AK2574VB AKM [Asahi Kasei Microsystems], AK2574VB Datasheet - Page 21

• Manufacturer Part Number: AK2574VB
• Description: 156M Laser Diode Driver + APC for Burst Mode
• Manufacturer: AKM [Asahi Kasei Microsystems]

“Shutdown” when TXDIS request from TXDIS pin or CLKALM detection. The polarity of TXDIS can be set by
RE_TXDIS_POL (0: “H” shutdown, 1: “L” shutdown).
Table 4-1 shows the shutdown condition and Table 4-2 shows AK2574 operation at shutdown. AK2574 goes into
Table 4-1 Shutdown Condition
Table 3-2 PDIN capacitance (CPDIN)
Table 3-3 TXACT Reference Voltage
3.2 CLKALM
CLKALM is detected when input CLK is 0’s or 1’s fixed more than 100ns (typ). The polarity of CLKALM can be set
by RE_CLKALM_POL (0: “H” at detection, 1: “L” at detection). AK2574 goes into “shutdown” (see 4. Shutdown)
when CLKALM is detected.
4. Shutdown
Note 1: 1 means shutdown request from TXDIS pin.
Note 2: 1 means CLKALM detection.
Table 4-2 AK2574 operation at shutdown
<MS0266-E-00>
PDIN Capacitance (CPDIN)
RE_DAC_TXACT
TXDIS (Note1)
Function
I-DAC1 / 2 output
APC_FF
MOD Driver
BIAS Driver
CLKALM
TXACT
011
010
000
100
101
110
111
001
1
0
0
Item
CLKALM (Note2)
High-Z (0mA output)
Normal Operation
DATA=0
OFF (BRST=0)
Normal Operation
Hold non-detected polarity
Operation
0.66
0.56
0.46
0.36
0.26
0.16
min
0.86
0.76
X
0
1
min
typ
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
txact_ref
typ
14
Normal Operation
max
0.94
0.84
0.74
0.64
0.54
0.44
0.34
0.24
Shutdown
Shutdown
Operation
max
26
-21-
unit
V
V
V
V
V
V
V
V
Unit
Shutdown by pin
Shutdown by CLKALM detection
pF
Remarks
Remark
Remarks
Remarks
2003/12