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參數(shù)資料
| 型號(hào)： | MAX3273EGG |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 其它接口 |
| 英文描述： | +3.3V, 2.5Gbps Low-Power Laser Driver |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, QCC24 |
| 封裝： | 4 X 4 MM, 0.90 MM HEIGHT, MO-220WGGD-2, QFN-24 |
| 文件頁數(shù)： | 11/15頁 |
| 文件大?。?/td> | 984K |
| 代理商： | MAX3273EGG |
M
+3.3V, 2.5Gbps Low-Power Laser Driver
______________________________________________________________________________________
11
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
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
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
.
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
.
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
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
.
PARAMETER
SYMBOL
RELATION
Average Power
P
AVG
P
AVG
= (P
0
+ P
1
) / 2
Extinction Ratio
r
e
r
e
= P
1
/ P
0
Optical Power of a 1
P
1
P
1
= 2P
AVG
r
e
/ (r
e
+ 1)
Optical Power of a 0
P
0
P
0
= 2P
AVG
/ (r
e
+ 1)
Optical Amplitude
P
P-P
P
P-P
= P
1
- P
0
= 2P
AVG
(r
e
- 1) / (r
e
+ 1)
Laser Slope Efficiency
η
η
= P
P-P
/ I
MOD
Modulation Current
I
MOD
I
MOD
= P
P-P
/
η
Threshold Current
I
TH
P
0
at 1
≥
I
TH
Bias Current
I
BIAS
I
BIAS
≥
I
TH
+ I
MOD
/ 2
Laser-to-Monitor Transfer
ρ
MON
I
MD
/ P
AVG
Note:
Assuming a 50% average input duty cycle and mark density.
Table 1. Optical Power Relations
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3273EGG-T | 功能描述:激光驅(qū)動(dòng)器 2.5Gbps Low-Power Laser Driver RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube |
| MAX3273ETG+ | 功能描述:激光驅(qū)動(dòng)器 2.5Gbps Low-Power Laser Driver RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube |
| MAX3273ETG+T | 功能描述:激光驅(qū)動(dòng)器 2.5Gbps Low-Power Laser Driver RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube |
| MAX3273EVKIT | 功能描述:激光驅(qū)動(dòng)器 Evaluation Kit for the MAX3273 RoHS:否 制造商:Micrel 數(shù)據(jù)速率:4.25 Gbps 工作電源電壓:3 V to 3.6 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-16 封裝:Tube |
| MAX3274UGE | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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