參數(shù)資料
型號(hào)： MAX3740AETG
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 其它接口
英文描述： Full-Duplex LVDM Transceiver 8-SOIC -40 to 85
中文描述： SPECIALTY INTERFACE CIRCUIT, QCC24
封裝： 4 X 4 MM, 0.80 MM PITCH, TQFN-24
文件頁(yè)數(shù)： 12/14頁(yè)
文件大?。?/td> 286K
代理商： MAX3740AETG
Programming Modulation Current
The modulation current output of the MAX3740A is con-
trolled by a resistor (R
MODSET
) placed between
MODSET and ground. The R
MODSET
resistor controls
the amount of current being sourced to the VCSEL. The
modulation current is given by the following:
It is important to note that the modulation current being
sourced by the MAX3740A is affected by the load
impedance of the VCSEL. The Modulation Current vs.
R
MODSET
graph in the
Typical Operating Characteristics
shows the current into a 50
electrical load.
Programming Bias Current
The bias current output of the MAX3740A is controlled
by a resistor (R
BIASSET
) placed between BIASSET and
ground. In open-loop operation the R
BIASSET
controls
the bias current level of the VCSEL. In closed-loop
operation the R
BIASSET
controls the maximum bias cur-
rent provided by the APC. The bias current is given by
the following:
The Bias Current vs. R
BIASSET
graph is also shown in
the
Typical Operating Characteristics
.
Photodiode S elec tion
To ensure stable operation of the APC circuit, the time
constant of the MD node should be shorter than the
APC time constant. (t
APC
= 5μs if C
APC
= 0.047μF).
For typical I
PD
= 400μA, R
PWRSET
= 500
, select a
photodiode with capacitance less than 500pF.
Programming Modulation-Current T empc o
Compute the required modulation tempco from the
slope efficiency of the laser at T
A
= +25
°
C and at a
higher temperature. Then select the value of R
TC
from
the
Typical Operating Characteristics
. For example,
suppose a laser has a slope efficiency (SE) of
0.021mW/mA at +25
°
C, which reduces to 0.018mW/mA
at +85
°
C. The temperature coefficient is given by the
following:
From the
Typical Operating Characteristics
, the value
of R
TC
, which offsets the tempco of the laser, is 9k
. If
modulation temperature compensation is not desired,
short TC1 and TC2.
Programming the APC Loop
Program the average optical power by adjusting
R
PWRSET
. To select the resistance, determine the
desired monitor current to be maintained over tempera-
ture and lifetime. See the Monitor Diode Current vs.
R
PWRSET
graph in the
Typical Operating Characteristics
section, and select the value of R
PWRSET
that corre-
sponds to the required current.
Input T ermination Requirements
The MAX3740A data inputs are SFP MSA compatible.
On-chip 100
differential input impedance is provided
for optimal termination (Figure 4). Because of the on-chip
biasing network, the MAX3740A inputs self-bias to the
proper operating point to accommodate AC-coupling.
Lasertempco
SE
SE
85 25
SE
2380
E
ppm C
=
(
×
/
×
=
(
)
)
85
25
25
1 6
tMD
tAPC
20
MD
MD
R
C
s
ns
≤
×
≤
μ
=
5
20
250
,
I
I
I
R
BIAS
BIASSET
BIAS
BIASSET
=
(
)
×
.
=
+
×
34
1 2
200
34
I
I
R
R
R
I
R
R
R
R
MOD
MODSET
OUT
+
+
OUT
LOAD
MOD
MODSET
OUT
+
+
OUT
LOAD
=
(
)
×
[
]
×
=
+
×
×
+
+
30
1
200
30
M
3.2Gbps S FP V CS EL Driver with Diagnostic
Monitors
12
______________________________________________________________________________________
MAX3740A
IN+
IN-
1nH
1nH
0.5pF
0.5pF
V
CC
50
50
16k
24k
V
CC
V
CC
PACKAGE
Figure 4. Simplified Input Structure
相關(guān)PDF資料
PDF描述
MAX3740 Full-Duplex LVDM Transceiver 8-MSOP -40 to 85
MAX3740ETG 3.2Gbps SFP VCSEL Driver with Diagnostic Monitors
MAX3741 Full-Duplex LVDM Transceiver 8-SOIC -40 to 85
MAX3741ETE Full-Duplex LVDM Transceiver 14-SOIC -40 to 85
MAX3746 Full-Duplex LVDM Transceiver 14-TSSOP -40 to 85
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX3740AETG+ 功能描述:激光驅(qū)動(dòng)器 3.2Gbps SFP VCSEL w/Diagnostic Mtr 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
MAX3740AETG+T 功能描述:激光驅(qū)動(dòng)器 3.2Gbps SFP VCSEL w/Diagnostic Mtr 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
MAX3740AETG-T 功能描述:激光驅(qū)動(dòng)器 3.2Gbps SFP VCSEL w/Diagnostic Mtr 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
MAX3740AEVKIT 功能描述:激光驅(qū)動(dòng)器 Evaluation Kit for the MAX3740A 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
MAX3740ETG 制造商:Maxim Integrated Products 功能描述:3.2GBPS SFP VCSEL DRIVER WITH DIAGNOSTIC MONI - Rail/Tube
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