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參數(shù)資料
| 型號(hào)： | FOA2322A |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | 3.2 Gbi t /s Laser Driver IC for Telecom and Datacom Applications |
| 中文描述： | 3.2陸基攔截噸/ s的電信和數(shù)據(jù)通信應(yīng)用激光驅(qū)動(dòng)器集成電路 |
| 文件頁數(shù)： | 24/37頁 |
| 文件大小： | 542K |
| 代理商： | FOA2322A |
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FOA2322A
Electrical Characteristics
Preliminary Data Sheet
20
2001-05
2.8
Laser and
V
CC
Supervising Circuit
If there is a laser fault (optical power deviates
±
1 dB) this signal is stored and indicated
by LF (logic high). The fault indication (LF) can be reset with low level at RSTN or with
high level at RST or with power down (
V
CC
<
V
CC
Reset Threshold) only. After power up,
LF will always be cleared. Disabling the laser by LEN does not influence a previous fault
indication by LF. The laser fault generation can be switched off by connecting CFDEL to
V
CC
. During RSTN is logic low or RST is logic high the circuit is in Reset state.
In case of changing RST = H or RSTN = L after laser fault recognition LF = H (after
t
FDEL
) there is an additional delay time implemented which has the same value as the
Power On Delay.
If the supply voltage is lower than the
V
CC
reset threshold the indicator Hardware Alarm
(HWA) is still at the low level and the circuit is in Reset state.
During Power On Delay the circuit is in Reset state too. The Power On Delay is defined
as the delay after
V
CC
voltage has risen above the
V
CC
reset threshold. This time can be
adjusted by an external capacitor at COSC (Mode 1). The Reset N-Output of the
MAX 809S Power Supervisor IC can be connected to RSTN to use the reset function of
the MAX 809S.
The laser control by RST and RSTN is fully redundant. This means only an AND
combination of RST = 0 / RSTN = 1 can switch the laser on. The OR combination of
RST = 1 / RSTN = 0 switches the laser off (see
Table 4
for clarification).
Table 4
shows the static states of these signals. Dynamic changes or delays due to
external delay capacitors are not shown.
Table 4
Laser Diode Currents Enable / Disable Signals
V
CC
< Reset
Threshold
V
CC
0
X
RST
LEN
RSTN
In Case of
Laser Fault
LDOFF Modulation
Enable
1)
1)
Internal signal
2)
After Power On Delay
3)
After
t
FDEL
4)
Sink current enabled = Low
Bias
Enable
1)
LF (high
active)
X
1
X
1
0
0
0
1
X
X
X
X
1
0
0
0
X
X
0
X
X
1
0
0
0
X
X
X
X
yes
no
2)
no
2)
1
1
3)
0
4)
0
0
0
1
3)
0
0
1
1
0
0
0
0
1
0
1
1
0
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