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AK2573AVB 参数 Datasheet PDF下载

AK2573AVB图片预览
型号: AK2573AVB
PDF下载: 下载PDF文件 查看货源
内容描述: 125M / 156M激光二极管驱动器+ APC [125M / 156M Laser Diode Driver + APC]
分类和应用: 驱动器驱动程序和接口二极管激光二极管接口集成电路PC
文件页数/大小: 38 页 / 266 K
品牌: AKM [ ASAHI KASEI MICROSYSTEMS ]
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ASAHI KASEI  
[AK2573A]  
4.2.1 PDGAIN  
PD monitor current is converted to the average voltage with RPD and CPD and input to PDIN. PDIN voltage may be  
gained at PDGAIN and monitored at PDMON. PDGAIN should be adjusted to PDMON = 1V typ. The gain range  
of PDGAIN is –8.0dB to 23.5dB with 0.5dB steps (6-bits). PDGAIN is set via the I2CTM interface. Table 4-1 shows  
PDIN input range and Table 4-2 shows the relationship between PDGAIN and EEPROM setting.  
Table 4-1 PDIN input range  
Parameter  
PDIN Input range  
min  
0.08V  
max  
2.5V  
Remark  
Table 4-2 PDGAIN  
RE_PDGAIN_SET  
000000 (0)  
000001 (1)  
:
Gain (typ) [dB]  
Remark  
0.5dB step  
23.5  
23.0  
:
111110 (62)  
111111 (63)  
-7.5  
-8.0  
4.2.2 DACAPC  
DACAPC generates the reference voltage of APC (vapc_ref). AK2573A supplies a programmed APC reference in  
response to the temperature from an on-chip temperature sensor (every 6, APC reference data is stored in  
E_APC_TRGT_TC, see Table 8-3 for more information). Write same data into E_APC_TRGT_TC for constant APC  
reference. Table 4-3 shows the relationship between APC reference voltage (vapc_ref) and EEPROM setting.  
Table 4-3 DACAPC  
E_APC_TRGT_TC  
(R_APC_TRGT)  
00000(0)  
DACAPC (vapc_ref) (typ) [V]  
0.792  
Remark  
13mV step  
:
01111 (15)  
10000 (16)  
10001 (17)  
:
0.987  
1.0  
1.013  
11111 (31)  
1.195  
4.2.3 Example of APC Setting  
Table 4-4 shows the typical setting of APC function (APC_FF and APC_FB). The combination of APC is set by  
RE_APC_FF and RE_APC_FB. Fig 4-5 shows the EEPROM area for MOD current (E_DAC1_TC) and BIAS  
current (E_DAC2_TC). The data should be stored in E_DAC1_TC and E_DAC2_TC is determined by RE_APC_FF  
and RE_APC_FB. Table 4-7 and 4-8 shows all combination of APC function.  
RE_APC_FF is 2bit data to be assigned I-DAC for APC_FF operation. MSB is for I-DAC2 and LSB for I-DAC1.  
RE_APC_FB is 2bit data to be assigned I-DAC for APC_FB operation. MSB is for I-DAC2 and LSB for I-DAC1.  
In the case of RE_APC_FB=11(binary), AK2573A is in “Dual Feedback” (see Fig 4-9, 4-10 and Table 4-6).  
<MS0189-E-01>  
-16-  
2004/5