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參數(shù)資料
| 型號(hào)： | MAX3740A |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Full-Duplex LVDM Transceiver 8-MSOP -40 to 85 |
| 中文描述： | 3.2Gbps、SFP VCSEL驅(qū)動(dòng)器，帶有診斷監(jiān)視器 |
| 文件頁數(shù)： | 13/14頁 |
| 文件大?。?/td> | 286K |
| 代理商： | MAX3740A |
M
3.2Gbps S FP V CS EL Driver with Diagnostic
Monitors
______________________________________________________________________________________
13
Applic ations Information
Interface Models
Figures 4 and 5 show simplified input and output circuits
for the MAX3740A laser driver. Figure 6 shows the fault
circuit interface.
Layout Considerations
To minimize inductance, keep the connections between
the MAX3740A output pins and laser diode as short as
possible. Use good high-frequency layout techniques
and multilayer boards with uninterrupted ground planes
to minimize EMI and crosstalk.
Designing the Compensation Filter
Network
Laser package inductance causes the laser impedance
to increase at high frequencies, leading to ringing, over-
shoot, and degradation of the laser output. A laser com-
pensation filter network can be used to reduce the laser
impedance at high frequencies, thereby reducing output
ringing and overshoot.
The compensation components (R
F
and C
F
) are most
easily determined by experimentation. Begin with R
F
=
50
and C
F
= 1pF. Increase C
F
until the desired trans-
mitter response is obtained (Figure 7). Refer to
Application Note HFAN-2-0:
Interfacing Maxim Laser
Drives with Laser Diodes
for more information.
Exposed-Pad (EP) Package
The exposed pad on the 24-pin thin QFN provides a very
low thermal resistance path for heat removal from the IC.
The pad is also electrical ground on the MAX3740A and
must be soldered to the circuit board ground for proper
thermal and electrical performance. Refer to Maxim
Application Note HFAN-08.1:
Thermal Considerations for
QFN and Other Exposed-Pad Packages
for additional
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 maximum
light output for various hazard levels. The MAX3740A
provides features that facilitate compliance with IEC 825.
A common safety precaution is single-point fault toler-
ance, whereby one unplanned short, open, or resistive
connection does not cause excess light output. Using
this laser driver 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 com-
ponents in systems 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.
V
CC
MAX3740A
PACKAGE
1nH
1nH
0.5pF
0.5pF
OUT-
OUT+
R
OUT+
R
OUT-
Figure 5. Simplified Output Structure
TIME
P
UNCOMPENSATED
CORRECTLY COMPENSATED
OVERCOMPENSATED
Figure 7. Laser Compensation
MAX3740A
V
CC
FAULT
Figure 6. Fault Circuit Interface
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PDF描述 |
|---|---|
| MAX3740AETG | Full-Duplex LVDM Transceiver 8-SOIC -40 to 85 |
| MAX3740 | Full-Duplex LVDM Transceiver 8-MSOP -40 to 85 |
| MAX3740ETG | 3.2Gbps SFP VCSEL Driver with Diagnostic Monitors |
| MAX3741 | Full-Duplex LVDM Transceiver 8-SOIC -40 to 85 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3740AETG | 功能描述:激光驅(qū)動(dòng)器 3.2Gbps SFP VCSEL w/Diagnostic Mtr 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 |
| MAX3740AETG+ | 功能描述:激光驅(qū)動(dòng)器 3.2Gbps SFP VCSEL w/Diagnostic Mtr 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 |
| MAX3740AETG+T | 功能描述:激光驅(qū)動(dòng)器 3.2Gbps SFP VCSEL w/Diagnostic Mtr 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 |
| MAX3740AETG-T | 功能描述:激光驅(qū)動(dòng)器 3.2Gbps SFP VCSEL w/Diagnostic Mtr 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 |
| MAX3740AEVKIT | 功能描述:激光驅(qū)動(dòng)器 Evaluation Kit for the MAX3740A 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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