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參數(shù)資料
| 型號： | MAX3865EGJ |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 其它接口 |
| 英文描述： | 2.5Gbps Laser Driver with Automatic Modulation Control |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, CQCC32 |
| 封裝： | 5 X 5 MM, 0.90 MM HEIGHT, QFN-32 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 633K |
| 代理商： | MAX3865EGJ |
M
Warning Outputs
A TTL-compatible, active-low warning flag,
FAIL
, is set
when:
One or more of the programmable currents is set at
greater than 150% of the rated maximum for the
chip. A shorted programming resistor would cause
this warning. In this case, the bias and modulation
outputs are shut down to protect the laser.
Average I
MD
≠
I
APCSET
in the APC or AMC mode. This
could be caused by too low a setting for maximum
I
BIAS
or by a laser that has exceeded its useful life.
Peak-to-peak I
MD
≠
I
AMCSET
in the AMC mode. This
could be caused by too low a setting for I
MODMAX
or
by a laser which has exceeded its useful life.
The
FAIL
flag also is set for a few microseconds follow-
ing power-up, until the servo loops settle. The BIASMON
and MODMON pins can be used to monitor the laser
current and predict the end of the useful laser life before
a failure occurs.
Design Procedure
When designing a laser transmitter, the optical output is
usually expressed in terms of average power and
extinction ratio. Table 2 gives relationships that are
helpful in converting between the optical power and the
modulation current. These relationships are valid if the
mark density and duty cycle of the optical waveform
are 50%.
For a desired laser average optical power, P
AVG
, and
optical extinction ratio, r
e
, the required modulation cur-
rent can be calculated based on the laser slope effi-
ciency,
η
, using the equations in Table 2.
2.5Gbps Laser Driver with Automatic
Modulation Control
8
_______________________________________________________________________________________
MAX3865
DATA-
DATA+
CLK+
CLK-
+5V
V
C
R
E
E
R
MODMAX
R
BIASMAX
R
APCSET
R
AMCSET
M
B
A
A
20
20
15
20
MODN
MODQ
BIAS
BIAS_X
MD
+5V
I
MODQ
I
BIAS
I
MD
Figure 3. DC-Coupled Laser Circuit
PARAMETER
Average Power
Extinction Ratio
Optical Power of a
“
1
”
Optical Power of a
“
0
”
SYMBOL
P
AVG
r
e
RELATION
P
AVG
= (P
0
+ P
1
)/2
r
e
= P
1
/ P
0
P
1
P
1
= 2P
AVG
r
e
/( r
e
+ 1)
P
0
P
0
= 2P
AVG
/( r
e
+ 1)
Optical Amplitude
Laser Slope
Efficiency
Laser to Monitor
Diode Transfer
Note:
Assuming a 50% average input duty cycle and mark density.
Pp-p
Pp-p = P
1
- P
0
η
η
= Pp-p/I
MOD
ρ
MON
ρ
MON
= I
MD
/ P
AVG
Table 2. Optical Power Relations
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3866E/D DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX3867E/D DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX3867ECM | 功能描述:激光驅(qū)動器 Integrated Circuits (ICs) 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 |
| MAX3869E/D | 功能描述:激光驅(qū)動器 DICE SALES DICE12 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 |
| MAX3869E/D DIE | 制造商:Maxim Integrated Products 功能描述: |
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