参数资料
| 型号： | MAX3669EHJ+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 10/13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： | 2,500 |
| 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： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
MAX3669
+3.3V, 622Mbps SDH/SONET
Laser Driver with Current Monitors and APC
R BIASMON ≤ 1.6V ?
? I BIASMAX ?
R MODMON ≤ 1V ? MOD ?
Calculate Power Consumption
The total power dissipation of the MAX3669 can be esti-
mated by the following:
P = V CC x I CC + (V CC - V f ) x I BIAS
+ I MOD (V CC - 20 Ω x I MOD / 2)
where I BIAS is the maximum bias current set by R BIAS-
MAX , I MOD is the modulation current, and V f is the typi-
cal laser forward voltage.
Applications Information
The following is an example of how to set up the
MAX3669.
Select Laser
A communication-grade laser should be selected for
622Mbps applications. Assume the laser output aver-
age power is P AVG = 0dBm, the minimum extinction
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:
Wavelength: λ = 1.3μm
In this example, I BIAS = 68.1mA. The Bias Current vs.
Maximum Bias Set Resistor graph in the Typical
Operating Characteristics shows that R BIASMAX should
be 3k Ω .
Determine R BIASMON
To avoid saturating the current mirror of BIASMON, the
voltage at this pin should not drop below (V CC - 1.6V).
The resulting condition is:
? A BIAS ?
?
where I BIASMAX is the maximum current expected for
the application.
Determine R MODMON
To avoid saturating the current mirror of MODMON, the
voltage at this pin should not drop below (V CC - 1V).
The resulting condition is:
? A ?
? I MOD ?
Threshold Current:
Ι TH = 22mA at +25°C
Threshold Temperature
Coefficient:
Laser to Monitor Transfer:
Laser Slope Efficiency:
β TH = 1.3%/°C
ρ MON = 0.2A/W
η = 0.05mW/mA
at +25°C
Determine R APCSET
Modulation Currents Exceeding 50mA
To drive modulation currents greater than 50mA at
3.3V, external pullup 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
above and below the supply voltage V CC .
The desired monitor diode current is estimated by
I MD = P AVG x ρ MON = 200μA. The Monitor Diode Current
vs. APC Set Resistor graph in the Typical Operating
Characteristics shows that R APCSET should be 6k Ω .
V CC
Determine R MODSET
To achieve a minimum extinction ratio (r e ) of 6.6dB 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) /
10 Ω
OUT-
OUT+
FERRITE
BEADS
LD
0.05(mW/mA) = 36.2mA. The Modulation Current vs.
Modulation Set Resistor graph (see Typical Operating
Characteristics) shows that R MODSET should be 5k Ω .
MAX3669
BIAS
C D
1 μ F
FERRITE BEAD
R D
5 Ω
R FILT
C FILT
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
10
MD
100pF
Figure 5. Output Termination for Maximum Modulation Current
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MAX3669ETG+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 |
| MAX3669ETGEVKIT | 功能描述:激光驱动器 Evaluation Kit for the MAX3669ETG 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-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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