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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)： | 8/16頁(yè) |
| 文件大?。?/td> | 231K |
| 代理商： | FOA2251 |
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Semiconductor Group
8
August 98
FOA2251A1
FOA2252A1
Notes:
1. The bias -, modulation-, the LF- and S
BIAS
output currents are not included.
2. This describes the AC modulation current (the DC component is the overall offset current). AC
modulation current is drawn by O at V
D
> V
DN
, it is drawn by ON at V
D
< V
DN
. I
modhigh
refers to drawn
modulation current (AC + DC). I
modlow
refers to an inactive current output (DC current only).
3. Inactive current output (see also note 2).
4. Modulation current when the laser diode is disabled.
5. Adjustment of programmable parameter by resistor value within this range.
6. Modulation current adaptation within junction temperature range. Low junction temperature represents
a low additional modulation current. High junction temperature represents a high additional modulation
current.
7. D/DN inputs are internally terminated to V
BB
by resistor R
IN
. See data input stage description.
8. If data input duty cycle falls below 5 % or exceeds 95 % the laser will be disabled after
tISMDEL
. On the
other hand, the laser will be enabled within t
ISMDEL
whenever the data input duty cycle goes back to
25 % ... 75 %. Data input duty cycle refers to the quotient given by number of ones divided by number
of zeros within serial data stream. t
ISMDEL
will be adjusted by external capacitor at C
ISM
.
9. A capacitor within this range programs the time.
10. S
BIAS
is an open collector output for pulling up a resistor R
SBIAS
to monitor the bias current.
11. The supervisor circuit will detect a failure condition if MD voltage exceeds V
MDnom
±
2dB range.
V
is given by nominal voltage level at MD which is set by V
.
12. The supervisor circuit will detect no failure condition if MD input voltage ranges from V
MDnom
-1.2dB to V
+ 1.2dB. V
is given by nominal voltage level at MD which is set by V
.
13. A failure condition will be reported by LF if this condition lasts for t
FDEL
. This time can be adjusted by
external capacitor at C
.
14. Time between LF high (or LE low) and LD
OFF
high.
15. At supply voltages below V
CC
threshold the laser diode bias and modulation current will be held
disabled and LD
OFF
will be held high. Above the laser diode will be enabled after the Power On Delay.
16. The Power On Delay is the reset time after V
CC
voltage has risen above the V
CC
reset threshold.
During the Power On Delay the laser diode bias and modulation current will be held disabled and
LDOFF will be held high. This time can be adjusted by external capacitor at C
PDEL
.
17. Temperature and voltage drift are included.
18. Minimal capacitor on C
FDEL
has to be chosen that the failure recognition time is longer than the settling
time of the bias controller.
19. Adjusting the modulation current by R
notice that the increasing of R
will increase the
modulation current. R
MOD
has to be adjusted that the modulation current is smaller than 60mA.
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