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參數(shù)資料
| 型號： | MAX3996 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 3.0V to 5.5V, 2.5Gbps VCSEL and Laser Driver |
| 中文描述： | +3.0V至+5.5V、2.5Gbps VCSEL及激光驅(qū)動器 |
| 文件頁數(shù)： | 13/17頁 |
| 文件大?。?/td> | 785K |
| 代理商： | MAX3996 |
The compensation components (R
F
and C
F
) are most
easily determined by experimentation. For interfacing
with edge-emitting lasers, refer to application note
HFAN-2.0,
Interfacing Maxim Laser Drivers with Laser
Diodes
. Begin with R
F
= 50
and C
F
= 2pF. Increase
C
F
until the desired transmitter response is obtained
(Figure 12).
Using External Shutdown
To achieve single-point fault tolerance, Maxim recom-
mends an external shutdown transistor (Figure 11). In
the event of a fault, SHDNDRV asserts high, placing the
shutdown transistor in cutoff mode and thereby shutting
off the bias current.
Applications Information
Laser Safety and IEC825
The International Electrotechnical Commission (IEC)
determines standards for hazardous light emissions
from fiber optic transmitters. IEC 825 defines the maxi-
mum light output for various hazard levels. The
MAX3996 provides features that facilitate compliance
with IEC825. A common safety precaution is single-
point fault tolerance, whereby one unplanned short,
open, or resistive connection does not cause excess
light output. When this laser driver is used, as shown in
the
Typical Application Circuit
, the circuits respond to
faults as listed in Table 3. Using this laser driver alone
does not ensure that a transmitter design is compliant
with IEC825. The entire transmitter circuit and compo-
nent selections must be considered. Customers must
determine the level of fault tolerance required by their
applications, recognizing that Maxim products are not
designed or authorized for use as components in sys-
tems intended for surgical implant into the body, for
applications intended to support or sustain life, or for
any other application where the failure of a Maxim
product could create a situation where personal injury
or death may occur.
Layout Considerations
The MAX3996 is a high-frequency product whose per-
formance largely depends upon the circuit board layout.
Use a multilayer circuit board with a dedicated ground
plane. Use short laser-package leads placed close to
the modulator outputs. Power supplies must be capaci-
tively bypassed to the ground plane, with surface-mount
capacitors placed near the power-supply pins.
The dominant pole of the APC circuit normally is at
COMP. To prevent a second pole in the APC that can
lead to oscillations, ensure that parasitic capacitance at
MD is minimized (10pF).
Common Questions
Laser output is ringing or contains overshoot.
Induc-
tive laser packaging often causes this. Try reducing the
length of the laser leads. Modify the filter components to
reduce the driver
’
s output edge speed (see the
Design
Procedure
section). Extreme ringing can be caused by
low voltage at the OUT± pins. This might indicate that
pullup beads or a lower modulation current are needed.
Low-frequency oscillation on the laser output.
This
is more prevalent at low temperatures. The APC might
be oscillating. Try increasing the value of C
COMP
or
add additional degeneration by placing some resis-
tance from MON1 to GND. Ensure that the parasitic
capacitance at the MD node is kept very small (<10pF).
The APC is not needed.
Connect BIAS to V
CC
, leave
MD open, and connect MON2 and COMP to ground.
The modulator is not needed.
Leave TC and MODSET
open. Connect IN+ to V
CC
, IN- to ground through
750
, and leave OUT+ and OUT- open.
Interface Models
Figures 13
–
17 show typical models for the inputs and
outputs of the MAX3996, including package parasitics.
M
3.0V to 5.5V, 2.5Gbps VCSEL
and Laser Driver
______________________________________________________________________________________
13
TIME
P
UNCOMPENSATED
CORRECTLY COMPENSATED
OVERCOMPENSATED
Figure 12. Laser Compensation
MAX3996
4k
FAULT
NOTE:
THE FAULT PIN IS AN OPEN-COLLECTOR OUTPUT
Figure 13. FAULT Output
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3996CGP | 功能描述:激光驅(qū)動器 3-5.5V 2.5Gbps VCSEL & Laser Driver RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube |
| MAX3996CGP-T | 功能描述:激光驅(qū)動器 3-5.5V 2.5Gbps VCSEL & Laser Driver RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube |
| MAX3996CTP+ | 功能描述:激光驅(qū)動器 3-5.5V 2.5Gbps VCSEL & Laser Driver RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube |
| MAX3996CTP+D | 制造商:Maxim Integrated Products 功能描述:LASER DRVR VCSEL 2.5GBPS 1CH 20TQFN - Rail/Tube |
| MAX3996CTP+T | 功能描述:激光驅(qū)動器 3-5.5V 2.5Gbps VCSEL & Laser Driver RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube |
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