AK2571 Datasheet, PDF (48/52 Pages) Asahi Kasei Microsystems – Single-Chip Automatic Power/Temperature Control for WDM Laser Diodes

AKM Confidential
AK2571
E_DAC2_GAIN
E_DAC3_GAIN
[1:0]
00
01
10
Gain Minimum output Maximum
Resolution Remarks
current
output current (Design target)
(Design target) (Design target)
1
0mA
21.42mA
0.084mA/step Default
1/2
0mA
10.71mA
0.042mA/step
1/4
0mA
5.36mA
0.021mA/step
(14) IDAC4 characteristics
Parameter
Condition
Min
Typ
Max Unite Remarks
Resolution
Maximum output current
Minimum output current
45.58
10
50.64
3.2
55.70
bit
mA ±10% *1)
mA *2)
Step (=1LSB)
Output voltage
DNL
Input digital code
0.050
1.8
-2
+2
D[9:0] 3FF - 000 (straight binary)
mA/step *3)
V *4)
LSB
*1) Current at maximum setting (3FF)h .
*2) current of minimum setting (20)h.
Linearity from (00)h to (40)h is not guaranteed. However (00)h setting, will set an internal switch and force the
output to 0V.
*3) output current ”Iidac4” as indicated by the expression below, if DAC4 setting code is ”K”.
Iidac4= (50.64 / 255 ) * K [mA]
*4) Construct an external circuit to ensure that the IOUT4 voltage does not exceed this value. If this value is exceeded,
output current cannot be guaranteed and .APC operation may not function properly.
(15) Shut down characteristics
Parameter
Conditions
min typ max Unite Remark
SHUTDOWN setup time Time
from
SHUT_APCN/SHUT_ATCN = “L”
to output of IDACx(1,2,3) become
Hi-Z and IDAC4 becomes OFF.
10
μs
SHUTDOWN release time Time from SHUT_APCN = “H” to
IDACx(1,2,3) output settled
current.
500 μs Only for
SHUT_
APCN
*1)
*1) SHUT DOWN release time is regulated in SHUT_APCN.
(16) T_V conversion characteristics
Parameter
Condition
T_V Conv. gain
Offset adjustment
min typ max
-0.7
Regulated by the digital data after A-to-D conversion. Its offset is adjusted by AKM in testing.
Unite Remark
°C/step ±5%
Design
target
<Rev. 0.6E Preliminary>
-48-
2001/11