AK2572 Datasheet, PDF (31/50 Pages) Asahi Kasei Microsystems – APC for Burst Mode Applicable Direct Modulation Laser Diode

ASAHI KASEI
8.2 At Power-On (at TXDIS=”L”)
Start-up sequence at power-on（at TXDIS＝”L”） is shown in Figure 8-2.
Figure 8-2 Start-up Sequence at Power-on (at TXDIS=”L”)
[AK2572]
VDD
TXDIS
2ms [Typ.]
LD Current
TXFAULT with OPTALM enable
(When to set accelerated start-up sequence)
APC FF value or
APC FB initial value
APC FF value
Power On Reset
Initialization
APC Feedback
Normal operation
APC FB initial procedure
ALM operation
TXFAULT enable without OPTALM
TXFAULT with
(When not to set accelerated start-up sequence) OPTALM enable
t_init: 160ms [Typ.]
8.3 At Power-On (at TXDIS＝”H”)
Start-up sequence at power-on (at TXDIS＝“H”) is shown in Figure 8-3.
Figure 8-3 Start-up Sequence at Power-on (at TXDIS＝“H”)
VDD
TXDIS
LD Current
APC FF value or
APC FB initial value
APC FF value
Power On Reset
Initialization
2ms [Typ.]
TXFAULT with OPTALM enable
(When to set accelerated start-up sequence)
APC Feedback
Normal operation
APC FB initial procedure
ALM Operation
TXFAULT enable without OPTALM
(When not to set accelerated start-up sequence)
t_init: 160ms [typ]
TXFAULT with
OPTALM enable
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< MS0290-E-01>
2004/8