參數(shù)資料
型號(hào)： AK2573A
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： 125M / 156M Laser Diode Driver + APC
中文描述： 1.25億/ 1.56 apc的激光二極管驅(qū)動(dòng)器
文件頁(yè)數(shù)： 17/38頁(yè)
文件大?。?/td> 286K
代理商： AK2573A
ASAHI KASEI
[AK2573A]
<MS0189-E-01>
-17-
2004/5
Table 4-4 Example of APC FF and APC FB combination
RE_APC_
FF_SET
FB_SET
(I-DAC2)
01
10
RE_APC_
BIAS
MOD
(I-DAC1)
FF
Remarks
Reference
FB
The initial value of APC FB according to the
temperature can be set to accelerate power up time.
The initial value of APC FB according to the
temperature can be set to accelerate power up time.
Both BIAS and MOD current are detrmined by
APC_FF. APC_FB is not work.
Both BIAS and MOD current are detrmined by
APC_FF. APC_FB is set to MOD for LD aging.
Both BIAS and MOD current are detrmined by
APC_FF. APC_FB is set to BIAS for LD aging.
Dual Feedback function.
BIAS current is determined by APC_FB. MOD
current is determined by APC_FF and APC_FB.
The initial value of APC_FB according tothe
temperature can be set to accelerate power up time.
Dual Feedback function.
MOD current is determined by APC_FB. BIAS
current is determined by APC_FF and APC_FB.
The initial value of APC_FB according tothe
temperature can be set to accelerate power up time.
Prohibit
Prohibit
Fig 4-4
10
01
FF
FB
Fig 4-5
11
00
FF
FF
Fig 4-6
11
01
FF
FF+FB
Fig 4-7
11
10
FF+FB
FF
Fig 4-8
01
11
FB
FF+FB
Fig 4-9
10
11
FF+FB
FB
Fig 4-10
00
11
11
11
-
-
-
-
RE_APC_FF_SET (Register or EEPROM) is composed of 2-bits. MSB shows BIAS (I-DAC2) and LSB shows MOD
(I-DAC1), and “1” indicates APC Feed-forward function is selected.
RE_APC_FB_SET (Register or EEPROM) is composed of 2-bits. MSB shows BIAS (I-DAC2) and LSB shows MOD
(I-DAC2), and “1” indicates APC Feedback function is selected.
Fig 4-4 APC example-1 (MOD=FF, BIAS=FB) Fig 4-5 APC example-2 (MOD=FB, BIAS=FF)
Ibias
R_APC_FB
54/255
G_DAC1
G_DAC2
85/255
1
Imod
R_DAC1
R_DAC2_FB
= R_APC_FB
RE_DAC1_GAIN
RE_DAC2_GAIN
G_DAC1/G_DAC2 = 1 or 0.5
I-DAC1
I-DAC2
+
R_DAC2
+
R_DAC2_FF = 0
R_DAC1_FF
0
R_DAC1_FB
= 0
R_DAC1 = R_DAC1_FF
R_DAC2 = R_DAC2_FB = R_APC_FB
Ibias
R_APC_FB
54/255
G_DAC1
G_DAC2
85/255
0
Imod
R_DAC1
R_DAC1_FB
= R_APC_FB
RE_DAC1_GAIN
RE_DAC2_GAIN
G_DAC1/G_DAC2 = 1 or 0.5
I-DAC1
I-DAC2
+
R_DAC2
+
R_DAC2_FF
R_DA0
1
R_DAC2_FB
= 0
R_DAC1 = R_DAC1_FB = R_APC_FB
R_DAC2 = R_DAC2_FF
Fig 4-6 APC example-3 (MOD=FF, BIAS=FF)
Ibias
R_APC_FB
54/255
G_DAC1
G_DAC2
85/255
Imod
R_DAC1
R_DAC2_FB
=0
RE_DAC1_GAIN
RE_DAC2_GAIN
G_DAC1/G_DAC2 = 1 or 0.5
I-DAC1
I-DAC2
+
R_DAC2
+
R_DAC2_FF
R_DAC1_FF
0
R_DAC1_FB
= 0
R_DAC1 = R_DAC1_FF
R_DAC2 = R_DAC2_FF
0
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