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参数资料
| 型号： | MAX3669EHJ+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 7/13页 |
| 文件大小： | 0K |
| 描述： | IC LASR DRVR 622MBPS 5.5V 32TQFP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 360 |
| 类型： | 激光二极管驱动器（光纤） |
| 数据速率： | 622Mbps |
| 通道数： | 1 |
| 电源电压： | 3.14 V ~ 5.5 V |
| 电流 - 电源： | 40mA |
| 电流 - 调制： | 75mA |
| 电流 - 偏置： | 80mA |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 32-TQFP |
| 供应商设备封装： | 32-TQFP（5x5） |
| 包装： | 托盘 |
| 安装类型： | 表面贴装 |
MAX3669
+3.3V, 622Mbps SDH/SONET
Laser Driver with Current Monitors and APC
DATA+
DATA-
V CC
100k Ω
I MOD
OUT+
OUT-
V CC
ENABLE
R BIASMON
MAX3669
165X
40X
I BIAS
BIAS
V CC
R MODMON
I BIAS
38
I MOD
5X
I MD
MD
29
FAILURE
DETECTOR
MODSET
BIASMAX
CAPC
APCSET
FAIL
R MODSET
R BIASMAX
C APC
R APCSET
Figure 3. Functional Diagram
Detailed Description
The MAX3669 laser driver consists of three main parts:
a high-speed modulation driver, a laser-biasing block
with automatic power control (APC), and bias current
and modulation current monitors. The circuit is opti-
mized for low-voltage (+3.3V) operation.
The output stage is composed of a high-speed differential
pair and a programmable modulation current source.
Since the modulation output drives a maximum current
of 75mA into the laser with a 230ps edge speed, large
transient voltage spikes can be generated due to the
parasitic inductance. These transients and the laser for-
ward voltage leave insufficient headroom for the proper
operation of the laser driver if the modulation output is
DC-coupled to the laser diode. To solve this problem,
the MAX3669’s modulation output is designed to be
Maxim Integrated
AC-coupled to the cathode of a laser diode. A simpli-
fied functional diagram is shown in Figure 3.
The MAX3669 modulation output is optimized for driv-
ing a 20 Ω ?? 10 Ω load; the minimum required voltage at
OUT+ is 2.0V. Modulation current swings of 75mA are
possible. To interface with the laser diode, a damping
resistor (R D ) is required for impedance matching. An
RC shunt network may be used to compensate for the
laser-diode parasitic inductance, thereby improving the
optical output aberrations and duty-cycle distortion.
At a 622Mbps data rate, any capacitive load at the cath-
ode of a laser diode degrades the optical output perfor-
mance. Since the BIAS output is directly connected to the
laser cathode, minimize the parasitic capacitance associ-
ated with this pin by using an inductor to isolate the BIAS
pin from the laser diode.
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX3669EHJ+ | 功能描述:激光驱动器 3.3V 622Mbps SDH/SONET 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 |
| MAX3669EHJ+T | 功能描述:激光驱动器 3.3V 622Mbps SDH/SONET 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 |
| MAX3669EHJ-T | 功能描述:激光驱动器 3.3V 622Mbps SDH/SONET 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 |
| MAX3669ETG | 功能描述:激光驱动器 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 |
| MAX3669ETG+ | 功能描述:激光驱动器 3.3V 622Mbps SDH/SONET 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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