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參數(shù)資料
| 型號： | MAX3996 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 3.0V to 5.5V, 2.5Gbps VCSEL and Laser Driver |
| 中文描述： | +3.0V至+5.5V、2.5Gbps VCSEL及激光驅(qū)動器 |
| 文件頁數(shù)： | 7/17頁 |
| 文件大?。?/td> | 785K |
| 代理商： | MAX3996 |
Detailed Description
The MAX3996 contains a bias generator with automatic
power control and smooth start, a laser modulator, a
power-on reset (POR) circuit, and safety circuitry
(Figure 3).
Bias Generator
Figure 4 shows the bias generator circuitry that con-
tains a power-control amplifier, smooth-start circuitry,
and two bias-fault sensors. The power-control amplifier
combined with an internal NPN transistor provides DC
laser current to bias the laser in a light-emitting state.
The APC circuitry adjusts the laser bias current to main-
tain average power over temperature and changing
laser properties. The smooth-start circuitry prevents
current spikes to the laser during power-up or enable,
ensuring compliance with safety requirements and
extending the life of the laser.
The MD input is connected to the anode of a monitor
diode, which is used to sense laser power. The BIAS
output is connected to the cathode of the laser through
an inductor or ferrite bead. The power-control amplifier
drives a transistor to control the laser
’
s bias current. In
a fault condition (Table 1), the base of the bias-driving
transistor is pulled low to ensure that bias current is
turned off.
M
3.0V to 5.5V, 2.5Gbps VCSEL
and Laser Driver
_______________________________________________________________________________________
7
MAX3996
MODULATION CURRENT
GENERATOR
V
CC
3.0V TO 5.5V
I
CC
IN+
IN-
0.01
μ
F
0.01
μ
F
V
ID
R
IN
R
OUT
R
OUT
V
CC
OUT-
OUT+
0.01
μ
F
25
0.01
μ
F
25
i
MOD
i
OUT
FERRITE
BEAD*
R
MOD
MODSET
TC
*MURATA
BLM11HA102SG
Figure 1. Output Load for AC Specification
i
MOD
CURRENT
V
ID
= V
IN+
- V
IN-
V
IN-
V
IN+
VOLTS
TIME
100mV
P-P
MIN
1100mV
P-P
MAX
200mV
P-P
MIN
2200mV
P-P
MAX
SINGLE-ENDED SIGNAL
DIFFERENTIAL SIGNAL
Figure 2. Required Input Signal and Modulation-Current Polarity
MAX3996
SAFETY
CIRCUITRY
BIAS
GENERATOR
WITH SMOOTH
START
MODULATION CURRENT
GENERATOR
MODULATION
ENABLE
MODULATION
FAULT
100
IN+
IN-
INPUT BUFFER
LASER
MODULATION
50
50
V
CC
OUT-
OUT+
TC
MODSET
POR CIRCUIT
BIAS ENABLE
BIAS
MD
COMP
MON1
MON2
PORDLY
TX_DISABLE
V
CC
FAULT
SHDNDRV
Figure 3. Laser Driver Functional Diagram
MAX3996
R
MON
(11
)
400mV
400mV
BIAS
DISABLE
1.1V
SMOOTH START
POWER-CONTROL
AMPLIFIER
BIAS
FAULT 1
BIAS
FAULT 2
MD
BIAS
MON2
MON1
COMP
Figure 4. Bias Circuitry
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3996CGP | 功能描述:激光驅(qū)動器 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 |
| MAX3996CGP-T | 功能描述:激光驅(qū)動器 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 |
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