参数资料
| 型号： | MAX3273ETG+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 11/18页 |
| 文件大小： | 0K |
| 描述： | IC LASR DRVR 2.7GBPS 3.6V 24TQFN |
| 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： | 2.7Gbps |
| 通道数： | 1 |
| 电源电压： | 3.14 V ~ 3.6 V |
| 电流 - 电源： | 30mA |
| 电流 - 调制： | 60mA |
| 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： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
+3.3V, 2.5Gbps Low-Power Laser Driver
Table 1. Optical Power Relations
PARAMETER
Average Power
Extinction Ratio
Optical Power of a 1
Optical Power of a 0
Optical Amplitude
Laser Slope Efficiency
Modulation Current
Threshold Current
Bias Current
Laser-to-Monitor Transfer
SYMBOL
P AVG
r e
P 1
P 0
P P-P
η
I MOD
I TH
I BIAS
ρ MON
RELATION
P AVG = (P 0 + P 1 ) / 2
r e = P 1 / P 0
P 1 = 2P AVG r e / (r e + 1)
P 0 = 2P AVG / (r e + 1)
P P-P = P 1 - P 0 = 2P AVG (r e - 1) / (r e + 1)
η = P P-P / I MOD
I MOD = P P-P / η
P 0 at 1 ≥ I TH
I BIAS ≥ I TH + I MOD / 2
I MD / P AVG
Note: Assuming a 50% average input duty cycle and mark density.
Applications Information
An example of how to set up the MAX3273 follows.
Select Laser
A communication-grade laser should be selected for
2.5Gbps/2.7Gbps applications. Assume the laser out-
put average power is P AVG = 0, 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 = 1310nm
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 1.81mW/
(0.05mW/mA) = 36.2mA. The I MOD vs. R MODSET graph
in the Typical Operating Characteristics shows that
R MODSET should be 5k Ω .
Determine R BIASMAX
Calculate the maximum threshold current (I TH(MAX) ) at
?
?
?
?
Threshold Current: I TH = 22mA at +25°C
Threshold Temperature Coefficient: β TH = 1.3%/°C
Laser-to-Monitor Transfer: ρ MON = 0.2A/W
Laser Slope Efficiency: η = 0.05mW/mA at +25°C
Determine R APCSET
T A = +85°C and end of life. Assuming I TH(MAX) =
50mA, the maximum bias current should be: I BIASMAX
= I TH(MAX) + (I MOD / 2). In this example, I BIASMAX =
68.1mA. The I BIASMAX vs. R BIASMAX graph in the
Typical Operating Characteristics shows that R BIASMAX
should be 3.5k Ω .
The desired monitor diode current is estimated by I MD
= P AVG × ρ MON = 200μA. The I MD vs. R APCSET graph
in the Typical Operating Characteristics shows that
R APCSET should be 7.5k Ω .
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相关代理商/技术参数 |
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| MAX3273EVKIT | 功能描述:激光驱动器 Evaluation Kit for the MAX3273 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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