19-1311; Rev 3; 1/03
+3.3V, 622Mbps SDH/SONET Laser Driver
with Automatic Power Control
The MAX3667 is a complete, +3.3V laser driver with
automatic power control (APC), designed for SDH/
SONET applications up to 622Mbps. It accepts differ-
ential PECL inputs, provides single-ended bias and
modulation currents, and operates over a -40°C to
+85°C temperature range.
A temperature-stabilized reference voltage simplifies
laser current programming. It allows external program-
ming of the modulation current between 5mAP-P and
60mAP-P, and of the bias current between 5mA and
The APC function, which incorporates a monitor photo-
diode, an external resistor, and two external capacitors,
maintains constant laser output power. Two current
monitors provide high-speed signals that are directly
proportional to the bias and modulation currents.
Additional features include disable/enable control and
a slow-start feature with a minimum turn-on time of
50ns. The MAX3667 is available in die form and in a
32-pin TQFP package.
622Mbps SDH/SONET Access Nodes
Laser Driver Transmitters
o Single +3.3V or +5.0V Operation
o Automatic Average Power Control
o Bias Current and Modulation Current Monitor
o TTL-Compatible Disable Input
o Temperature-Compensated Reference
o PECL-Compatible Data Inputs
MAX3667ECJ -40°C to +85°C
-40°C to +85°C
*Dice are designed to operate from -40°C to +85°C but are
tested and guaranteed only at Tj = +25°C.
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
COMP BIASMON MODMON APCSET
GND DISABLE MODSET BIASSET
________________________________________________________________ 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.