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參數(shù)資料
| 型號： | 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)動器與診斷監(jiān)視器 |
| 文件頁數(shù)： | 10/14頁 |
| 文件大小： | 818K |
| 代理商： | MAX3740 |
M
3.2Gbps SFP VCSEL Driver with Diagnostic
Monitors
10
______________________________________________________________________________________
PIN NAME
FAULT
TX_DISABLE
IN+
IN-
SQUELCH
TC1
CIRCUIT RESPONSE TO V
CC
SHORT
Does not affect laser power.
Modulation and bias current are disabled.
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
CIRCUIT RESPONSE TO GND SHORT
Does not affect laser power.
Normal condition for circuit operation.
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
Does not affect laser power.
TC2
The laser modulation is increased, but average power
is not affected.
Modulation current is disabled.
MODSET
Modulation current is disabled.
The laser modulation is increased, but average power
is not affected.
PEAKSET
OUT+
OUT-
BIASSET
Does not affect laser power.
Modulation current is disabled.
Does not affect laser power.
Laser bias is disabled.
Does not affect laser power.
Modulation current is disabled.
Does not affect laser power.
Fault state* occurs.
BIAS
Fault state* occurs. Note that VCSEL emissions may
continue; care must be taken to prevent this condition.
Disables VCSEL.
BIASMON
Fault state* occurs.
Does not affect laser power.
COMP
The bias current is reduced, and the average power of
the laser output is reduced.
I
BIAS
increases to the value determined by R
BIASSET
; if
the bias monitor fault threshold is exceeded, a fault is
signaled.
MD
I
BIAS
increases to the value determined by R
BIASSET
; if
the bias-monitor fault threshold is exceeded, a fault is
signaled.
The bias current is reduced, and the average power of
the laser output is reduced.
REF
I
BIAS
increases to the value determined by R
BIASSET
; if
the bias-monitor fault threshold is exceeded, a fault is
signaled.
The bias current is reduced, and the average power of
the laser output is reduced.
PWRMON
Fault state* occurs.
Does not affect laser power.
Table 2. Circuit Response to Various Single-Point Faults (Closed-Loop APC Configuration)
*
A fault state asserts the FAULT pin, disables the modulator output, and disables the bias output.
Modulation Circuit
The modulation circuitry consists of an input buffer, a
current mirror, and a high-speed current switch (Figure
3). The modulator drives up to 15mA of modulation into
a 50
VCSEL load.
The amplitude of the modulation current is set with
resistors at MODSET and temperature coefficient (TC1,
TC2) pins. The resistor at MODSET (R
MODSET
) pro-
grams the temperature-stable portion of the modulation
current, and the resistor between TC1 and TC2 (R
TC
)
programs the temperature coefficient of the modulation
current. For appropriate R
TC
and R
MODSET
values, see
the
Typical Operating Characteristics
section.
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. Use a high-efficiency laser that
requires low modulation current and generates a low-
voltage swing. Trim the leads to reduce laser package
inductance. The typical package leads have induc-
tance of 25nH per inch (1nH/mm). This inductance
causes a large voltage swing across the laser. A com-
pensation filter network can also be used to reduce
ringing, edge speed, and voltage swing (see the
Designing the Compensation Filter Network
section).
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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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