參數(shù)資料
型號(hào)： AK2574
廠商： 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)： 17/30頁(yè)
文件大?。?/td> 248K
代理商： AK2574
ASAHI KASEI
[AK2574]
<MS0266-E-00>
-17-
2003/12
2.4 APC
AK2574 provides the APC (AutoPower Control) function for the burst mode application. APC is composed of a
programmable BIAS and MOD currents in response to the temperature (APC_FF), an on-chip temperature sensor,
and 2 current DACs (I-DAC1 and I-DAC2).
2.4.1
APC_FF
Fig 2-7 illustrates the APC_FF functions. The operation is as follows:
(1) Analog to digital conversion of the votage (7 bit) that reflects the temperature for every temperature detection
period (128ms typ).
(2) Read the 8 bit current data (address is indicated by the ADC data) from EEPROM and set this value tothe
I-DACs.
If the current data over temperature is set toeach EEPROM address, the compensated current is supplied to the LD
automatically.
To use this function, current data should be stored in EEPROM in advance. The temperature sensor covers –40
℃
to
+115
℃
and EEPROM is prepared with 1.5
℃
steps.
Fig 2-7 APC FF function
ADC
(7bit)
EEPROM
I-DAC1
R_TEMP
R_DAC1
Address
Data
MOD
Driver
TEMPSENS
I-DAC2
Memory for
I-DAC1
Memory for
I-DAC2
R_DAC2
LD
Temperature
V
TEMPSENS
charatcteristics
BIAS Current
MOD Current
Addressing with
R_TEMP
BIAS
Driver
2.4.2
AK2574 has twocurrent output 8 bit DACs; I-DAC1 and I-DAC2.
I-DAC1 is 85mA @Full code sink type current DAC for MOD current and I-DAC2 is 54mA @Full code sink type
current DAC for BIAS current.
Table 2-5 shows I-DAC1 characteristics and Table 2-6 shows I-DAC2 characteristics.
I-DAC
Table 2-5 I-DAC1 Characteristics
Item
Resolution
Output Current with
Full Code
1 LSB Current Step
DNL
Condition
min
76
typ
8
85
max
94
Unit Remark
bit
mA
IMOD = VDD – 1.8V
IMOD = VDD – 1.8V
IMOD = VDD – 1.8V
0.333
mA
LSB Code 20h to FFh
-1
+1
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