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| 型号： | MAX3668EHJ+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC LSR DRVR 622MBPS 3.63V 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： | 38mA |
| 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 |
| 产品目录页面： | 1423 (CN2011-ZH PDF) |
+3.3V, 622Mbps SDH/SONET
Laser Driver with Automatic Power Control
ratio is r e = 6.6 (8.2dB), the operating temperature is
-40°C to +85°C, and the laser diode has the following
characteristics:
Wire Bonding Die
For high current density and reliable operation, the
MAX3668 uses gold metalization. Make connections to
Wavelength:
Threshold Current:
Threshold Temperature
Coefficient:
Laser to Monitor Transfer:
Laser Slope Efficiency:
λ = 1.3μm
Ι TH = 22mA at +25°C
β TH = 1.3%/°C
ρ MON = 0.2A/W
η = 0.05mW/mA
the die with gold wire only, using ball-bonding tech-
niques. Wedge bonding is not recommended. Die-pad
size is 4 mils (100μm) square, and die thickness is 12
mils (300μm) mils.
Layout Considerations
To minimize inductance, keep the connections between
the MAX3668 output pins and LD as close as possible.
at +25°C
Determine R APCSET
The desired monitor diode current is estimated by
I MD = P AVE × ρ MON = 200μA. The Monitor Diode Current
vs. APC Set Resistor graph in the Typical Operating
Characteristics shows that R APCSET should be 6k ? .
Determine R MODSET
To achieve a minimum extinction ratio (r e ) of 6.6 over
temperature and lifetime, calculate the required extinc-
tion ratio at +25°C. Assuming r e = 20, the peak-to-peak
optical power P p-p = 1.81mW according to Table 1. The
required modulation current is 1.81(mW) / 0.05(mW/mA)
= 36.2mA. The Modulation Current vs. Modulation Set
Resistor graph in the (see Typical Operating Characteri-
stics) shows that R MODSET should be 5k ? .
Determine R BIASMAX
Calculate the maximum threshold current (I TH(MAX) ) at
T A = +85°C and end of life. Assuming I TH(MAX) =
50mA, the maximum bias current should be:
I BIAS = I TH(MAX) + I MOD / 2
In this example, I BIAS = 68.1mA. The Bias Current vs.
Optimize the laser diode performance by placing a
bypass capacitor as close as possible to the laser
anode. Use good high-frequency layout techniques
and multilayer boards with uninterrupted ground planes
to minimize EMI and crosstalk.
Laser Safety and IEC 825
Using the MAX3668 laser driver alone does not ensure
that a transmitter design is compliant with IEC 825. The
entire transmitter circuit and component selections must
be considered. Customers must determine the level of
fault tolerance required by their application, recognizing
that Maxim products are not designed or authorized for
use as components in systems intended for surgical
implant into the body, for applications intended to sup-
port or sustain life, or for any other application where the
failure of a Maxim product could create a situation
where personal injury or death may occur.
V CC
Maximum Bias Set Resistor graph in the Typical
Operating Characteristics shows that R BIASMAX should
be 3k ? .
Modulation Current More than 50mA
10 ?
OUT-
FERRITE
BEADS
C D
R D
LD
To drive modulation currents greater than 50mA at
3.3V, external pull-up inductors (Figure 5) should be
used to DC-bias the modulation output at V CC . Such a
configuration isolates the laser forward voltage from the
output circuitry and allows the output at OUT+ to swing
OUT+
MAX3668
BIAS
1.0 μ F
FERRITE BEAD
5 ?
R FILT
C FILT
above and below the supply voltage V CC .
At +5V power supply, the headroom voltage for the
MAX3668 is significantly improved. In this case, it is
possible to achieve a modulation current of more than
50mA (using resistor pull-ups as shown in the Typical
Operating Circuit ). The MAX3668 can also be DC-coupled
to a laser diode when operating at +5V supply; the volt-
age at OUT+ should be ≥ 2.0V for proper operation.
MD
1000pF
Figure 5. Output Termination for Maximum Modulation Current
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX3668EHJ+ | 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 |
| MAX3668EHJ+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 |
| MAX3668EHJ-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 |
| MAX3668EVKIT | 功能描述:激光驱动器 Evaluation Kit for the MAX3668 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 |
| MAX3669E/D | 功能描述:激光驱动器 DICE SALES DICE12 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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