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| 型号： | MAX3738ETG+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC LASER DRIVER 4.25GBPS 24TQFN |
| 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： | 4.25Gbps |
| 通道数： | 1 |
| 电源电压： | 2.97 V ~ 3.63 V |
| 电流 - 电源： | 47mA |
| 电流 - 调制： | 85mA |
| 电流 - 偏置： | 100mA |
| 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) |
155Mbps to 4.25Gbps SFF/SFP Laser Driver
with Extinction Ratio Control
Table 2. Circuit Responses to Various Single-Point Faults
PIN
TX_FAULT
TX_DISABLE
IN+
IN-
MD
SHUTDOWN
BIAS
OUT+
OUT-
PC_MON
BC_MON
APCFILT1
APCFILT2
MODSET
APCSET
CIRCUIT RESPONSE TO OVERVOLTATGE OR
SHORT TO V CC
Does not affect laser power.
Modulation and bias currents are disabled.
The optical average power increases, and a fault occurs
if V PC_MON exceeds the threshold. The APC loop
responds by decreasing the bias current.
The optical average power decreases and the APC loop
responds by increasing the bias current. A fault state
occurs if V BC_MON exceeds the threshold voltage.
This disables bias current. A fault state occurs.
Does not affect laser power. If the shutdown circuitry is
used, the laser current is disabled.
In this condition, the laser forward voltage is 0V and no
light is emitted.
The APC circuit responds by increasing the bias current
until a fault is detected; then a fault state* occurs.
Does not affect laser power.
Fault state* occurs.
Fault state* occurs.
I BIAS increases until V BC_MON exceeds the threshold
voltage.
I BIAS increases until V BC_MON exceeds the threshold
voltage.
Does not affect laser power.
Does not affect laser power.
CIRCUIT RESPONSE TO UNDERVOLTAGE OR
SHORT TO GROUND
Does not affect laser power.
Normal condition for circuit operation.
The optical average power decreases, and the APC loop
responds by increasing the bias current. A fault state
occurs if V BC_MON exceeds the threshold voltage.
The optical average power increases and a fault occurs
if V PC_MON exceeds the threshold. The APC loop
responds by decreasing the bias current.
The APC circuit responds by increasing the bias current
until a fault is detected; then a fault* state occurs.
Does not affect laser power.
Fault state* occurs. If the shutdown circuitry is used, the
laser current is disabled.
Fault state* occurs. If the shutdown circuitry is used, the
laser current is disabled.
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
I BIAS increases until V BC_MON exceeds the threshold
voltage.
I BIAS increases until V BC_MON exceeds the threshold
voltage.
Fault state* occurs.
Fault state* occurs.
*A fault state asserts the TX_FAULT pin, disables the modulation and bias currents, and asserts the SHUTDOWN pin.
Safety Circuitry
The safety circuitry contains a disable input
(TX_DISABLE), a latched fault output (TX_FAULT), and
fault detectors (Figure 5). This circuitry monitors the
operation of the laser driver and forces a shutdown if a
fault is detected (Table 1). The TX_FAULT pin should
be pulled high with a 4.7k Ω to 10k Ω resistor to V CC as
required by the SFP MSA. A single-point fault can be a
short to V CC or GND. See Table 2 to view the circuit
response to various single-point failure. The transmit
fault condition is latched until reset by a toggle or
TX_DISABLE or V CC . The laser driver offers redundant
laser diode shutdown through the optional shutdown
circuitry as shown in the Typical Application Circuit.
This shutdown transistor prevents a single-point fault at
the laser from creating an unsafe condition.
Safety Circuitry Current Monitors
The MAX3738 features monitors (BC_MON, PC_MON)
for bias current (I BIAS ) and photocurrent (I MD ). The
monitors are realized by mirroring a fraction of the cur-
rents and developing voltages across external resistors
connected to ground. Voltages greater than V REF at
PC_MON or BC_MON result in a fault state. For exam-
ple, connecting a 100 Ω resistor to ground at each mon-
itor output gives the following relationships:
V BC_MON = (I BIAS / 82) x 100 Ω
V PC_MON = I MD x 100 Ω
External sense resistors can be used for high-accuracy
measurement of bias and photodiode currents. On-chip
isolation resistors are included to reduce the number of
components needed to implement this function.
______________________________________________________________________________________
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX3738ETG+ | 功能描述:激光驱动器 155-4.25Gbps SFF/SFP w/Extinction RC 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 |
| MAX3738ETG+GD0 | 功能描述:激光驱动器 155Mbps to 4.25Gbps SFF/SFP Laser Driver with Extinction Ratio Control 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 |
| MAX3738ETG+T | 功能描述:激光驱动器 155-4.25Gbps SFF/SFP w/Extinction RC 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 |
| MAX3738ETG+TGD0 | 功能描述:激光驱动器 155Mbps to 4.25Gbps SFF/SFP Laser Driver with Extinction Ratio Control 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 |
| MAX3738ETG-T | 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 |
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