參數(shù)資料
型號(hào): AK2574
廠(chǎng)商: Asahi Kasei Microsystems Co.,Ltd
英文描述: 156M Laser Diode Driver + APC for Burst Mode
中文描述: 1.56激光二極管驅(qū)動(dòng)器apc的突發(fā)模式
文件頁(yè)數(shù): 18/30頁(yè)
文件大小: 248K
代理商: AK2574
ASAHI KASEI
[AK2574]
<MS0266-E-00>
-18-
2003/12
Table 2-6 I-DAC2 Characteristics
Item
Resolution
Maximum Output
Current
Minimum Output
Current 1
Minimum Output
Current 2
1 LSB Current Step
DNL
2.4.3
I-DAC2 Minimum Current Output
Table 2-7 shows the relationship between EEPROM setting (E_DAC2_TC) and I-DAC2 code (R_DAC2). The data to
be set toI-DAC2 (R_DAC2) is limited to5 or more for BIAS current circuit stability. From 1 to5 code is changed to5
and is set to I-DAC2. In the case of 0 code, BIAS driver is turned off and IBIAS pin is Hi-Z.
Condition
min
48
typ
8
54
max
60
Unit Remark
bit
mA
IBIAS = VDD – 1.8V
R_DAC2=FFh
IBIAS = VDD
1
R_DAC2
5
IBIAS = VDD
R_DAC2 = 0
IBIAS = VDD – 1.8V
IBIAS = VDD – 1.8V
1.06
1.2
mA
See 2.4.3
0
mA
0.212
mA
LSB Code 20h to FFh
-1
+1
Table 2-7 I-DAC2 Code Setting
E_DAC2_TC
0
1
4
5 or more
R_DAC2 (I-DAC2 code)
BIAS Driver = OFF
5
E_DAC2_TC
Remarks
IBIAS = Hi-Z
Code 1 to 4 is forced to be 5
No modification
2.4.4
Fig 2-8 shows an on-chip temperature sensor characteristics and Table 2-8 shows the relationship between detected
temperature and ADC code.
Temperature Sensor (TEMPSENS)
Fig 2-8 On-chip Temperature Sensor Characteristics
On-chip Temperature sensor characteristics
0.0
0.5
1.0
1.5
2.0
2.5
-40
-20
0
20
40
60
80
100
120
Temperature t [
°
C]
O
(1) Slope: -11.56mV/
(typ)
(2) V(t) = -0.01156 * t + 1.62 [V] (typ)
(3) AD_code = int( V(t) /2.2 * 127 +0.5) = int(-0.667*t + 94.0)
(4) Temperature step @AD_code=1LSB: 1.49
/LSB
Note: Temperature sensor detects the junction temperature, not LD or ambient temperature.
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