參數(shù)資料
型號(hào)： MAX3737ETJ
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 其它接口
英文描述： Full-Duplex LVDM Transceiver 8-MSOP -40 to 85
中文描述： SPECIALTY INTERFACE CIRCUIT, QCC32
封裝： 5 X 5 MM, 0.80 MM HEIGHT, TQFN-32
文件頁(yè)數(shù)： 11/17頁(yè)
文件大?。?/td> 920K
代理商： MAX3737ETJ
100
resistor to ground at each monitor output gives the
following relationships:
V
MC_MON
= (I
MOD
/ 268)
100
V
BC_MON
= (I
BIAS
/ 82)
100
V
PC_MON
= I
MD
100
External sense resistors can be used for high-accuracy
measurement of bias and photodiode currents. On-chip
isolation resistors are included to reduce the number of
components needed to implement this function.
Design Procedure
When designing a laser transmitter, the optical output is
usually expressed in terms of average power and
extinction ratio.
Table
3 gives relationships that are
helpful in converting between the optical average
power and the modulation current. These relationships
are valid if the mark density and duty cycle of the opti-
cal waveform are 50%.
For a desired laser average optical power (P
AVG
) and
optical extinction ratio (r
e
), the required bias and modula-
tion currents can be calculated using the equations in
Table
3. Proper setting of these currents requires knowl-
edge of the laser to monitor transfer (
ρ
MON
) and slope
efficiency (
η
).
Programming the Monitor Diode Current
Set Point
The MAX3737 operates in APC mode at all times. The
bias current is automatically set so average laser power
is determined by the APCSET resistor:
The APCSET pin controls the set point for the monitor-
diode current. An internal current regulator establishes
the APCSET current in the same manner as the MODSET
pin. See the I
MD
vs. R
APCSET
graph in the
Typical
Operating Characteristics
and select the value of R
APC-
SET
that corresponds to the required current at +25
°
C:
The laser driver automatically adjusts the bias to maintain
the constant average power. For DC-coupled laser diodes:
Programming the Modulation Current with
Compensation
Determine the modulation current from the laser slope
efficiency:
The modulation current of the MAX3737 consists of a
static modulation current (I
MODS
), a current proportional
to I
BIAS,
and a current proportional to temperature. The
portion of I
MOD
set by MODSET is established by an
internal current regulator, which maintains the reference
voltage of V
REF
across the external programming resis-
tor. See to the I
MOD
vs. R
MODSET
graph in the
Typical
Operating Characteristics
and select the value of R
MOD-
SET
that corresponds to the required current at +25
°
C:
I
P
r
r
e
MOD
AVG
η
e
=
×
×
+
2
1
1
-
I
I
I
AVG
BIAS
MOD
2
=
+
I
V
R
MD
REF
APCSET
=
×
1
2
P
I
AVG
MD
MON
=ρ
M
Multirate Laser Driver with Extinction
Ratio Control
______________________________________________________________________________________
11
PARAMETER
SYMBOL
P
AVG
r
e
P
1
P
0
P
P-P
η
I
MOD
I
TH
I
BIAS
ρ
MON
RELATION
P
AVG
= (P
0
+ P
1
) / 2
r
e
= P
1
/ P
0
P
1
= 2P
AVG
r
e
/ (r
e
+ 1)
P
0
= 2P
AVG
/ (r
e
+ 1)
P
P-P
= P
1
- P
0
η
= P
P-P
/ I
MOD
I
MOD
= P
P-P
/
η
P
0
at I
≥
I
TH
I
BIAS
≥
I
TH
+ I
MOD
/ 2
I
MD
/ P
AVG
Average power
Extinction ratio
Optical power of a 1
Optical power of a zero
Optical amplitude
Laser slope efficiency
Modulation current
Threshold current
Bias current (AC-coupled)
Laser to monitor transfer
Note:
Assuming a 50% average input duty cycle and mark density.
Table 3. Optical Power Relations
相關(guān)PDF資料
PDF描述
MAX3737 Multirate Laser Driver with Extinction Ratio Control
MAX3737EGJ Multirate Laser Driver with Extinction Ratio Control
MAX3740A Full-Duplex LVDM Transceiver 8-MSOP -40 to 85
MAX3740AETG Full-Duplex LVDM Transceiver 8-SOIC -40 to 85
MAX3740 Full-Duplex LVDM Transceiver 8-MSOP -40 to 85
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX3737ETJ+ 功能描述:激光驅(qū)動(dòng)器 Multirate w/Extinct 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
MAX3737ETJ+T 功能描述:激光驅(qū)動(dòng)器 Multirate w/Extinct 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
MAX3737ETJ-T 功能描述:激光驅(qū)動(dòng)器 Multirate w/Extinct 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
MAX3737EVKIT 功能描述:激光驅(qū)動(dòng)器 Evaluation Kit for the MAX3737 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 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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