AK2574VB AKM [Asahi Kasei Microsystems], AK2574VB Datasheet - Page 18

• Manufacturer Part Number: AK2574VB
• Description: 156M Laser Diode Driver + APC for Burst Mode
• Manufacturer: AKM [Asahi Kasei Microsystems]

Table 2-6 I-DAC2 Characteristics
2.4.3
Table 2-7 shows the relationship between EEPROM setting (E_DAC2_TC) and I-DAC2 code (R_DAC2). The data to
be set to I-DAC2 (R_DAC2) is limited to 5 or more for BIAS current circuit stability. From 1 to 5 code is changed to 5
and is set to I-DAC2. In the case of 0 code, BIAS driver is turned off and IBIAS pin is Hi-Z.
Table 2-7 I-DAC2 Code Setting
2.4.4
Fig 2-8 shows an on-chip temperature sensor characteristics and Table 2-8 shows the relationship between detected
Fig 2-8 On-chip Temperature Sensor Characteristics
(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.
<MS0266-E-00>
temperature and ADC code.
Resolution
Minimum Output
Current 1
Minimum Output
Current 2
Maximum Output
Current
1 LSB Current Step
DNL
E_DAC2_TC
2.5
2.0
1.5
1.0
0.5
0.0
5 or more
I-DAC2 Minimum Current Output
Temperature Sensor (TEMPSENS)
Item
-40
1～4
0
-20
On-chip Temperature sensor characteristics
IBIAS = VDD – 1.8V
IBIAS = VDD – 1.8V
IBIAS = VDD – 1.8V
0
1 R_DAC2 5
R_DAC2=FFh
IBIAS = VDD
IBIAS = VDD
R_DAC2 = 0
R_DAC2 (I-DAC2 code)
Condition
BIAS Driver = OFF
20
Temperature t [ C]
E_DAC2_TC
5
40
60
min
48
-1
-18-
80
IBIAS = Hi-Z
Code 1 to 4 is forced to be 5
No modification
0.212
1.06
typ
54
8
0
100
max
1.2
60
+1
120
Remarks
Unit Remark
LSB Code 20h to FFh
mA
mA
mA
mA
bit
See 2.4.3
2003/12