MAX3996 Datasheet, PDF (1/17 Pages) Maxim Integrated Products – 3.0V to 5.5V, 2.5Gbps VCSEL and Laser Driver

19-2194; Rev 1; 2/02
3.0V to 5.5V, 2.5Gbps VCSEL
and Laser Driver
General Description
The MAX3996 is a high-speed laser driver for small-
form-factor (SFF) fiber optic LAN transmitters. It con-
tains a bias generator, a laser modulator, and
comprehensive safety features. Automatic power con-
trol (APC) adjusts the laser bias current to maintain
average optical power, regardless of changes in tem-
perature or laser properties. The driver accommodates
common anode or differential laser configurations. The
output current range of the MAX3996 is appropriate for
VCSELs and high-efficiency edge-emitting lasers.
The MAX3996 operates up to 3.2Gbps. It can switch up
to 30mA of laser modulation current and sink up to
60mA bias current. Adjustable temperature compensa-
tion is provided to keep the optical extinction ratio with-
in specifications over the operating temperature range.
The MAX3996 accommodates various laser packages,
including low-cost TO-46 headers. Low deterministic jit-
ter (9ps_P-P), combined with fast edge transitions,
(65ps) provides excellent margins compared to indus-
try-standard transmitter eye masks.
This laser driver provides extensive safety features to
guarantee single-point fault tolerance. Safety features
include a transmit disable, redundant shutdown, and
laser-bias monitoring. The safety circuit detects faults
that could cause hazardous light levels and immediate-
ly disables the laser output. The MAX3996 safety cir-
cuits are compliant with SFF and small-form-factor
pluggable (SFP) multisource agreements (MSA).
The MAX3996 is available in a compact 4mm ✕ 4mm,
20-pin QFN package and operates over a temperature
range of 0°C to +70°C.
Applications
Fibre Channel Optical Transmitters
VCSEL Transmitters
Gigabit Ethernet Optical Transmitters
ATM LAN Optical Transmitters
10 Gigabit Ethernet WWDM
Pin Configuration appears at end of data sheet.
Features
o 9ps_P-P Deterministic Jitter
o 20-Pin QFN 4mm ✕ 4mm Package
o 3.0V to 5.5V Supply Voltage
o Automatic Power Control
o Integrated Safety Circuits
o 30mA Laser Modulation Current
o Temperature Compensation of Modulation
Current
o Compliant with SFF and SFP MSA
PART
MAX3996CGP
Ordering Information
TEMP RANGE
0°C to +70°C
PIN-PACKAGE
20 QFN
Typical Application Circuit
V_CC
OPTIONAL SHUTDOWN
CIRCUITRY
V_CC
1.8kΩ
TX_DISABLE
FAULT
0.01µF
IN+
0.01µF
IN-
V_CC
SHDNDRV
0.01µF
MAX3996
0.01µF
OUT-
0.01µF
OUT+
L1*
25Ω
BIAS
PORDLY
MD
TC MODSET MON1 MON2 COMP GND
C_PORDLY
R_TC R_MOD
N.C.
C_COMP
R_SET
*FERRITE BEAD
________________________________________________________________ Maxim Integrated Products 1
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