MAX3669 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – +3.3V, 622Mbps SDH/SONET Laser Driver with Current Monitors and APC

19-1575; Rev 0; 10/99
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+3.3V, 622Mbps SDH/SONET
Laser Driver with Current Monitors and APC
General Description
The MAX3669 is a complete, +3.3V laser driver with auto-
matic power control (APC) circuitry for SDH/SONET appli-
cations up to 622Mbps. It accepts differential PECL
inputs, provides bias and modulation currents, and oper-
ates over a temperature range from -40°C to +85°C.
An APC feedback loop is incorporated to maintain a
constant average optical power over temperature and
lifetime. The wide modulation current range from 5mA
to 75mA and bias current of 1mA to 80mA are easy to
program, making this product ideal for use in various
SDH/SONET applications. Two pins are provided to
monitor the current levels in the laser: BIASMON with
current proportional to laser bias current, and MOD-
MON with current proportional to laser modulation.
The MAX3669 also provides enable control and a failure-
monitor output to indicate when the APC loop is unable to
maintain the average optical power. The MAX3669 is
available in a 5mm 32-pin TQFP package as well as in
dice.
Applications
622Mbps SDH/SONET Access Nodes
Laser Driver Transmitters
Section Regenerators
+3.3V
Features
o +3.3V or +5.0V Single-Supply Operation
o 40mA Supply Current at +3.3V
o Programmable Bias Current from 1mA to 80mA
o Programmable Modulation Current from
5mA to 75mA
o Bias Current and Modulation Current Monitors
o 200ps Rise/Fall Time
o Automatic Average Power Control with Failure
Monitor
o Complies with ANSI, ITU, and Bellcore
SONET/SDH Specifications
o Enable Control
Ordering Information
PART
MAX3669EHJ
MAX3669E/D
TEMP. RANGE
-40°C to +85°C
(Note A)
PIN-PACKAGE
32 TQFP (5mm x 5mm)
Dice*
Note A: Dice are designed to operate over a -40°C to +140°C
junction temperature (T_j) range, but are tested and guaranteed
at T_A = +25°C.
*Contact factory for availability.
Pin Configuration appears at end of data sheet.
Typical Application Circuit
+3.3V
124Ω
MAX3693
4:1
SERIALIZER
WITH
CLOCK GEN
PECL
84.5Ω
124Ω
DATA+
DATA-
84.5Ω
BIASMON
MODMON
+3.3V
MAX3669
V_CC
OUT-
OUT+
BIAS
MD
0.1µF
LASER
R-
6.3Ω ^R+
20Ω
R_D
5Ω
C_D
1µF
R_FILT
20Ω
C_FILT
5pF
FERRITE
BEAD
C_MD
1000pF
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