參數(shù)資料
型號(hào)： AK2574
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： 156M Laser Diode Driver + APC for Burst Mode
中文描述： 1.56激光二極管驅(qū)動(dòng)器apc的突發(fā)模式
文件頁(yè)數(shù)： 20/30頁(yè)
文件大小： 248K
代理商： AK2574
ASAHI KASEI
[AK2574]
<MS0266-E-00>
-20-
2003/12
3. Alarm
AK2574 has 2 alarm functions as shown in Table 3-1.
Table 3-1 Alarm function
ALM
TXACT
Detection condition
When the PDIN votage (monitor PD current) is
beyond the reference votage (txact_ref). TXACT is
kept once TXACT detection until BRST=”L”.
When the detected 0s or 1s sequential CLK input
(100ns typical). When detected CLKALM,
AK2574 goes into“Shutdwon”.
Release condition
BRST=”L”
Detected Time
Depens on the condition.
See “3.1 TXACT” for more
information
100ns (typ)
200ns (max)
CLKALM
Poarity of CLK is
changed
3.1 TXACT
Fig 3-1illustrates TXACT block diagram. TXACT is detected when the PDIN votage is beyond the reference votage
(txact_ref), and TXACT is held during BRST = “H”. The txact_ref is set with RE_DAC_TXACT. TXACT detection
time depends on the Monitor PD current (i_pd) and capacitance (CMPD), external resistor (RPD), AK2574 PDIN
capactance (CPDIN) and txact_ref votage (see Fig 3-2 for the reference).
Table 3-2 shows the PDIN capacitance (CPDIN) and Table 3-3 shouws the relationship between txact_ref and
RE_DAC_TXACT. The polarity of TXACT can be set by RE_TXACT_POL (0: “H” at detection, 1: “L” at detection).
The TXACT detection time (t_act) is estimated under the 50% mark data input and average monitor current as
follows:
)
2
/
_
*
_
1
*
)
(
*
_
pd
i
RPD
ref
txact
LN
CPDIN
CMPD
RPD
act
t
+
=
Note: TXACT detection time varies with input data pattern.
Fig 3-1 TXACT block diagram
Monitor
PD
RPD
TXACT
DAC
(TXACT)
AND
PDIN
comp_out
i_pd
txact_ref
SET/
RESET
COMP
CPDIN
BRST
Fig 3-2 Reference figures for TXACT detection time
RPD
vpd
comp_out
i_pd
txact_ref
COMP
CMPD
CPDIN
i_pd @ DATA=1
0 @ DATA=0
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