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PDF MAX3996 Data sheet ( Hoja de datos )
| Número de pieza | MAX3996 | |
| Descripción | 3.0V to 5.5V / 2.5Gbps VCSEL and Laser Driver | |
| Fabricantes | Maxim Integrated | |
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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 (9psP-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 9psP-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
VCC
OPTIONAL SHUTDOWN
CIRCUITRY
VCC 1.8kΩ
TX_DISABLE
FAULT
0.01µF
IN+
0.01µF
IN-
VCC SHDNDRV
0.01µF
MAX3996
0.01µF
OUT-
0.01µF
OUT+
25Ω
L1*
PORDLY
BIAS
MD
TC MODSET MON1 MON2 COMP GND
CPORDLY
RTC RMOD
N.C.
CCOMP
RSET
*FERRITE BEAD
________________________________________________________________ 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.
1 page  
3.0V to 5.5V, 2.5Gbps VCSEL
and Laser Driver
Typical Operating Characteristics (continued)
(VCC = 3.3V, TA = +25°C, unless otherwise noted.)
HOT PLUG WITH
TX_DISABLE LOW
0V
VCC
LOW
FAULT
LOW
TX_DISABLE
3.3V
t_init = 23mS
STARTUP WITH SLOW
RAMPING SUPPLY
0V
VCC
LOW
FAULT
LOW
TX_DISABLE
3.3V
TRANSMITTER ENABLE
VCC
3.3V
FAULT LOW
HIGH
TX_DISABLE
t_on = 37µs
LOW
LASER
OUPUT
LASER
OUPUT
LASER
OUPUT
10.0ms/div
10.0ms/div
20.0µs/div
TRANSMITTER DISABLE
VCC 3.3V
FAULT LOW
TX_DISABLE
LASER
OUPUT
LOW
t_off = 60ns
HIGH
20.0ns/div
RESPONSE TO FAULT
EXTERNALLY
VMON2 FORCED FAULT
ON
IBIAS
t_fault = 14µs
OFF
FAULT LOW
ELECTRICAL
OUPUT
HIGH
10.0µs/div
VTC
FAULT
TX_DISABLE
LASER
OUPUT
FAULT RECOVERY TIME
EXTERNAL
FAULT REMOVED
10.0µs/div
VTC
FAULT
FREQUENT ASSERTION OF
TX_DISABLE
EXTERNALLY
FORCED FAULT
OV
TX_DISABLE
LASER
OUPUT
1.00ms/div
_______________________________________________________________________________________ 5
5 Page 
3.0V to 5.5V, 2.5Gbps VCSEL
and Laser Driver
1000
500ppm
1000ppm
1500ppm
2000ppm
2500ppm
3000ppm 3500ppm
10 5mA
RL = 25Ω
1
1
10mA
15mA
20mA
25mA
30mA
10 100
RMOD (kΩ)
1000
Figure 8. RTC vs. RMOD for Various Conditions
Determine Modulator Configuration
The MAX3996 can be used in several configurations.
For modulation currents less than 20mA, Maxim recom-
mends the configuration shown in the Typical
Application Circuit. Outputs greater than 20mA could
cause the voltage at the modulator output to be less
than VCC - 1V, which might degrade laser output. For
large currents, Maxim recommends the configuration in
Figure 9. A differential configuration is in Figure 10.
Designing the Bias Filter and
Output Pullup Beads
To reduce deterministic jitter, add a ferrite bead induc-
tor (L1) between the BIAS pin and the cathode of the
laser. Select L1 to have an impedance >100Ω between
f = 10MHz and f = 2GHz, and a DC resistance < 3Ω;
Maxim recommends the Murata BLM11HA102SG.
These inductors are also desirable for connecting the
OUT+ and OUT- pins to VCC.
Programming Laser Power and
Bias Fault Threshold
The IC is designed to drive a common anode laser with
a photodiode. A servo-control loop is formed by the
internal NPN bias-driving transistor, the laser diode, the
monitor diode (RSET), and the power-control amplifier
(Figure 11). The voltage at MD is stabilized to 1.1V. The
VCC
OPTIONAL SHUTDOWN
CIRCUITRY
VCC 1.8kΩ
VCC
TX_DISABLE
FAULT
0.01µF
IN+
0.01µF
IN-
VCC SHDNDRV
L2*
0.01µF
OUT-
VCC
MAX3996
L3*
OUT+
0.01µF
25Ω
L1*
PORDLY
BIAS
MD
TC MODSET MON1 MON2 COMP GND
CPORDLY
RTC RMOD
N.C.
CCOMP
RSET
0.01µF
TX_DISABLE
FAULT
0.01µF
IN+
0.01µF
IN-
VCC
VCC
MAX3996
VCC
L2*
SHDNDRV
0.01µF
OUT+
0.01µF
OUT-
L1*
PORDLY
BIAS
MD
TC MODSET MON1 MON2 COMP GND
CPORDLY
RTC
RMOD
N.C.
CCOMP
RSET
*FERRITE BEAD
Figure 9. Large Modulation Current
*FERRITE BEAD
Figure 10. Differential Configuration
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet MAX3996.PDF ] | |
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