ASAHI KASEI
[AK2573A]
Fig 4-7 APC example-4 (MOD=FF+FB, BIAS=FF)
Fig 4-8 APC example-5 (MOD=FF, BIAS=FF+FB)
R_DAC1_FF
RE_DAC1_GAIN
R_DAC1_FF
RE_DAC1_GAIN
I-DAC1
I-DAC1
R_DAC1_FB
R_DAC1_FB
= 0
=
R_APC_FB
R_DAC1
Imod
Ibias
R_APC_FB
R_DAC1
Imod
Ibias
R_APC_FB
1
0
+
+
85/255
G_DAC1
0
1
+
+
85/255
G_DAC1
I-DAC2
I-DAC2
R_DAC2_FB
= 0
R_DAC2_FB
= R_APC_FB
R_DAC2
R_DAC2
54/255
G_DAC2
54/255
G_DAC2
R_DAC1_FB = R_APC_FB
R_DAC2_FF
RE_DAC2_GAIN
R_DAC2_FB = R_APC_FB
R_DAC2_FF
RE_DAC2_GAIN
R_DAC1 = R_DAC1_FF + R_DAC1_FB
R_DAC2 = R_DAC2_FF
G_DAC1/G_DAC2 = 1 or 0.5
R_DAC1 = R_DAC1_FF
G_DAC1/G_DAC2 = 1 or 0.5
R_DAC2 = R_DAC2_FF + R_DAC2_FB
Fig 4-9 APC example-6 (MOD=FF+FB, BIAS=FB)
Fig 4-10 APC example-7 (MOD=FB, BIAS=FF+FB)
R_DAC1_FBRT
(E_DAC_FBRT_FIX)
R_DAC1_FF =
RE_DAC1_GAIN
0
R_DAC1_FF
RE_DAC1_GAIN
I-DAC1
85/255
I-DAC1
R_DAC1_FB
=
R_APC_FB
R_DAC1_FB
R_DAC1
Imod
Ibias
R_APC_FB
R_DAC1
Imod
K_DAC1_
FBRT
R_APC_FB
+
+
G_DAC1
1
+
+
85/255
G_DAC1
R_DAC2_FBRT
(E_DAC_FBRT_FIX)
I-DAC2
54/255
I-DAC2
54/255
R_DAC2_FB
= R_APC_FB
R_DAC2
R_DAC2_FB
R_DAC2
Ibias
K_DAC2_
FBRT
1
G_DAC2
G_DAC2
R_DAC1_FB = K_DAC1_FBRT * R_APC_FB R_DAC2_FF = 0
R_DAC1 = R_DAC1_FF + R_DAC1_FB
RE_DAC2_GAIN
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_FF
RE_DAC2_GAIN
G_DAC1/G_DAC2 = 1 or 0.5
G_DAC1/G_DAC2 = 1 or 0.5
R_DAC2 = R_DAC2_FB = R_APC_FB
Table 4-5 EEPROM Assignmentsfor typical operation
RE_APC_ RE_APC_ RE_APC_ E_DAC2_TC
E_DAC1_TC
I-DAC2
(BIAS)
I-DAC1
(MOD)
FF
FF_SET
FB_SET
INIT_SET
01
10
0
1
0
1
x
x
x
0
1
0
1
x
x
-
E_DAC1_FF_TC
FB
FB
FF
FF
FF
FF
FF+FB
FB
FB
E_APC_INIT_TC E_DAC1_FF_TC
E_DAC2_FF_TC
E_DAC2_FF_TC E_APC_INIT_TC
E_DAC2_FF_TC E_DAC1_FF_TC
E_DAC2_FF_TC E_DAC1_FF_TC
E_DAC2_FF_TC E_DAC1_FF_TC
FF
FB
FB
FF
FF+FB
FF
FF+FB
FF+FB
FB
10
01
-
11
11
11
01
01
10
10
00
11
00
01
10
11
11
11
11
11
11
-
E_DAC1_FF_TC
E_APC_INIT_TC E_DAC1_FF_TC
E_DAC2_FF_TC
-
FF+FB
FF+FB
E_DAC2_FF_TC E_APC_INIT_TC
Prohibit
FB
E_DAC1_FF_TC: I-DAC1 current data (temperature compensated)
E_DAC2_FF_TC: I-DAC2 current data (temperature compensated)
E_APC_INIT_TC: R_APC_FB initial data (temperature compensated)
Table 4-6 APC FB Operation
RE_APC_ RE_APC_
K_DAC1_FBRT
K_DAC2_FBRT
Remark
FB_SET
FF_SET
XX
XX
XX
00
00
01
10
11
0
1
0
-
0
0
1
-
No FB
FBforMOD
FBfor BIAS
Prohibit
01
R_DAC1_FBRT*1.25/64/G_DAC1
1
R_DAC1_FBRT=E_DAC_FBRT
10
11
1
-
R_DAC2_FBRT/32/G_DAC2 R_DAC2_FBRT=E_DAC_FBRT
Prohibit
-
<MS0189-E-01>
-18-
2004/5
AKM [ ASAHI KASEI MICROSYSTEMS ]
