MAX3667 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – +3.3V, 622Mbps SDH/SONET Laser Driver with Automatic Power Control

19-1311; Rev 1; 3/98
EVAALVUAAILTAIOBNLEKIT
+3.3V, 622Mbps SDH/SONET Laser Driver
with Automatic Power Control
________________General Description
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
90mA.
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.
________________________Applications
622Mbps SDH/SONET Access Nodes
Laser Driver Transmitters
Section Repeaters
____________________________Features
o Single +3.3V or +5.0V Operation
o Automatic Average Power Control
o Bias Current and Modulation Current Monitor
Outputs
o TTL-Compatible Disable Input
o Temperature-Compensated Reference
o PECL-Compatible Data Inputs
_______________Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX3667ECJ -40°C to +85°C
32 TQFP
MAX3667E/D
-40°C to +85°C
Dice*
*Dice are designed to operate from -40°C to +85°C but are
tested and guaranteed only at T_j = +25°C.
Pin Configuration appears at end of data sheet.
____________________________________________________Typical Operating Circuit
+3.3V
+3.3V
C_COMP 1µF
50Ω
0.1µF
MONITOR
DIODE
LASER
DIODE
0.1µF
COMP BIASMON MODMON APCSET
MAX3691
130Ω 130Ω
4:1
SERIALIZER
WITH
CLOCK GEN
IN+
PECL
IN-
MAX3667
82Ω
82Ω
GND DISABLE MODSET BIASSET
APC
V_{CC MD}
IMOD
IBIAS
C_APC
1nF
R_DAMP
1µF _4.7Ω
R_FILT
22Ω
0.01µF
470nH
100Ω
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