19-2081; Rev 3; 2/07
+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 available.
The driver can provide bias current up to 100mA and
modulation current up to 60mAP-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 4mm ✕ 4mm, 24-pin QFN and thin QFN pack-
ages, 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
Pin Configurations appear at end of data sheet.
Features
♦ 30mA Power-Supply Current
♦ Single +3.3V Power Supply
♦ Up to 2.7Gbps (NRZ) Operation
♦ Automatic Average Power Control with Failure
Monitor
♦ Programmable Modulation Current from 5mA to
60mA
♦ Programmable Bias Current from 1mA to 100mA
♦ Typical Fall Time of 59ps
♦ Selectable Data Retiming Latch
♦ Complies with ANSI, ITU, and Bellcore
SDH/SONET Specifications
Ordering Information
PART
TEMP RANGE PIN-
PACKAGE
PACKAGE
CODE
MAX3273EGG -40°C to +85°C 24 QFN
G2444-1
(4mm 4mm)
MAX3273ETG+ -40°C to +85°C 24 Thin QFN T2444-2
(4mm 4mm)
MAX3273E/D -40°C to +85°C Dice*
—
*Dice are designed to operate from TA = -40°C to +85°C, but
are tested and guaranteed at TA = +25°C only.
+Denotes lead-free package.
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.
†.
________________________________________________________________ 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.