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參數(shù)資料
| 型號： | MAX3296 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | MAX3296 Shortwave or VCSEL (Common Cathode) Evaluation Kit |
| 中文描述： | 3.0V至5.5V、1.25Gbps/2.5Gbps LAN激光驅(qū)動器 |
| 文件頁數(shù)： | 16/28頁 |
| 文件大小： | 1446K |
| 代理商： | MAX3296 |
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M
3.0V to 5.5V, 1.25Gbps/2.5Gbps
LAN Laser Drivers
16
______________________________________________________________________________________
Designing the Bias Filter and
Output Pullup Beads
To reduce deterministic jitter, add a ferrite-bead induc-
tor between the collector of the biasing transistor and
either the anode or the cathode of the laser, depending
on type (see the
Typical Operating Characteristics
).
Use a ferrite-bead inductor with an impedance >100
between = 10MHz and = 2GHz, and a DC resistance
<
3
.
Maxim
recommends
BLM11HA102SG. These inductors are also desirable
for tying the OUT+ and OUT- pins to V
CC
.
the
Murata
Designing the Laser-Compensation
Filter Network
Laser package inductance causes the laser impedance
to increase at high frequencies, leading to ringing, over-
shoot, and degradation of the output eye pattern. A laser-
compensation filter network can be used to reduce the
output load seen by the laser driver at high frequencies,
thereby reducing output ringing and overshoot.
The compensation components (R
COMP
and C
COMP
)
are most easily determined by experimentation. Begin
with R
COMP
= 25
and C
COMP
= 2pF. Increase C
COMP
until the desired transmitter eye is obtained (Figure 13).
Quick Shutdown
To reduce laser shutdown time, a FET device can be
attached to SHDNDRV as shown in Figure 10. This pro-
vides a typical laser power shutdown time of less than
10μs.
Applications Information
Laser Safety and IEC 825
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 MAX3286/
MAX3296 series provides features that facilitate compli-
ance with IEC 825.
A common safety requirement is single-point fault toler-
ance, whereby one unplanned short, open, or resistive
connection does not cause excess light output. When
these laser drivers are used, as shown in the
Typical
Application Circuits
, the circuits respond to faults as
listed in Table 5.
Using these laser drivers alone does not ensure that a
transmitter design is compliant with IEC 825. The entire
transmitter circuit and component 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 systems intended for surgical implant
into the body, for applications intended to support or sus-
tain life, or for any other application where the failure of
a Maxim product could create a situation where per-
sonal injury or death may occur.
Layout Considerations
The MAX3286/MAX3296 series comprises high-fre-
quency products. Their performance depends largely
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 is normally locat-
ed at BIASDRV. To prevent a second pole in the APC
(which can lead to oscillations), ensure that parasitic
capacitance at MD is minimized.
Common Questions
Laser output is ringing or contains overshoot.
This often is
caused by inductive laser packaging. Try reducing the
length of the laser leads. Modify the compensation com-
ponents to reduce the driver’s output edge speed (see
Design Procedure
). 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
BIASDRV
or
increasing the value of R
DEG
. Ensure that the parasitic
capacitance at the MD node is kept very small (<10pF).
The APC is not needed
. Connect FLTDLY to ground to
disable fault detection. Connect MD to REF and MON to
V
CC
. BIASDRV and SHDNDRV can be left open.
TIME
UNCOMPENSATED
CORRECTLY COMPENSATED
OVERCOMPENSATED
P
Figure 13. Laser Compensation
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX3296CGISEVKIT | MAX3296 Shortwave or VCSEL (Common Cathode) Evaluation Kit |
| MAX3296EVKIT-SW | MAX3296 Shortwave or VCSEL (Common Cathode) Evaluation Kit |
| MAX3297CUE | 3.0V to 5.5V, 1.25Gbps/2.5Gbps LAN Laser Drivers |
| MAX3286-MAX3299 | 3.0V to 5.5V, 1.25Gbps/2.5Gbps LAN Laser Drivers |
| MAX3288CUE | 32-Bit Digital Signal Controller with Flash 128-LQFP -40 to 85 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3296C/D | 功能描述:激光驅(qū)動器 3.0V to 5.5V 1.25Gbps/2.5Gbps LAN 激光驅(qū)動器 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 |
| MAX3296C/D DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX3296C/D-B50041 WAF | 制造商:Maxim Integrated Products 功能描述: |
| MAX3296CGI | 功能描述:激光驅(qū)動器 3.0V - 5.5V 1.25Gbp LAN 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 |
| MAX3296CGILEVKIT | 功能描述:電源管理IC開發(fā)工具 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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