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參數(shù)資料
| 型號(hào)： | MAX3740 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Full-Duplex LVDM Transceiver 8-MSOP -40 to 85 |
| 中文描述： | 3.2Gbps速率SFP VCSEL驅(qū)動(dòng)器與診斷監(jiān)視器 |
| 文件頁數(shù)： | 9/14頁 |
| 文件大?。?/td> | 818K |
| 代理商： | MAX3740 |
Detailed Description
The MAX3740 contains a bias generator with automatic
power control (APC), safety circuit, and a laser modula-
tor with optional peaking compensation.
Bias Generator
Figure 1 shows the bias generator circuitry that contains
a power-control amplifier and smooth-start circuitry. An
internal PNP transistor provides DC laser current to bias
the laser in a light-emitting state. The APC circuitry
adjusts the laser-bias current to maintain 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 cathode of a monitor
diode, which is used to sense laser power. The BIAS
output is connected to the anode of the laser through an
inductor or ferrite bead. The power-control amplifier dri-
ves a current amplifier to control the laser
’
s bias current.
During a fault condition, the bias current is disabled.
The PWRMON output provides a voltage proportional to
average laser power given by:
V
PWRMON
= 2
I
PD
R
PWRSET
The BIASMON output provides a current proportional to
the laser bias current given by:
I
BIASMON
= I
BIAS
/ 9
When APC is not used (no monitor diode, open-loop
configuration) connect the COMP and PWRMON pins
to GND. In this mode, the bias current is set by the
resistor R
BIASSET
. When a closed-loop configuration is
used, connect a 1.7k
resistor between ground and
BIASSET to set the maximum bias current.
Safety Circuit
The safety circuit contains an input disable
(TX_DISABLE), a latched fault output (FAULT), and fault
detectors (Figure 2). This circuit monitors the operation
of the laser driver and forces a shutdown (disables
laser) if a fault is detected (Table 1). Table 2 contains
the circuit
’
s response to various single-point failures.
The transmit fault condition is latched until reset by a
toggle of TX_DISABLE or V
CC
. The FAULT pin should
be pulled high with a 4.7k
to 10k
resistor.
Table 1. Fault Conditions
M
3.2Gbps SFP VCSEL Driver with Diagnostic
Monitors
_______________________________________________________________________________________
9
C
COMP
COMP
BIASSET
R
PWRSET
MD
1.8V
REF
CURRENT
AMPLIFIER
POWER-
CONTROL
AMPLIFIER
ENABLE
200
R
BIASSET
PWRMON
BIAS GENERATOR
SMOOTH-
START
R
BIASMON
BIASMON
FERRITE
BEAD
BIAS
1.6V
(2V
BE
)
2X
I
BIAS
40
I
PD
I
BIAS
9
MAX3740
0.8V
Figure 1. Bias Generator
PIN
FAULT CONDITION
BIAS
BIASMON
PWRMON
V
BIAS
> V
CC
- 0.2V
V
BIASMON
> 0.8V
V
PWRMON
> 0.8V
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| MAX3746ETE | Dual Multiplexed LVDM Repeater 16-SOIC -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+ | 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 |
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