參數(shù)資料
型號(hào)： MAX3766EEP
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 其它接口
英文描述： 622Mbps LAN/WAN Laser Driver with Automatic Power Control and Safety Shutdown
中文描述： SPECIALTY INTERFACE CIRCUIT, PDSO20
封裝： 0.150 INCH, 0.025 INCH PITCH, MO-137AB, QSOP-20
文件頁(yè)數(shù)： 10/20頁(yè)
文件大小： 250K
代理商： MAX3766EEP
M
Latched Shutdown Configuration
This configuration is shown in the Typical Application
Circuits (configured for best performance), and can
be selected by connecting a capacitor (C
SAFETY
) to
ground at SAFETY. In this configuration, the transmitter
is shut down when a failure is detected. It can be
restarted only by a power-on cycle or a toggle of the
ENABLE input.
During start-up,
FAIL
is asserted until laser power reach-
es the programmed level. The safety circuit must be dis-
abled at power-on or at transmitter enable, providing
enough time for the APC circuit to reach the programmed
laser power level.
In space-constrained designs, C
SAFETY
can be select-
ed to provide a shutdown delay. When power is initially
applied, or when the ENABLE signal is toggled from a
logic 0 to a logic 1, the voltage at SAFETY is low, and
rises with a time constant set by C
SAFETY
and an inter-
nal 200k
pull-up resistor. The SAFETY signal is invert-
ed and resets the input of a reset-dominant RS flip-flop.
The internal signal FAILURE from the failure-detection
circuit is connected to the set input of the flip-flop. After
SAFETY has gone high (allowing time for the APC feed-
back loop to settle) and if internal signal FAILURE is low,
the flip-flop output is low, and the bias and modulation
outputs are allowed to remain on. Refer to Figure 5 for
a timing diagram of start-up in the latched shutdown
configuration.
The duration of t
SAFETY
must be about 10 times t
APC
for
a successful start-up. After start-up, the transmitter
operates normally until a failure is detected, causing
the output currents to be shut down. The laser-current
outputs remain off until the failure condition is eliminat-
ed and the ENABLE input is toggled, or until the power
is cycled. A potential problem with this transmitter-
enable method is that a slow-rising power supply may
not enable the transmitter.
622Mbps LAN/WAN Laser Driver with
Automatic Power Control and S afety S hutdown
10
______________________________________________________________________________________
S
RESET DOMINATE
RS FLIP-FLOP
OPEN
COLLECTOR
FAIL
Q
ENABLE
C
SAFETY
SAFETY
OPEN
COLLECTOR
100k
200k
V
CC
FAILURE
(INTERNAL)
SHDN
(INTERNAL)
SIMPLIFIED
OPEN-COLLECTOR
OUTPUT CIRCUIT
OUT
IN
R
Figure 4. Simplified Safety Circuit Schematic
V
CC
V
CC
ON (OR ENABLE SWITCHED TOON STATE)
LASER BIAS AND
MODULATION CURRENT
t
ON
t
APC
t
SAFETY
OUTPUT CURRENTS ENABLED AFTER A FIXED DELAY
FAIL DEASSERTS WHEN THE APC LOOP SETTLES
SAFETY FEATURES START CHECKING
THE FAILURE SIGNAL AFTER A TIME SET
BY A CAPACITOR ON THE SAFETY INPUT.
AFTER THIS TIME, THE LASER DRIVER IS
DISABLED IF A FAILURE OCCURS.
FAIL
OUTPUT
SAFETY
Figure 5. Start-Up Sequence Timing
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX3766EEP+ 功能描述:激光驅(qū)動(dòng)器 622Mbps LAN/WAN 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
MAX3766EEP+T 功能描述:激光驅(qū)動(dòng)器 622Mbps LAN/WAN 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
MAX3766EEP-T 功能描述:激光驅(qū)動(dòng)器 622Mbps LAN/WAN 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
MAX3766EVKIT 功能描述:激光驅(qū)動(dòng)器 Evaluation Kit for the MAX3766 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
MAX3768C/D 功能描述:限幅放大器 RoHS:否 制造商:Micrel 輸入電壓范圍（最大值）:3.6 V 工作電源電壓:3.3 V 電源電流:40 mA 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:MSOP-10 封裝:Tube
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