參數(shù)資料
型號(hào)： MAX3996CGP
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 其它接口
英文描述： 3.0V to 5.5V, 2.5Gbps VCSEL and Laser Driver
中文描述： SPECIALTY INTERFACE CIRCUIT, CQCC20
封裝： 4 X 4 MM, 0.90 MM HEIGHT, QFN-20
文件頁(yè)數(shù)： 10/17頁(yè)
文件大小： 785K
代理商： MAX3996CGP
M
Latched Fault Output
An open-collector FAULT output is provided with the
MAX3996. This output is latched until the power is
switched off, then on, or until TX_DISABLE is switched
to HIGH and then LOW.
Power-On Reset
The MAX3996 contains an internal power-on reset
delay to reject noise on V
CC
during power-on or hot-
plugging. Adding capacitance to the PORDLY pin can
extend the delay. The POR comparator includes hys-
teresis to improve noise rejection.
Design Procedure
Select Laser
Select a communications-grade laser with a rise time of
260ps or better for 1.25Gbps or 130ps or better for
2.5Gbps applications. To meet the MAX3996
’
s AC
specifications, the voltage at both OUT+ and OUT-
must remain above V
CC
- 1V at all times.
Use a high-efficiency laser that requires low modulation
current and generates a low voltage swing. Trimming
the leads can reduce laser package inductance.
Typical package leads have inductance of 25nH per
inch (1nH/mm); this inductance causes a large voltage
swing across the laser. A compensation filter network
also can be used to reduce ringing, edge speed, and
voltage swing.
Programming Modulation Current
Resistors at the MODSET and TC pins set the ampli-
tude of the modulation current. The resistor R
MOD
sets
the temperature-stable portion of the modulation cur-
rent, and the resistor (R
TC)
sets the temperature-
increasing portion of the modulation current. To
determine the appropriate temperature coefficient from
the slope efficiency (
η
) of the laser, use the following
equation:
For example, if a laser has a slope efficiency
η
25
=
0.021mW/mA, which reduces to
η
70
= 0.018mW/mA.
Using the above equation will produce a laser tempco
of -3175ppm/
°
C.
To obtain the desired modulation current and tempco
for the device, the following equations can be used to
determine the required values of R
MOD
and R
TC
:
where tempco = -laser tempco, 0 < tempco <
4000ppm/
°
C, and 2mA < i
MOD
< 30mA.
Figure 8 shows a family of curves derived from these
equations. The straight diagonal lines depict constant
tempcos. The curved lines represent constant modula-
tion currents. If no temperature compensation is
desired, leave TC open, and the equation for i
MOD
-
simplifies considerably.
The following equations were used to derive Figure 8 and
the equations at the beginning of this section.
i
(
C
i
C
i
C
C
C Amps
°
MOD
70
MOD
MOD
70
(
25
(
25
(
25
°
)
=
°
)
+
°
)
×
°
i
T
R
R
R
T
C Amps
)
°
MOD
L
MOD
TC
( )
.
.
+
.
(
=
×
+
+
+
×
77
50
50
1 15
250
1 06
250
0 004
25
R
Tempco
i
R
Tempco
R
(
Tempco
TC
MOD
+
250
MOD
TC
=
×
=
)
×
0 22
10
6
250
10
52
0 19 48
.
10
250
6
6
.
/
/
/
LASER_
ppm
[
C
C
C
/
]
°
=
°
°
(
)
×
η
η
η
70
70
25
25
25
6
10
3.0V to 5.5V, 2.5Gbps VCSEL
and Laser Driver
10
______________________________________________________________________________________
R Q
S
FAULT LATCH
BIAS FAULT 1
BIAS FAULT 2
TC FAULT
MODSET FAULT
BIAS ENABLE
MODULATOR
ENABLE
DELAY
STARTUP
V
CC
PORDLY
SHDNDRV
FAULT
TX_DISABLE
V
BG
Figure 7. Safety Circuitry Functional Diagram
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX3996CGP-T 功能描述:激光驅(qū)動(dòng)器 3-5.5V 2.5Gbps VCSEL & 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
MAX3996CTP+ 功能描述:激光驅(qū)動(dòng)器 3-5.5V 2.5Gbps VCSEL & 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
MAX3996CTP+D 制造商:Maxim Integrated Products 功能描述:LASER DRVR VCSEL 2.5GBPS 1CH 20TQFN - Rail/Tube
MAX3996CTP+T 功能描述:激光驅(qū)動(dòng)器 3-5.5V 2.5Gbps VCSEL & 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
MAX3996CTP+TD 制造商:Maxim Integrated Products 功能描述:LASER DRVR VCSEL 2.5GBPS 1CH 20TQFN - Tape and Reel
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