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The MAX3286/MAX3296 series of products are highspeed
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 control
(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 verticalcavity
surface-emitting lasers (VCSELs).
The MAX3286 series (MAX3286-MAX3289) is optimized
for operation at 1.25Gbps, and the MAX3296
series (MAX3296-MAX3299) is optimized for 2.5Gbps
operation. Each device can switch 30mA of laser modulation
current at the specified data rate. Adjustable
temperature compensation is provided to keep the optical
extinction ratio within specifications over the operating
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.
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 programmable
power-on reset pulse initializes the laser
driver at startup.
The MAX3286/MAX3296 are available in a compact, 5mm
x 5mm, 28-pin QFN or thin QFN package; a 5mm x 5mm, 32-pin
TQFP package; or in die form. The MAX3287/MAX3288/
MAX3289 and MAX3297/MAX3298/MAX3299 are available
in a 16-pin TSSOP-EP package.
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