AK2572 Datasheet, PDF (41/50 Pages) Asahi Kasei Microsystems – APC for Burst Mode Applicable Direct Modulation Laser Diode

ASAHI KASEI
[AK2572]
Table 9-6 Register Configuration (Continued)
Register
Address
Function
Bit Form R/W
Note
R_APC_FF_SET [7:6] 02h
APC FF setting
2 U R/W Refer to Table 4-6
R_APC_FB_SET [5:4] 02h
R_APC_INIT_SET [3] 02h
APC FB setting
2 U R/W
APC_FB initial value setting 1 U R/W
Refer to Table 4-6
0: OFF, 1: ON
R_DAC3_GAIN [2] 02h
V-DAC3 gain setting
1 U R/W
0:Gain＝1
1:Gain＝1.2/2.2
R_DAC2_GAIN [1] 02h
I-DAC2 gain setting
1 U R/W 0:Gain＝1/2, 1: Gain＝1
R_DAC1_GAIN [0] 02h
I-DAC1 gain setting
1 U R/W 0:Gain＝1/10, 1: Gain＝1
R_TIMER
_OPTALM [6]
03h
OPTALM mask time setting
for SFP_TXFAULT detection
1
U
R/W
0:160ms, 1:2ms [Typ.]
(Refer to Table 8-1)
R_EXTALM2_POL [5] 03h EXTALM2 polarity setting 1 U R/W 0:“H” active, 1:“L” active
R_EXTALM1_POL [4] 03h EXTALM1 polarity setting 1 U R/W 0:“H” active, 1:“L” active
R_TEMP_DET [3]
03h
Temperature difference
detection at Shutdown release
1
U
R/W
0:OFF, 1:ON
Refer to Section 7.2
R_DAC_SET [2:0]
03h
DAC operation setting
3 U R/W
0:OFF, 1:ON
[2] : V-DAC3,
[1] : I-DAC2
[0] : I-DAC1
R_OPTALM [7:6]
04h
OPTALM threshold
2 U R/W 0:1/3, 1:1/4, 2:1/6, 3:1/7
R_PDGAIN [5:0]
04h
PD gain setting
6 U R/W Refer to Table 4-3
R_EXTALM2_SET [5] 05h
R_EXTALM1_SET [4] 05h
EXTALM2 setting for
TXFAULT
EXTALM1 setting for
TXFAULT
1 U R/W 0:OFF, 1:ON (Target)
1 U R/W 0:OFF, 1: ON (Target)
R_CURRALM_SET [3] 05h
CURRALM setting for
TXFAULT
1 U R/W 0:OFF, 1: ON (Target)
R_OPTALM_SET [2] 05h OPTALM setting for TXFAULT 1 U R/W 0:OFF, 1: ON (Target)
R_TIMER
_EXTALM2 [1]
05h
EXTALM2 mask time setting
for SFP_TXFAULT detection
1
U
R/W
0:0ms , 1:2ms [Typ.]
（Refer to Table 8-2）
R_TIMER
_EXTALM1 [0]
05h
EXTALM1 mask time setting
for SFP_TXFAULT detection
1
U
R/W
0:0ms , 1:2ms [Typ.]
（Refer to Table 8-2）
R_TEMPALM_SET [7] 06h Set TEMPALM for TXFAULT 1 U R/W 0:OFF, 1: ON (Target)
R_TEMP_WIN [7:0] 07h
Window setting for
Temperature difference
detection
8
U
R/W
Refer to Section 7.2 and
Table 4-10
R _MODV_SEL [7]
08h
DAC setting for Imod (Data
setting for I-DAC1, V-DAC3)
1
U
R/W
Refer to Table 3-4
R_MOD_FBRT [6:0]
08h
APC_FB dividing value for
Imod
7 U R/W Refer to Section 4.2.4
R_BIAS_FBRT [6:0]
09h
APC_FB dividing value for
Ibias
7 U R/W Refer to Section 4.2.4
R_APC_FBIV [7:0] 0Ah
APC FB initial value
8 U R/W Refer to Table 4-10 [*2]
R_APC_TRGT [4:0] 0Bh
R_MOD_FF [7:0]
0Ch
APC target setting
APC_FF value for Imod
5 U R/W Refer to Table 4-4
8 U R/W I-DAC1 or V-DAC3
R_BIAS_FF [7:0]
0Dh
APC_FF value for Ibias
8 U R/W
I-DAC2
R_EXTRA [7:0]
0Eh
R_CURRALM
_BIAS [7:4]
0Fh
R_CURRALM
_MOD [3:0]
0Fh
EXTRA DAC value
8
CURRALM setting for Ibias 4
CURRALM setting for Imod 4
U R/W
U R/W
U R/W
V-DAC3 or I-DAC1
(DAC isn’t for Imod)
Refer to Section 6.3
Refer to Section 6.3
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< MS0290-E-01>
2004/8