AK2571 Datasheet, PDF (14/52 Pages) Asahi Kasei Microsystems – Single-Chip Automatic Power/Temperature Control for WDM Laser Diodes

AKM Confidential
AK2571
4. ATC (Automatic Temperature Compensation)
Figure 4-1 ATC Block diagram
REFOUT
Rth
RL
Temperature alarm
threshold
(E_TMPRTALM_WIN)
ATC_LOCK set
(E_LK_TMPRT_WIN)
Regulator
ALM polarity
(R_ALM_POL)
TEMPALM
ALM polarity
PIDALM
TEMPALM
COMP
Detect term set
PID ALM ^(R_ALM_POL)
threshold
(E_PIDALM_SET)
PIDALM
COMP
(E_LK_CNT_SET)
ATC_
LOCK
Non sensed
TEC control way
value(E_PID_INACT) _{(E_TEC_CTRL_SET)}
PID max value(E_PID_MAX) _{(E_TEC_ANALOG) PWM devision}
PID parameter
(R_TEC_PWM_SET)
- ^{(E_PID_P,E_PID_I,E_PID_D)}
HEATP
TEMPIN
vtemp
Gain &
ADC Temperature data
Offset
(R_TMPRT_CRNT)
PID
PID control ^TEC_
(R_PID_VALABS) ^CTRL
COOLP
COOLN
OFFSET voltage
(R_ATC_OFFSET)
Initial temperature
Target
(E_ATC_TRGT)
Parameter of ATC
feed back
(E_ATC_FB_SET)
LD ageing error
current
ATC_FB
(R_APC_CMPNST)
-
Temperature Target
(R_TMPRT__TRGT)
ATC feed back
(R_ATC_CMPNST)
ALM polarity
(R_ALM_POL)
ATC Feed back Alarm
(E_WLALM_SET)
WLALM
COMP
WLALM
HEATN
TECcontrol way
(E_TEC_CTRL_SET, E_TEC_ANALOG)
I-DAC4H
IOUT4H
TECcontrol way
(E_TEC_CTRL_SET, E_TEC_ANALOG)
I-DAC4C
IOUT4C
TEC
control
<Rev. 0.6E Preliminary>
-14-
2001/11