AK2571 Datasheet, PDF (46/52 Pages) Asahi Kasei Microsystems – Single-Chip Automatic Power/Temperature Control for WDM Laser Diodes

AKM Confidential
AK2571
*1) AMON output voltage
*2) Center voltage of Output ”Vmon” is indicated by the expression below, if DAC code = ”K”.
Vmon = (2.1 - 0.5 ) / 255 * K + 0.5 [V]
(10) DAC_APC characteristics
Parameter
Resolution
DNL
INL
Step (=1LSB)
Output voltage range
Condition
Peak voltage
Output digital code
min
Typ
max Unite Remark
7
bit
-1
1
LSB
-2
2
LSB
4.8
mV/step
1.5
2.1
V Design
target
*1)
D[6:0] (00)h-(7F)h (straight binary)
1.5V ～ 2.1V
*1) Center voltage of Output ”Vapc” is indicated by the expression below, if DAC code = ”K”.
Vapc = (2.1 – 1.5 ) / 127 * K + １.5 [V]
(11) IDAC１characteristics
Parameter
Condition
min
typ
max Unite Remark
Resolution
INL
Maximum output current
-2
109.6
8
121.8
+2
134.0
bit
LSB
mA ±10%
Minimum output current
*1)*4)
30
mA *2)*4)
Step (=1LSB)
Output voltage
DNL
Input digital code
0.353
1.8
-1
+1
D[7:0] (00)h - (FF)h (straight binary)
mA/step *3)*4)
V *5)
LSB
*1) at maximum (FF)h setting, gain is 1.
*2) at minimum (00)h setting, gain is 1.
*3) output current ”Iidac1” is indicated by the expression below, if gain is ”G”, DAC setting code is ”K”.
Iidac1 = (maximum output current – minimum output current) / 255 * G * K + minimum output current [mA]
*4) maximum output current, minimum output current and resolution can be set by register.
E_DAC1_GAIN Gain
[1:0]
Minimum output Maximum
Resolution
current
output current (Design target)
(Design target) (Design target)
Remarks
00
1
30mA
01
1/2 15mA
10
1/4 7.5mA
11
1/12 2.5mA
121.8mA
60.9mA
30.45mA
10.15mA
0.36mA/step
0.18mA/step
0.09mA/step
0.03mA/step
Default
*5) Construct external circuit to ensure the voltage of IOUT1 doesn’t exceed this value. If it is over, output current
can’t be guaranteed.
<Rev. 0.6E Preliminary>
-46-
2001/11