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参数资料
| 型号： | SY88422LMG |
| 厂商： | Micrel Inc |
| 文件页数： | 9/10页 |
| 文件大小： | 0K |
| 描述： | IC LASR DRVR 4.25GBPS 3.6V 16MLF |
| 标准包装： | 100 |
| 类型： | 激光二极管驱动器（光纤） |
| 数据速率： | 4.25Gbps |
| 通道数： | 1 |
| 电源电压： | 3 V ~ 3.6 V |
| 电流 - 电源： | 35mA |
| 电流 - 调制： | 90mA |
| 电流 - 偏置： | 100mA |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 16-VFQFN 裸露焊盘，16-MLF? |
| 供应商设备封装： | 16-MLF?（3x3） |
| 包装： | 托盘 |
| 安装类型： | 表面贴装 |
| 产品目录页面： | 1089 (CN2011-ZH PDF) |
| 其它名称： | 576-2984 |
Micrel, Inc.
Application Hints
The typical applications drawing on the front page shows
how to connect the driver to the laser differentially. To
drive the laser single ended, just disconnect MOD- from
the laser anode and pull it up to V CC with a resistor equal
to the equivalent resistor of the load on MOD+, damping
resistor plus the laser equivalent resistor. Differential
drive improves transition time and laser response.
Driving the laser differentially will also minimize the cross
talk with the rest of the circuitry on the board especially
the receiver.
If we refer to Figure 3, the modulation current out of the
driver is split between the pull-up network and the laser.
If, for example, the total pull-up resistor is twice the sum
of the damping resistor and laser equivalent series
resistance, only two thirds (2/3) of the modulation current
will be used by the laser. To keep most of the
modulation current going through the laser, try to keep
the total pull-up resistors as high as possible. One
solution consists in using an inductor alone as pull-up,
SY88422L
current and zero ohm (0 ? ) path for the DC current
offering headroom for the driver equal to V CC and almost
all the modulation current goes into the laser. The
inductor alone will cause signal distortion, and, to
improve that, a combination of resistor and inductor can
be used as shown in Figure 3. In this case, the
headroom of the driver is VCC – R1 * α I mod , where α I mod
is the portion of the modulation current that goes through
the pull-up network.
The coupling capacitor creates a low-frequency cutoff in
the circuit, and its value must be chosen to
accommodate the lowest and the highest data rates. If
the value of the cap is too high, it will degrade the
performance at higher data rates, and, if its value is too
small, it won’t be able to hold a constant charge between
the first bit and the last bit of a long string of identical bits
in a low data rate application. This leads in both cases to
higher pattern-dependant jitter in the transmitter signal.
0.01 μ -to-0.1 μ F is found to be good range for all
applications from 155Mbps to 4.25Gbps.
presenting a high impedance path for the modulation
Figure 3. AC-Coupling the Laser to the Driver
November 2007
9
M9999-112607-A
hbwhelp@micrel.com or (408) 955-1690
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SY88422LMG TR | 功能描述:激光驱动器 4.25 Gbps LDD with Bias and Monitor Functions (I Temp, Lead Free) 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 |
| SY88422LMGTR | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:4.25Gbps Laser Driver with Integrated Bias |
| SY88432LMG | 功能描述:限幅放大器 3.3V, 4.25Gbps Optical Transceiver (Limiting Post Amp plus Laser Diode Driver) RoHS:否 制造商:Micrel 输入电压范围（最大值）:3.6 V 工作电源电压:3.3 V 电源电流:40 mA 工作温度范围:- 40 C to + 85 C 封装 / 箱体:MSOP-10 封装:Tube |
| SY88432LMG TR | 功能描述:限幅放大器 3.3V, 4.25Gbps Optical Transceiver (Limiting Post Amp plus Laser Diode Driver) RoHS:否 制造商:Micrel 输入电压范围（最大值）:3.6 V 工作电源电压:3.3 V 电源电流:40 mA 工作温度范围:- 40 C to + 85 C 封装 / 箱体:MSOP-10 封装:Tube |
| SY88702 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:5V 622Mbps LASER DIODE DRIVER WITH OUTPUT ENABLE |
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