ak2573a AKM Semiconductor, Inc., ak2573a Datasheet - Page 18

• Manufacturer Part Number: ak2573a
• Description: 125m / 156m Laser Diode Driver Apc - Asahi Kasei Microsystems
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
Fig 4-7 APC example-4 (MOD=FF+FB, BIAS=FF)
Fig 4-9 APC example-6 (MOD=FF+FB, BIAS=FB)
Table 4-5 EEPROM Assignments for typical operation
E_DAC1_FF_TC: I-DA C1 current data (temperature compensated)
E_DAC2_FF_TC: I-DA C2 current data (temperature compensated)
E_A PC_INIT_TC: R_A PC_FB initial data (temperature compensated)
Table 4-6 APC FB Operation
<MS0189-E-01>
R_DAC1_FB = R_APC_FB
R_DAC1 = R_DAC1_FF + R_DAC1_FB
R_DAC2 = R_DAC2_FF
R_DAC1_FB = K_DAC1_FBRT * R_APC_FB
R_DAC1 = R_DAC1_FF + R_DAC1_FB
R_DAC2 = R_DAC2_FB = R_APC_FB
R_APC_FB
R_APC_FB
RE_APC_
FB_SET
RE_APC_
FF_SET
00
01
10
11
01
10
11
11
11
01
01
10
10
00
11
(E_DAC_FBRT_FIX)
R_DAC1_FBRT
K_DAC1_
FBRT
1
0
1
RE_APC_
FF_SET
X X
X X
X X
00
01
10
11
R_DAC2_FB
= R_APC_FB
RE_APC_
FB_SET
R_DAC1_FB
R_DAC2_FB
R_APC_FB
R_DAC1_FB
= 0
=
10
01
00
01
10
11
11
11
11
11
11
R_DAC1_FF
R_DAC1_FF
R_DAC2_FF
R_DA C1_FBRT*1.25/64/G_DAC1
R_DAC2_FF = 0
+
+
+
+
R_DAC1
R_DAC2
R_DAC1
R_DAC2
RE_APC_
INIT_SET
K_DA C1_FBRT
I-DAC1
I-DAC2
I-DAC1
I-DAC2
85/255
54/255
85/255
54/255
0
1
0
1
x
x
x
0
1
0
1
x
x
0
1
0
1
-
-
G_DAC1/G_DAC2 = 1 or 0.5
G_DAC1/G_DAC2 = 1 or 0.5
RE_DAC1_GAIN
RE_DAC2_GAIN
RE_DAC1_GAIN
RE_DAC2_GAIN
G_DAC1
G_DAC2
G_DAC1
G_DAC2
E_DAC2_TC
E_A PC_INIT_TC
E_A PC_INIT_TC
E_DAC2_FF_TC
E_DAC2_FF_TC
E_DAC2_FF_TC
E_DAC2_FF_TC
E_DAC2_FF_TC
E_DAC2_FF_TC
E_DAC2_FF_TC
Imod
Ibias
Imod
Ibias
-
-
R_DA C2_FBRT/32/G_DAC2 R_DA C2_FBRT=E_DA C_FBRT
Fig 4-8 APC example-5 (MOD=FF, BIAS=FF+FB)
Fig 4-10 APC example-7 (MOD=FB, BIAS=FF+FB)
R_DAC2_FB = K_DAC2_FBRT * R_APC_FB
R_DAC1 = R_DAC1_FB = R_APC_FB
R_DAC2 = R_DAC2_FF + R_DAC2_FB
R_DAC2_FB = R_APC_FB
R_DAC1 = R_DAC1_FF
R_DAC2 = R_DAC2_FF + R_DAC2_FB
R_APC_FB
-18-
R_APC_FB
K_DA C2_FBRT
E_DAC1_TC
0
0
1
1
E_A PC_INIT_TC
E_A PC_INIT_TC
-
-
E_DAC1_FF_TC
E_DAC1_FF_TC
E_DAC1_FF_TC
E_DAC1_FF_TC
E_DAC1_FF_TC
E_DAC1_FF_TC
E_DAC1_FF_TC
K_DAC2_
FBRT
0
1
1
(E_DAC_FBRT_FIX)
R_DAC2_FBRT
Prohibit
R_DAC1_FB
= R_APC_FB
R_DAC2_FB
R_DAC2_FB
-
-
R_DAC1_FB
R_APC_FB
= 0
=
R_DAC1_FF =
R_DAC2_FF
R_DAC1_FF
No FB
FB for MOD
FB for BIAS
Prohibit
R_DA C1_FBRT=E_DA C_FBRT
Prohibit
+
+
+
+
0
R_DAC2_FF
R_DAC1
R_DAC2
R_DAC1
R_DAC2
I-DA C2
(BIAS)
FF+FB
FF+FB
FF+FB
FB
FB
FF
FF
FF
FF
FB
FB
Remark
I-DAC1
I-DAC2
I-DAC1
I-DAC2
85/255
54/255
85/255
54/255
G_DAC1/G_DAC2 = 1 or 0.5
G_DAC1/G_DAC2 = 1 or 0.5
RE_DAC1_GAIN
RE_DAC2_GAIN
RE_DAC1_GAIN
RE_DAC2_GAIN
I-DAC1
(MOD)
[AK2573A]
G_DAC1
G_DAC2
G_DAC1
G_DAC2
FF+FB
FF+FB
FF+FB
FB
FB
FB
FB
FF
FF
FF
FF
2004/5
Imod
Ibias
Imod
Ibias