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