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| 型号： | MAX3735AETG+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 11/18页 |
| 文件大小： | 0K |
| 描述： | IC LSR DRVR 2.7GBPS 3.63V 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： | 2.7Gbps |
| 通道数： | 1 |
| 电源电压： | 2.97 V ~ 3.63 V |
| 电流 - 电源： | 27mA |
| 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) |
2.7Gbps, Low-Power SFP Laser Drivers
V CC
TX_DISABLE
POR AND COUNTER
FOR t_init
MAX3735
MAX3735A
I MOD
ENABLE
COUNTER FOR
t_onfault
V CC
100ns DELAY
I BIAS
ENABLE
R PC_MON
PC_MON
V CC
I MD
1
V BG
COMP
R
RS
LATCH
Q
SHUTDOWN
S
I BIAS
V BG
CMOS
BC_MON
76
TX_FAULT
R BC_MON
MODSET
SHORT-
CIRCUIT
COMP
TTL
OPEN COLLECTOR
DETECTOR
Figure 5. Safety Circuitry
Table 1. Typical Fault Conditions
section, and select the value of R MODSET that corre-
sponds to the required current at +25°C.
1.
2.
If any of the I/O pins is shorted to GND or V CC (single-
point failure, see Table 2), and the bias current or the
photocurrent exceed the programmed threshold.
End-of-life (EOL) condition of the laser diode. The bias
current and/or the photocurrent exceed the
programmed threshold.
Programming the APC Loop
Program the average optical power by adjusting -R APC-
SET . To select the resistance, determine the desired moni-
tor current to be maintained over temperature and
lifetime. See the Monitor Diode Current vs. R APCSET
graph in the Typical Operating Characteristics section,
and select the value of R APCSET that corresponds to the
3.
Laser cathode is grounded and the photocurrent
exceeds the programmed thresholds.
required current.
Interfacing with Laser Diodes
No feedback for the APC loop (broken interconnection,
To minimize optical output aberrations caused by sig-
4.
defective monitor photodiode), and the bias current
nal reflections at the electrical interface to the laser
exceeds the programmed threshold.
Design Procedure
When designing a laser transmitter, the optical output
usually is expressed in terms of average power and
extinction ratio. Table 3 shows relationships helpful in
converting between the optical average power and the
modulation current. These relationships are valid if the
mark density and duty cycle of the optical waveform
are 50%.
Programming the Modulation Current
For a given laser power (P AVG ), slope efficiency ( η ), and
extinction ratio (r e ), the modulation current can be calcu-
lated using Table 3. See the Modulation Current vs.
R MODSET graph in the Typical Operating Characteristics
diode, a series-damping resistor (R D ) is required
(Figure 4). Additionally, the MAX3735/MAX3735A out-
puts are optimized for a 15 ? load. Therefore, the series
combination of R D and R L , where R L represents the
laser-diode resistance, should equal 15 ? . Typical val-
ues for R D are 8 ? to 13 ? . For best performance, place
a bypass capacitor (0.01μF typ) as close as possible to
the anode of the laser diode. An RC shunt network
between the laser cathode and ground minimizes opti-
cal output aberrations. Starting values for most coaxial
lasers are R COMP = 50 ? in series with C COMP = 8pF.
Adjust these values experimentally until the optical out-
put waveform is optimized. Refer to Maxim Application
Note: HFAN 02.0: Interfacing Maxim’s Laser Drivers to
Laser Diodes for more information.
______________________________________________________________________________________
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX3735AETG+ | 功能描述:激光驱动器 2.7Gbps Low-Power SFP 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 |
| MAX3735AETG+T | 功能描述:激光驱动器 2.7Gbps Low-Power SFP 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 |
| MAX3735AETG-T | 功能描述:激光驱动器 2.7Gbps Low-Power SFP 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 |
| MAX3735AEVKIT | 功能描述:激光驱动器 Evaluation Kit for the MAX3735A 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 |
| MAX3735E/D | 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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