ASAHI KASEI
[AK2572]
Ⅵ．CIRCUIT DESCRIPTION
1. Operational Description Notation
In order to distinguish various pre-set parameter sources from EEPROM, Registers or Device pins,“ Identifier –
Main name “ notation is used in the AK2572 circuit description as shown in Table 1-1. For ease of operational
description, internal signals are sometimes defined which are all expressed in small letters.
Table 1-1 Definition of Terms
Identifier
Main name
REGISTER name
（All Capital）
Remark
Example
R_DAC2
Register
R_
Indicating Register
EEPROM name
（All Capital）
EEPROM
E_
Indicating EEPROM
E_BIAS_TC
REGISTER name
EEPROM name
（All Capital）
Either or Both Register
or/and EEPROM
Indicating either or both
Register or/and EEPROM
RE_
RE_DAC3_GAIN
BLOCK name
（All Capital）
signal name
（All small letter）
BLOCK
I-DAC1
vpd
Internal node
Identification words are assigned to the name of Register / EEPROM as shown in Table 1-2 so that each
function can be easily assumed by each name.
Table 1-2 Identification Word Classification
Classification
Identification
suffix
Suffix
_SET
_SEL
_TC
_WIN
_TRGT Target value
Contents
Example
Functional setting
Functional selection
RE_APC_FF_SET
E _MODV_SEL
E_MOD_TC
RE_TEMP_WIN
RE_APC_TRGT
Temperature compensation value
Window width setting by ALM set
Functional
identification
word
APC
DAC
BIAS
MOD
APC related, common for I-DAC1, I-DAC2 and V-DAC3 RE_APC_FF_SET
I-DAC, V-DAC related
Bias current ( I-DAC2 ) related
MOD current ( I-DAC1, V-DAC3 ) related
E_DAC_SET
R_BIAS_FF
E_MOD_TC
EXTRA EXTRA DAC ( DAC not set to MOD ) related
TEMP Temperature sensor related
R_EXTRA
R_TEMP
PWR
ALM
FF
Power leveling function related
Alarm related
FeedForward function
FeedBack function
FB dividing
Timer related
Gain adjust
Burst mode support function related
Status signals
R_PWR_SEL
R_TEMPALM_SET
RE_APC_FF_SET
RE_APC_FB_SET
R_MOD_FBRT
R_TIMER_OPTALM
E_DAC1_GAIN
E_BURST_ALM
R_TXFLT_ST
FB
FBRT
TIMER
GAIN
BURST
ST
Signal polarity
POL
E_EXTALM1_POL
< Note > Numeric values in the circuit description of the AK2572 are expressed in Binary, Decimal or
Hexadecimal. In order to identify the differences, setting values in Hexadecimal are expressed with a small
character “h“ suffix.
-11-
<MS0290-E-01>
2004/8
AKM [ ASAHI KASEI MICROSYSTEMS ]
