參數(shù)資料
型號(hào)： 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(dòng)器，帶有消光比控制
文件頁數(shù)： 12/14頁
文件大小： 403K
代理商： MAX3738
M
Current Compliance (I
MOD
≤
60mA),
DC-Coupled
The minimum voltage at the OUT+ and OUT- pins
is 0.7V.
For:
V
DIODE
= Diode bias point voltage (1.2V typ)
R
L
= Diode bias point resistance (5
typ)
R
D
= Series matching resistor (20
typ)
For compliance:
V
OUT+
= V
CC
- V
DIODE
- I
MOD
x (R
D
+ R
L
) -
I
BIAS
x R
L
≥
0.7V
Current Compliance (I
MOD
> 60mA),
AC-Coupled
For applications requiring modulation current greater
than 60mA, headroom is insufficient from proper opera-
tion of the laser driver if the laser is DC-coupled. To
avoid this problem, the MAX3738’s modulation output
can be AC-coupled to the cathode of a laser diode. An
external pullup inductor is necessary to DC-bias the
modulation output at V
CC
. Such a configuration isolates
laser forward voltage from the output circuitry and allows
the output at OUT+ to swing above and below the sup-
ply voltage (V
CC
). When AC-coupled, the MAX3738
modulation current can be programmed up to 85mA.
Refer to Maxim Application Note
HFAN 02.0: Interfacing
Maxim’s Laser Drivers to Laser Diodes
for more informa-
tion on AC-coupling laser drivers to laser diodes.
For compliance:
V
OUT+
= V
CC
- I
MOD
/ 2 x (R
D
+ R
L
)
≥
0.75V
Determine C
APC
The APC loop filter capacitor (C
APC
) must be selected
to balance the requirements for fast turn-on and mini-
mal interaction with low frequencies in the data pattern.
The low-frequency cutoff is:
C
APC
(μF)
68 / (f
3dB
(kHz) x (
η
x
ρ
MON
)
1.1
)
High-frequency noise can be filtered with an additional
cap, C
MD
, from the MD pin to ground.
C
MD
C
APC
/ 4
The MAX3738 is designed so turn-on time is faster than
1ms for most laser gain values (
η
x
ρ
MON
). Choosing a
smaller value of C
APC
reduces turn-on time. Careful
balance between turn-on time and low-frequency cutoff
may be needed at low data rates for some values of
laser gain.
Interface Models
Figures 6 and 7 show simplified input and output cir-
cuits for the MAX3738 laser driver. If dice are used,
replace package parasitic elements with bondwire par-
asitic elements.
1Gbps to 2.7Gbps SFF/SFP Laser Driver with
Extinction Ratio Control
12
______________________________________________________________________________________
V
CC
V
CC
V
CC
0.11pF
0.7nH
IN+
0.11pF
0.7nH
IN-
PACKAGE
5k
5k
24k
16k
MAX3738
Figure 6. Simplified Input Structure
MAX3738
PACKAGE
0.7nH
OUT-
0.7nH
OUT+
0.11pF
0.11pF
V
CC
Figure 7. Simplified Output Structure
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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(dòng)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(dòng)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(dòng)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(dòng)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(dòng)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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