參數(shù)資料
型號(hào)： AK2572
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： APC for Burst Mode Applicable Direct Modulation Laser Diode
中文描述： apc的突發(fā)模式適用的直接調(diào)制激光器
文件頁(yè)數(shù)： 27/50頁(yè)
文件大?。?/td> 463K
代理商： AK2572
ASAHI KASEI
[AK2572]
-27-
< MS0290-E-01>
2004/8
6.
Alarm Function
In Table 6-1, the outline of the AK2572 Alarm (ALM) functions such as TEMPALM, OPTALM, CURRALM,
EXTALM1 and EXTALM2, and TXFAULT output function where alarms to be selected by EEPROM/Register
setting are logically OR-ed, are listed.
Table 6-1 ALM Function Outlines
ALM
Condition to output alarm
Detect time
[Typ.]
Note
TEMPALM When detected temperature equivalent value
exceeds ALM set value (E_TEMPALM)
When monitor PD input voltage becomes lower
than ALM set value (RE_OPTALM)
CURRALM When a current to be set to DAC exceeds ALM set
value (RE_CURRALM_BIAS / MOD)
EXTALM1
EXTALM2
EXTALM1/2-pin as set by RE_EXTALM1/2_POL
When any of the ALMs is detected as target alarms
available on TXFAULT-pin output which are set by
EEPROM / Register setting (Refer to note above in
this table)
[*] The detect time does not include the delay time caused by a time constant of external Rpd and Cpd.
64 ms
Temp. sense period=64ms
Set by RE_TEMPALM_SET
Holding APC FB value
Set by RE_OPTALM_SET
OPTALM
5
μ
s [*]
125
μ
s
Set by RE_CURRALM_SET
When same polarity ALM signal is input on
1
μ
s
Set by RE_EXTALM1_SET
Set by RE_EXTALM2_SET
Automatically
when any target alarm is
detected and RE_SFP_SET
＝
”0”
TXFAULT
Depend on
the detected
target alarm
shutdown
6.1
TEMPALM
TEMPALM is generated when the following relation is established after digitally comparing the A-to-D
converted temperature sensor output value (R_TEMP [7:0]) with the ALM set value (R_TEMPALM) :
R_TEMP
≧
E_TEMPALM
6.2
OPTALM
1/3, 1/4, 1/6 or 1/7 value of the APC target value (apc_ref) can be set as OPTALM set value (optalm_ref) by
RE_OPTALM setting. OPTALM detect is done by an analog comparator and it is generated when the following
relation is established
vpd
＜
optalm_ref
6.3
CURRALM
CURRALM is generated when one of the following 3 conditions is met after digitally comparing DAC setting
value for Modulation current (R_DAC1 [I-DAC1 set value] or R_DAC3 [V-DAC3 set value]) or DAC setting value
for Bias current (R_DAC2 [I-DAC2 set value]) with the CURRALM setting value (R_CURRALM_BIAS,
R_CURRALM_MOD):
R_DAC2 (Upper 4 bits)
＞
R_CURRALM_BIAS
or
R_DAC1(Upper 4 bits)
＞
R_CURRALM_MOD, or R_DAC3(Upper 4 bits)
＞
R_CURRALM_MOD
Alarm threshold values R_CURRALM_BIAS and R_CURRALM_MOD can be set in accordance with the LD
temperature characteristic (Set by approximately every 6
℃
step with the data in E_CURRALM_BIAS_TC,
E_CURRALM_MOD_TC, Refer to Table 9-3).
CURRALM is also generated when either of R_DAC1 (R_DAC3) or R_DAC2 becomes its full code (FFh).
When a shutdown request is made, CURRALM is set to “Inactive“ polarity.
6.4
EXTALM1, EXTALM2
When the same polarity ALM signal is input on EXTALM1-pin as set by RE_EXTALM1_POL, EXTALM1
detection is made. On the other hand, when the same polarity ALM signal is input on EXTALM2 /
MOD_CTRL-pin as set by RE_EXTALM2_POL, EXTALM2 detection is made if RE_PWR_LVL1_SET
＝
”0” or
RE_SFP_SET
＝
”0” (EXTALM2 / MOD_CTRL -pin is set to EXTALM2-pin)
When RE_EXTALM1/2_POL
＝
"0", the ALM detect polarity of “H” at EXTALM1/2-pin is set.
When RE_EXTALM1/2_POL
＝
"1", the ALM detect polarity of “L” at EXTALM1/2-pin is set.
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