19-1550; Rev 3; 7/02
to
3.0V 5.5V, 1.25Gbps/2.5Gbps
LAN Laser Drivers
General Description
Features
The MAX3286/MAX3296 series of products are high-
speed laser drivers for fiber optic LAN transmitters,
optimized for Gigabit Ethernet applications. Each
device contains a bias generator, laser modulator, and
comprehensive safety features. Automatic power con-
trol (APC) adjusts the laser bias current to maintain
average optical power at a constant level, regardless of
changes in temperature or laser properties. For lasers
without a monitor photodiode, these products offer a
constant-current mode. The circuit can be configured
for use with conventional shortwave (780nm to 850nm)
or longwave (1300nm) laser diodes, as well as vertical-
cavity surface-emitting lasers (VCSELs).
ꢀ 7ps Deterministic Jitter (MAX3296)
22ps Deterministic Jitter (MAX3286)
ꢀ +3.0V to +5.5V Supply Voltage
ꢀ Selectable Laser Pinning (Common Cathode or
Common Anode) (MAX3286/MAX3296)
ꢀ 30mA Laser Modulation Current
ꢀ Temperature Compensation of Modulation
Current
ꢀ Automatic Laser Power Control or Constant Bias
Current
The MAX3286 series (MAX3286–MAX3289) is opti-
mized for operation at 1.25Gbps, and the MAX3296
series (MAX3296–MAX3299) is optimized for 2.5Gbps
operation. Each device can switch 30mA of laser mod-
ulation current at the specified data rate. Adjustable
temperature compensation is provided to keep the opti-
cal extinction ratio within specifications over the operat-
ing temperature range. This series of devices is
optimized to drive lasers packaged in low-cost TO-46
headers. Deterministic jitter (DJ) for the MAX3286 is
typically 22ps, allowing a 72% margin to Gigabit
Ethernet DJ specifications.
ꢀ Integrated Safety Circuits
ꢀ Power-On Reset Signal
ꢀ QFN Package Available
Ordering Information
PART
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
28 QFN (5mm x 5mm)**
32 TQFP (5mm x 5mm)
Dice*
MAX3286CGI
MAX3286CHJ
MAX3286C/D
Ordering Information continued at end of data sheet.
*Dice are designed to operate from T = 0°C to +110°C, but are
J
These laser drivers provide extensive safety features to
guarantee single-point fault tolerance. Safety features
include dual enable inputs, dual shutdown circuits, and
a laser-power monitor. The safety circuit detects faults
that could cause dangerous light output levels. A pro-
grammable power-on reset pulse initializes the laser
driver at startup.
tested and guaranteed only at T = +25°C.
A
**Exposed pad.
Pin Configurations
TOP VIEW
GND
The MAX3286/MAX3296 are available in a compact, 5mm
GND
✕
✕
5mm, 28-pin QFN package; a 5mm 5mm, 32-pin
TQFP package; or in die form. The MAX3287/MAX3288/
MAX3289 and MAX3297/MAX3298/MAX3299 are avail-
able in a 16-pin TSSOP-EP package.
FAULT
FAULT
POR
1
2
3
4
5
6
7
21 BIASDRV
20 SHDNDRV
19 GND
Applications
MAX3286
MAX3296
GND
18 MON
17 MD
Gigabit Ethernet Optical Transmitter
Fibre Channel Optical Transmitter
ATM LAN Optical Transmitter
EN
EN
16 POL
PORDLY
15 POL
GND
GND
Typical Application Circuits and Selector Guide appear at
end of data sheet.
QFN*
*Exposed pad is connected to GND.
Pin Configurations continued at end of data sheet.
________________________________________________________________ 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.