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參數(shù)資料
| 型號： | AK2572 |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 英文描述： | APC for Burst Mode Applicable Direct Modulation Laser Diode |
| 中文描述： | apc的突發(fā)模式適用的直接調(diào)制激光器 |
| 文件頁數(shù)： | 13/50頁 |
| 文件大?。?/td> | 463K |
| 代理商： | AK2572 |
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ASAHI KASEI
[AK2572]
-13-
<MS0290-E-01>
2004/8
3. I-DAC, V-DAC Functional Part
The AK2572 equips Current source type I-DAC1 (Max. sourcing current
＝
10.2 mA [Typ.]) and Voltage output
type V-DAC3 (Max. output voltage
＝
2.2 V [Typ.]) for the LD modulation current setting, and Current sink type
I-DAC2 (Max. sink current
＝
85.0 mA [Typ.] ) for the bias current setting. Selection of enable / disable each DAC
is set by RE_DAC_SET. Output current of I-DAC1 (Max. value
＝
10.2 mA / 1.02 mA [Typ.]) and I-DAC2 (Max.
value
＝
85.0 mA / 42.5 mA [Typ.]), and output voltage of V-DAC3 (Max. value
＝
2.2 V / 1.2 V [Typ.]) can be
switched by gain setting. This gain switching allows to lower current consumption and to improve the accuracy
per 1 LSB. In Tables 3-1 ~ 3-3, the characteristics of I-DAC2, I-DAC1 and V-DAC3 are shown.
I-DAC2 directly sets the LD bias current. A current multiplied by a factor of 0.012 [Typ.] of I-DAC2 set value is
output (Current source) on BIASMON-pin.
Table 3-1 I-DAC2 characteristics (I-DAC2 is set “Enabled” / “Disabled” by RE_DAC_SET [1]
＝
“1” / “0”)
RE_DAC2_GAIN
Gain
Max. output current (Code
＝
FFh)
［
Typ
］
Range
［
Typ
］
Current/step
［
Typ
］
1
1
85.0 mA
0
1/2
42.5 mA
[Note] I-DAC2 characteristics : Resolution
＝
8 bits, DNL
＝±
1 LSB (DAC code
＝
10h ~ FFh)
Output current variation at Maximum DAC code (FFh)
＝
Typ.
±
8 %
0 ~ 85.0 mA
0 ~ 42.5 mA
333
μ
A
167
μ
A
Temperature compensation data (Retained in EEPROM), which are set for I-DAC1 and V-DAC3, can be
selected by RE_MODV_SEL setting as shown in Table 3-4.
When E_MOD_TC (128 address locations) is assigned as the setting data, I-DAC1(RE_MODV_SEL
＝
“0”)
generates a reference current of the modulation current to external Laser Diode Driver (LDD), and V-DAC3
(RE_MODV_SEL
＝
“1”) generates a reference voltage of the Modulation current to external LDD. A voltage
driver type LDD can also be adopted by converting an I-DAC1 output current to a voltage by external
resistors or by using V-DAC3 output voltage. When E_EXTRA_TC (32 address locations) is assigned as the
setting data, I-DAC1 output (RE_MODV_SEL
＝
“1”) or V-DAC3 output (RE_MODV_SEL
＝
“0”) can be used
as APD control voltage or LDD reference voltage etc.. When temperature compensation by E_EXTRA_TC is
not required, same data should be written at all address locations.
Table 3-2
I-DAC1 characteristics (I-DAC1 is set “Enabled” / “Disabled” by RE_DAC_SET [0]
＝
“1” / “0”)
RE_DAC1_GAIN
Gain
Max. output current (Code
＝
FFh)
［
Typ
］
Range
［
Typ
］
Current / step
［
Typ
］
1
1
10 .2 mA
0
1/10
1.02 mA
[Note] I-DAC1 characteristics : Resolution
＝
8 bits, DNL
＝±
1 LSB (DAC code
＝
10h ~ FFh)
Output current variation at Maximum DAC code (FFh)
＝
Typ.
±
8 %
0 ~ 10 .2 mA
0 ~ 1.02 mA
40
μ
A
4
μ
A
Table 3-3
V-DAC3 characteristics (V-DAC3 is set “Enabled” / “Disabled” by RE_DAC_SET [2]
＝
“1” / “0”)
RE_DAC3_GAIN
Gain
Max. output voltage (Code
＝
FFh)
［
Typ
］
Range
［
Typ
］
Voltage / step
［
Typ
］
1
1.2 / 2.2
1.2 V
0
1
2.2 V
[Note] V-DAC3characteristics : Resolution
＝
8 bits, DNL
＝±
1 LSB (DAC code
＝
20h ~ FFh)
Output voltage variation at Maximum DAC code (FFh)
＝
Typ.
±
8 %
0 ~ 1.2 V
0 ~ 2.2 V
4.7 mV
8.6 mV
Table 3-4 RE_MODV_SEL setting
RE_MODV_SEL
0
1
[Note] Although E_MOD_TC has 128 address locations and E_EXTRA_TC has 32 address locations,
temperature resolution of each temperature compensation data is 0.75
℃
[typ.] because of the
temperature compensation data is derived from a linear interpolation method (Refer to Section 4.1).
I-DAC1
E_MOD_TC
E_EXTRA_TC
V-DAC3
E_EXTRA_TC
E_MOD_TC
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