AKM Confidential
AK2571
All circuit blocks and internal nodes are noted as below
Main name
Example
I-DAC1
PID
Circuit Block
BLOCK NAME (Capital letter)
Internal Node
Signal name (Small letter)
vout
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)
EA_MOD ON/OFF(R_EA_SW)
Frequency(R_EA_FREQ)
Gain(R_EA_GAIN)
I-DAC1～3 ON/
OFF(R__DAC_SET[2:0])
I-DAC1 Gain set
(R_DAC1_GAIN)
LD Ageing
compensation
ON/OFF
APC set
(E__APC_FF_SET)
(E__APC_FB_SET)
EA_MOD
R_DAC1
T-V_
CONV
ADC*
EEPROM
I-DAC1
I-DAC2
I-DAC3
+
IOUT1
IOUT2
IOUT3
I-DAC2 Gain set
(R_DAC2_GAIN)
* Time shearing ADC
R_DAC2
ADDER
PDMON Digital value
(R_PDMOND)
I-DAC3 Gain set
(R_DAC3_GAIN)
ADC*
R_DAC3
PD_MON Target
(R_PDMON_SET)
LD Ageing
PDMON
compensation current
(R_APC_CMPNST)
PDMON
set
ALM polarity set
(R_ALM_POL)
PD GAIN set
(R_PDGAIN)
OPALM
OPALM_
COMP
PD voltage after
PDGAIN
(vpd)
Monitor
PD
PDIN
PDGAIN
APC_
COMP
DIGITAL
FILTER
CPD
ALM polarity
set
RPD
(R_ALM_POL)
vapc_ref
LD ageing compensation
current limit value
(E_APC_FB_MAX)
APC Target
(R_APC_TRGT)
OPALM_
GAIN
CUALM_
COMP
DAC_APC
CUALM
vopalm_ref
Current ALM set
(E_CUALM_SET)
Optical out down
threshold(R_OPALM_SET)
<Rev. 0.6E Preliminary>
-5-
2001/11
AKM [ ASAHI KASEI MICROSYSTEMS ]
