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參數(shù)資料
| 型號(hào)： | foa2251 |
| 廠商： | SIEMENS AG |
| 英文描述： | 2.5 Gb/s Laser Driver(2.5 Gb/s激光驅(qū)動(dòng)器) |
| 中文描述： | 2.5 Gb / s的激光驅(qū)動(dòng)器（2.5 Gb / s的激光驅(qū)動(dòng)器） |
| 文件頁(yè)數(shù)： | 11/16頁(yè) |
| 文件大小： | 231K |
| 代理商： | FOA2251 |
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Semiconductor Group
11
August 98
FOA2251A1
FOA2252A1
L
ASER AND
V
CC
S
UPERVISING
C
IRCUIT
If there is a fault signal (Laser Fault), this signal is stored and indicated by LF. The fault
indication (LF) can be reset with low level at RSTN or with power down
(V
CC
< V
CC
Reset Threshold) only. After power up, LF will always be cleared. Together
with resetting LF, the external capacitor at C
FDEL
is charged to reset the fault delay time
as well. This capacitor will also be charged whenever the laser is disabled by LE / LEN
to accomplish equal fault delay times after laser enable, but this does not influence a
previous fault indication by LF. The laser fault generation can be switched off by
connecting C
FDEL
to V
EE
.
The Power On Delay is the reset time after V
CC
voltage has risen above the V
CC
reset
threshold. This time can be adjusted by an external capacitor at C
PDEL
. If C
PDEL
is
shorted to V
CC
, there is no Power On Delay.
The laser control by LE and LEN is fully redundant. This means only an ’AND’
combination of LE = 1 / LEN = 0 can switch the laser on. The ’OR’ combination of
LE = 0 / LEN = 1 switches the laser off. To guarantee this on any single fault condition
too, LE and LEN paths are implemented completely separate and redundant (see table
1 for clarification).
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