MAX3273 Datasheet, PDF (1/15 Pages) Maxim Integrated Products – +3.3V, 2.5Gbps Low-Power Laser Driver

19-2081; Rev 1; 12/02
+3.3V, 2.5Gbps Low-Power Laser Driver
General Description
The MAX3273 is a compact, low-power laser driver for
applications up to 2.7Gbps. The device uses a single
+3.3V supply and typically consumes 30mA. The bias
and modulation current levels are programmed by
external resistors. An automatic power-control (APC)
loop is incorporated to maintain a constant average
optical power over temperature and lifetime. The laser
driver is fabricated using Maxim’s in-house, second-
generation SiGe process.
The MAX3273 accepts differential CML-compatible
clock and data input signals. Inputs are self-biased to
allow AC-coupling. An input data-retiming latch can be
enabled to reject input jitter if a clock signal is avail-
able.
The driver can provide bias current up to 100mA and
modulation current up to 60mA_P-P with typical (20% to
80%) edge speeds of 59ps. A failure-monitor output is
provided to indicate when the APC loop is unable to
maintain average optical power. The MAX3273 is avail-
able in a 4mm ✕ 4mm, 24-pin QFN package, as well as
in die form.
Applications
SONET OC-48 and SDH STM-16
Transmission Systems
Add/Drop Multiplexers
Digital Cross-Connects
2.5Gbps Optical Transmitters
Features
o 30mA Power-Supply Current
o Single +3.3V Power Supply
o Up to 2.7Gbps (NRZ) Operation
o Automatic Average Power Control with Failure
Monitor
o Programmable Modulation Current from 5mA to
60mA
o Programmable Bias Current from 1mA to 100mA
o Typical Fall Time of 59ps
o Selectable Data Retiming Latch
o Complies with ANSI, ITU, and Bellcore
SDH/SONET Specifications
Ordering Information
PART
MAX3273EGG
MAX3273E/D
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
24 QFN-EP* (4mm × 4mm)
Dice**
*EP=Exposed pad.
**Dice are designed to operate from T_A = -40°C to +85°C,
but are tested and guaranteed at T_A = +25°C only.
Pin Configuration appears at end of data sheet.
Typical Application Circuit
DATA +
DATA -
2.5Gbps
SERIALIZER
WITH CLOCK
GENERATION
CLK+
CLK-
50Ω
100Ω
50Ω
50Ω
100Ω
50Ω
VCC
DATA +
DATA -
CLK+
0.01µF
VCC
LP1
25Ω
OUT-
MAX3273
OUT+
25Ω
BIAS
LP1
LP2
20Ω
0.056µF
CLK-
MD
500pF
REPRESENTS A CONTROLLED-IMPEDANCE TRANSMISSION LINE.
†_{Covered by U.S. patent number 5,883,910.}
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