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参数资料
| 型号： | MAX3996CTP+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC LASR DRVR 2.5GBPS 5.5V 20TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 类型： | 激光二极管驱动器（光纤） |
| 数据速率： | 2.5Gbps |
| 通道数： | 1 |
| 电源电压： | 3 V ~ 5.5 V |
| 电流 - 电源： | 52mA |
| 电流 - 调制： | 40mA |
| 电流 - 偏置： | 60mA |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 20-WFQFN 裸露焊盘 |
| 供应商设备封装： | 20-TQFN-EP（4x4） |
| 包装： | 管件 |
| 安装类型： | 表面贴装 |
3.0V to 5.5V, 2.5Gbps VCSEL
and Laser Driver
V CC
STARTUP
V BG
PORDLY
DELAY
SHDNDRV
Programming Modulation Current
Resistors at the MODSET and TC pins set the ampli-
tude of the modulation current. The resistor R MOD sets
the temperature-stable portion of the modulation cur-
rent, and the resistor (R TC) sets the temperature-
increasing portion of the modulation current. To
determine the appropriate temperature coefficient from
the slope efficiency ( η ) of the laser, use the following
equation:
TX_DISABLE
BIAS ENABLE
MODULATOR
LASER _ TEMPCO =
[ ppm / ° C ]
η 70 ? η 25
η 25 ( 70 ° C ? 25 ° C )
× 10 6
ENABLE
FAULT LATCH
R Q
FAULT
For example, if a laser has a slope efficiency η 25 =
0.021mW/mA, which reduces to η 70 = 0.018mW/mA.
Using the above equation will produce a laser tempco
BIAS FAULT 1
BIAS FAULT 2
TC FAULT
MODSET FAULT
S
of -3175ppm/ ° C.
To obtain the desired modulation current and tempco
for the device, the following equations can be used to
determine the required values of R MOD and R TC :
Figure 7. Safety Circuitry Functional Diagram
R TC =
250 ?
Tempco / 10 6 ( R TC + 250 ? ) 52
? 0 . 19 ? 48 × Tempco / 10 6 ?
Latched Fault Output
An open-collector FAULT output is provided with the
MAX3996. This output is latched until the power is
switched off, then on, or until TX_DISABLE is switched
to HIGH and then LOW.
Power-On Reset
The MAX3996 contains an internal power-on reset
delay to reject noise on V CC during power-on or hot-
plugging. Adding capacitance to the PORDLY pin can
extend the delay. The POR comparator includes hys-
teresis to improve noise rejection.
Design Procedure
Select Laser
Select a communications-grade laser with a rise time of
260ps or better for 1.25Gbps or 130ps or better for
2.5Gbps applications. To meet the MAX3996 ’ s AC
0 . 22
?
Tempco / 10 6 × i MOD
R MOD = ? 250 ?
? ?
where tempco = -laser tempco, 0 < tempco <
4000ppm/ ° C, and 2mA < i MOD < 30mA.
Figure 8 shows a family of curves derived from these
equations. The straight diagonal lines depict constant
tempcos. The curved lines represent constant modula-
tion currents. If no temperature compensation is
desired, leave TC open, and the equation for i MOD -
simplifies considerably.
The following equations were used to derive Figure 8 and
the equations at the beginning of this section.
specifications, the voltage at both OUT+ and OUT-
must remain above V CC - 1V at all times.
Use a high-efficiency laser that requires low modulation
i MOD = 77 ×
50
50 + R L
?
?
?
1 . 15
R MOD + 250 ?
+
( 1 + 0 . 004 ( T ? 25 ° C )) ? Amps
current and generates a low voltage swing. Trimming
the leads can reduce laser package inductance.
Typical package leads have inductance of 25nH per
inch (1nH/mm); this inductance causes a large voltage
swing across the laser. A compensation filter network
also can be used to reduce ringing, edge speed, and
voltage swing.
1 . 06
R TC + 250 ?
?
?
10
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX3996CTP+ | 功能描述:激光驱动器 3-5.5V 2.5Gbps VCSEL & Laser Driver RoHS:否 制造商:Micrel 数据速率:4.25 Gbps 工作电源电压:3 V to 3.6 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:QFN-16 封装: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:激光驱动器 3-5.5V 2.5Gbps VCSEL & Laser Driver RoHS:否 制造商:Micrel 数据速率:4.25 Gbps 工作电源电压:3 V to 3.6 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:QFN-16 封装:Tube |
| MAX3996CTP+TD | 制造商:Maxim Integrated Products 功能描述:LASER DRVR VCSEL 2.5GBPS 1CH 20TQFN - Tape and Reel |
| MAX3996EVKIT | 功能描述:激光驱动器 Evaluation Kit for the MAX3996 RoHS:否 制造商:Micrel 数据速率:4.25 Gbps 工作电源电压:3 V to 3.6 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:QFN-16 封装:Tube |
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