参数资料
| 型号： | MAX3740AETG+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 9/15页 |
| 文件大小： | 0K |
| 描述： | IC DRIVER SFP VCSEL 24-TQFN |
| 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 |
| 数据速率： | 3.2Gbps |
| 通道数： | 1 |
| 电源电压： | 2.97 V ~ 3.63 V |
| 电流 - 电源： | 55mA |
| 电流 - 调制： | 15mA |
| 电流 - 偏置： | 15mA |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 包装： | 管件 |
| 安装类型： | 表面贴装 |
| 产品目录页面： | 1423 (CN2011-ZH PDF) |
3.2Gbps SFP VCSEL Driver with Diagnostic
Monitors
PWRMON
REF
CURRENT
R PWRSET
MD
1.8V
2X
POWER-
CONTROL
AMPLIFIER
MAX3740A
BIAS GENERATOR
I BIAS
34
AMPLIFIER
ENABLE
BIAS
FERRITE
SMOOTH-
BEAD
I PD
START
1.6V
(2V BE )
1.2V
I BIAS
9
BIASMON
R BIASMON
200 Ω
COMP
C COMP
Figure 1. Bias Generator
Detailed Description
The MAX3740A contains a bias generator with automat-
ic power control (APC), safety circuit, and a laser mod-
ulator with optional peaking compensation.
Bias Generator
Figure 1 shows the bias generator circuitry that contains
a power-control amplifier and smooth-start circuitry. An
internal PNP transistor provides DC laser current to bias
the laser in a light-emitting state. The APC circuitry
adjusts the laser-bias current to maintain average power
over temperature and changing laser properties. The
smooth-start circuitry prevents current spikes to the laser
during power-up or enable, ensuring compliance with
safety requirements and extending the life of the laser.
The MD input is connected to the cathode of a monitor
diode, which is used to sense laser power. The BIAS
output is connected to the anode of the laser through an
inductor or ferrite bead. The power-control amplifier dri-
ves a current amplifier to control the laser’s bias current.
During a fault condition, the bias current is disabled.
The PWRMON output provides a voltage proportional to
BIASSET
R BIASSET
The BIASMON output provides a current proportional to
the laser bias current given by:
I BIASMON = I BIAS / 9
When APC is not used (no monitor diode, open-loop
configuration) connect the COMP and PWRMON pins
to GND. In this mode, the bias current is set by the
resistor R BIASSET . When a closed-loop configuration is
used, connect a 1.7k Ω resistor between ground and
BIASSET to set the maximum bias current.
Safety Circuit
The safety circuit contains an input disable
(TX_DISABLE), a latched fault output (FAULT), and fault
detectors (Figure 2). This circuit monitors the operation
of the laser driver and forces a shutdown (disables
laser) if a fault is detected (Table 1). Table 2 contains
the circuit’s response to various single-point failures.
The transmit fault condition is latched until reset by a
toggle of TX_DISABLE or V CC . The FAULT pin should
be pulled high with a 4.7k Ω to 10k Ω resistor.
Table 1. Fault Conditions
average laser power given by:
V PWRMON = 2 ? I PD ? R PWRSET
PIN
BIAS
BIASMON
PWRMON
FAULT CONDITION
V BIAS > V CC - 0.2V
V BIASMON > 0.8V
V PWRMON > 0.8V
_______________________________________________________________________________________
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX3740AETG+ | 功能描述:激光驱动器 3.2Gbps SFP VCSEL w/Diagnostic Mtr 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 |
| MAX3740AETG+T | 功能描述:激光驱动器 3.2Gbps SFP VCSEL w/Diagnostic Mtr 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 |
| MAX3740AETG-T | 功能描述:激光驱动器 3.2Gbps SFP VCSEL w/Diagnostic Mtr 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 |
| MAX3740AEVKIT | 功能描述:激光驱动器 Evaluation Kit for the MAX3740A 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 |
| MAX3740ETG | 制造商:Maxim Integrated Products 功能描述:3.2GBPS SFP VCSEL DRIVER WITH DIAGNOSTIC MONI - Rail/Tube |
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