參數(shù)資料
型號： MAX3738
廠商： Maxim Integrated Products, Inc.
英文描述： 1Gbps to 2.7Gbps SFF/SFP Laser Driver with Extinction Ratio Control
中文描述： 155Mbps至4.25Gbps SFF/SFP激光驅(qū)動器，帶有消光比控制
文件頁數(shù)： 7/14頁
文件大?。?/td> 403K
代理商： MAX3738
Detailed Description
The MAX3738 laser driver consists of three main parts:
a high-speed modulation driver, biasing block with
ERC, and safety circuitry. The circuit design is opti-
mized for high-speed, low-voltage (+3.3V) operation
(Figure 4).
High-Speed Modulation Driver
The output stage is composed of a high-speed differ-
ential pair and a programmable modulation current
source. The MAX3738 is optimized for driving a 15
load. The minimum instantaneous voltage required at
OUT- is 0.7V for modulation currents up to 60mA and
0.75V for currents from 60mA to 85mA. Operation
above 60mA can be accomplished by AC-coupling or
with sufficient voltage at the laser to meet the driver
output voltage requirement.
To interface with the laser diode, a damping resistor
(R
D
) is required. The combined resistance damping
resistor and the equivalent series resistance (ESR) of
the laser diode should equal 15
. To further damp
aberrations caused by laser diode parasitic induc-
tance, an RC shunt network may be necessary. Refer to
Maxim Application Note
HFAN 0.0: Interface Maxim’s
Laser Driver to Laser Diode
for more information.
At data rates of 2.7Gbps, any capacitive load at the
cathode of a laser diode degrades optical output perfor-
mance. Because the BIAS output is directly connected
to the laser cathode, minimize the parasitic capacitance
associated with the pin by using an inductor to isolate
the BIAS pin parasitics form the laser cathode.
Extinction Ratio Control
The extinction ratio (r
e
) is the laser on-state power
divided by the off-state power. Extinction ratio remains
constant if peak-to-peak and average power are held
constant:
r
e
= (2P
AVG
+ P
P-P
) / (2P
AVG
- P
P-P
)
M
1Gbps to 2.7Gbps SFF/SFP Laser Driver with
Extinction Ratio Control
_______________________________________________________________________________________
7
V
IN+
V
IN-
200mV (min)
2400mV (max)
100mV (min)
1200mV (max)
I
MOD
VOLTAGE
CURRENT
TIME
SINGLE ENDED
DIFFERENTIAL
(V
IN+
) - (V
IN-
)
I
OUT+
Figure 1. Required Input Signal and Output Polarity
MAX3738
30
30
30
75
50
OUT+
OUT-
V
CC
V
CC
OSCILLOSCOPE
Z
0
= 30
Z
0
= 30
Z
0
= 50
0.5pF
I
OUT+
Figure 2. Test Circuit for Characterization
L1
1
μ
H
C1
0.1
μ
F
C3
0.1
μ
F
C2
10
μ
F
VOLTAGE
SUPPLY
SOURCE
NOISE
OPTIONAL
OPTIONAL
FILTER DEFINED BY SFP MSA
HOST BOARD
MODULE
TO LASER
DRIVER V
CC
Figure 3. Supply Filter
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX3738ETG 功能描述:激光驅(qū)動器 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
MAX3738ETG+ 功能描述:激光驅(qū)動器 155-4.25Gbps SFF/SFP w/Extinction RC 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
MAX3738ETG+GD0 功能描述:激光驅(qū)動器 155Mbps to 4.25Gbps SFF/SFP Laser Driver with Extinction Ratio Control 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
MAX3738ETG+T 功能描述:激光驅(qū)動器 155-4.25Gbps SFF/SFP w/Extinction RC 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
MAX3738ETG+TGD0 功能描述:激光驅(qū)動器 155Mbps to 4.25Gbps SFF/SFP Laser Driver with Extinction Ratio Control 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
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