參數(shù)資料
型號(hào)： MAX3735
廠(chǎng)商： Maxim Integrated Products, Inc.
英文描述： 2.7Gbps. Low-Power SFP Laser Drivers
中文描述： 2.7Gbps、低功耗、SFP激光驅(qū)動(dòng)器
文件頁(yè)數(shù)： 13/18頁(yè)
文件大?。?/td> 1734K
代理商： MAX3735
Input Termination Requirements
The MAX3735/MAX3735A data inputs are SFP MSA
compliant. On-chip 100
differential input impedance is
provided for optimal termination (Figure 6). Because of
the on-chip biasing network, the MAX3735/MAX3735A
inputs self-bias to the proper operating point to accom-
modate AC-coupling.
Optional Shutdown Output Circuitry
The SHUTDOWN control output features extended eye
safety when the laser cathode is grounded. An external
transistor is required to implement this circuit (Figure 4).
In the event of a fault, SHUTDOWN asserts high, plac-
ing the optional shutdown transistor in cutoff mode and
thereby shutting off the laser current.
Applications Information
An example of how to set up the MAX3735/MAX3735A
follows:
Select a communications-grade laser for 2.488Gbps.
Assume that the laser output average power is PAVG=
0dBm, the operating temperature is -40
°
C to +85
°
C,
minimum extinction ratio is 6.6 (8.2dB), and the laser
diode has the following characteristics:
Wavelength:
λ
= 1.3μm
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
x
ρ
MON
= 200μA. The Monitor Diode vs. R
APC-
SET
graph in the
Typical Operating Characteristics
sec-
tion shows that R
APCSET
should be 3k
. The value can
also be estimated using the equation below:
I
MD
= 1.23 / (2
×
R
APCSET
)
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 the results of the calcula-
tion are r
e
= 20 at +25
°
C, the peak-to-peak optical
power P
P-P
= 1.81mW, according to Table 3. The
required modulation current is 1.81mW / (0.05mW/mA)
= 36.2mA. The Modulation Current vs. R
MODSET
graph
in the
Typical Operating Characteristics
section shows
that R
MODSET
should be 9.5k
. The value can also be
estimated using the equation below:
I
MOD
= 1.23 / (0.0037
×
R
MODSET
)
Determine C
APC
In order to meet SFP timing requirements and minimize
pattern-dependent jitter, the CAPC capacitor value is
determined by the laser-to-monitor transfer and other
variables. The following equations and table can be
used to choose the CAPC values for the MAX3735 and
MAX3735A, respectively. The equations and table
assume a DC-coupled laser. Refer to Maxim
Application Note HFDN 23.0:
Choosing the APC Loop
M
2.7Gbps, Low-Power SFP Laser Drivers
______________________________________________________________________________________
13
24k
16k
50
50
PACKAGE
0.97nH
0.97nH
0.11pF
0.11pF
V
CC
V
CC
MAX3735
MAX3735A
V
CC
IN+
IN-
Figure 6. Simplified Input Structure
V
CC
OUT-
OUT+
PACKAGE
0.99nH
MAX3735
MAX3735A
0.81nH
OUT+
0.99nH
0.11pF
K = 0.3
0.11pF
0.11pF
Figure 7. Simplified Output Structure
相關(guān)PDF資料
PDF描述
MAX3735A 2.7Gbps. Low-Power SFP Laser Drivers
MAX3735AETG 2.7Gbps, Low-Power SFP Laser Drivers
MAX3735EGG 2.7Gbps, Low-Power SFP Laser Drivers
MAX3735ETG 2.7Gbps, Low-Power SFP Laser Drivers
MAX3738 1Gbps to 2.7Gbps SFF/SFP Laser Driver with Extinction Ratio Control
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX3735AE/D 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
MAX3735AE/D DIE 制造商:Maxim Integrated Products 功能描述:
MAX3735AEGG 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
MAX3735AEGG-T 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
MAX3735AETG 功能描述:激光驅(qū)動(dòng)器 2.7Gbps Low-Power SFP 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
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