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. A synchronizing input latch can be used (if a
clock signal is available) to reduce jitter.
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 MAX3869 also provides enable control, two current
monitors that are directly proportional to the laser bias and
modulation currents, and a failure-monitor output to indi-
cate when the APC loop is unable to maintain the average
optical power. The MAX3869 is available in 32-pin TQFP
and small 32-pin QFN packages as well as dice.
Applications
SONET/SDH Transmission Systems
Add/Drop Multiplexers
Digital Cross-Connects
Section Regenerators
2.5Gbps Optical Transmitters
Pin Configuration appears at end of data sheet.
+3.3V
124Ω 124Ω 124Ω 124Ω
MAX3890
SERIALIZER
WITH
CLOCK GEN.
84.5Ω 84.5Ω 84.5Ω 84.5Ω
DATA+
DATA-
CLK+
CLK-
Features
♦ Single +3.3V or +5V Power Supply
♦ 64mA Supply Current at +3.3V
♦ Programmable Bias Current from 1mA to 100mA
♦ Programmable Modulation Current from
5mA to 60mA
♦ Bias Current and Modulation Current Monitors
♦ 87ps Rise/Fall Time
♦ Automatic Average Power Control with Failure
Monitor
♦ Complies with ANSI, ITU, and Bellcore
SDH/SONET Specifications
♦ Enable Control
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX3869EHJ
-40°C to +85°C 32 TQFP-EP*
MAX3869EHJ+
-40°C to +85°C 32 TQFP-EP*
MAX3869EGJ
-40°C to +85°C 32 QFN**
MAX3869E/D
-40°C to +85°C Dice***
*Exposed pad.
**Package Code: G3255-1
***Dice are designed to operate over this range, but are tested and
guaranteed at TA = +25°C only. Contact factory for availability.
+Denotes lead-free package.
Typical Application Circuit
+3.3V
25Ω
MAX3869
OUT-
OUT+
BIAS
MD
FERRITE
BEAD
0.01µF
LD
23Ω
0.056µF
BIASMON
MODMON
1000pF
+3.3V
________________________________________________________________ Maxim Integrated Products 1
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.