AK2571 Datasheet, PDF (30/52 Pages) Asahi Kasei Microsystems – Single-Chip Automatic Power/Temperature Control for WDM Laser Diodes

AKM Confidential
AK2571
7.2 Data construction
1) Temperature compensation data
Force the temperature compensation current on the output of DAC1-3 using the internal T_V converter. Digital MSB
4-bits of data from the T_V converter becomes the address of EEPROM and 5-bit (R_TV[3]) selects the 8-bits data whether
D15-D8 or D7-D0. Table 7-3 indicate the temperature compensation data format.
Table 7-3 Temperature compensation data
Name
E_DAC1_TV
Function
I-DAC1
Temperature
compensation
data
E_DAC2_TV
E_DAC3_TV
I-DAC2
Temperature
compensation
data
I-DAC3
Temperature
compensation
data
A7, A6
xx
Address
A5, A4 A3-A0
00 0000
|
1111
xx
01 0000
|
1111
xx
10 0000
|
1111
Data
D15-D8
D7-D0
E_DAC1_TV E_DAC1_TV
[00001]
[00000]
|
|
E_DAC1_TV E_DAC1_TV
[11111]
[11110]
E_DAC2_TV E_DAC2_TV
[xxxx1]
[xxxx0]
E_DAC3_TV E_DAC3_TV
[xxxx1]
[xxxx0]
(1) Setting data for each wavelength
Table 7-4 and 7-5 indicate the data construction for setting data of each wavelength.
Address is A3 toA0 ([A7:A6] is set by WAVE1, 0 and [A5, A4] is fixed [1,1])
Reg marked “1” indicate the existence of related register.
Table 7-4 setting data of each wavelength
Name
Bit
Function
Reg A7-A4 A3-A0 Data
Setting
E_PDGAIN
E_PDMON_SET
5
PDGAIN set
1
3
PDMON output voltage
set
1
E_ATC_OFFSET
6
ATC OFFSET set
1
E_MON_DAC_FIX 8
E_DAC1_GAIN
2
MON_DAC
fixed value
output ₁
I-DAC1 Gain set
1
E_DAC2_GAIN
2
I-DAC2 Gain set
1
00000: 0dB
xx11 0000 D4-D0 11111: 21.7dB
0.7dB Step, Refer table3-3
000: 0.4V
0000 D7-D5 111: 1.1V
0.1V Step, Refer table 3-2
Refer Table 4-6, 4-7
0000
D15-D8
000000: 0.3V
101000: 1.7V
29.7mV / Step
0001 D7-D0 Refer table 6-1
Refer table 3-5
0010 D1-D0 00: 1, 01: 1/2, 10: 1/4,
11: 1/12
0010
D3-D2
Refer table 3-6
00: 1, 01: 1/2, 10: 1/4
<Rev. 0.6E Preliminary>
-30-
2001/11