AK2571 Datasheet, PDF (5/52 Pages) Asahi Kasei Microsystems – Single-Chip Automatic Power/Temperature Control for WDM Laser Diodes

AKM Confidential
All circuit blocks and internal nodes are noted as below
Main name
Circuit Block
BLOCK NAME (Capital letter)
Internal Node
Signal name (Small letter)
Example
I-DAC1
PID
vout
AK2571
2.2 Functional explanation
Some values are stored in both register and EEPROM to simplify user programming. Explanations of these values are in
the register description tables.
For EEPROM details, refer to Section 7. EEPROM
For Register details, refer to Section 8. Registers
3. APC (Automatic Power Control)
APC set
(E__APC_FF_SET)
EA_MOD ON/OFF(R_EA_SW)
Frequency(R_EA_FREQ)
LD Ageing
I-DAC1～3 ON/
compensation ^{OFF(R__DAC_SET[2:0])}
ON/OFF
I-DAC1 Gain set
(E__APC_FB_SET) ^{(R_DAC1_GAIN)}
Gain(R_EA_GAIN)
EA_MOD
T-V_
CONV
ADC*
EEPROM
R_DAC1
I-DAC1
+
PDMON
* Time shearing ADC
ADC*
PDMON Digital value
(R_PDMOND)
PD_MON Target
(R_PDMON_SET)
PDMON
set
ADDER
R_DAC2
I-DAC2
I-DAC2 Gain set
(R_DAC2_GAIN)
R_DAC3
I-DAC3
I-DAC3 Gain set
(R_DAC3_GAIN)
LD Ageing
compensation current
(R_APC_CMPNST)
Monitor
PD
PDIN
CPD
RPD
PD GAIN set
(R_PDGAIN)
PDGAIN
PD voltage after
PDGAIN
(vpd)
ALM polarity set
(R_ALM_POL)
OPALM_
COMP
APC_
COMP
DIGITAL
FILTER
APC Target
(R_APC_TRGT)
vapc_ref
LD ageing compensation
current limit value
DAC_APC
OPALM_
GAIN
(E_APC_FB_MAX)
vopalm_ref
Current ALM set
Optical out down
(E_CUALM_SET)
threshold(R_OPALM_SET)
ALM polarity
set
(R_ALM_POL)
CUALM_
COMP
IOUT1
IOUT2
IOUT3
OPALM
CUALM
<Rev. 0.6E Preliminary>
-5-
2001/11