AK2574VB AKM [Asahi Kasei Microsystems], AK2574VB Datasheet - Page 13

• Manufacturer Part Number: AK2574VB
• Description: 156M Laser Diode Driver + APC for Burst Mode
• Manufacturer: AKM [Asahi Kasei Microsystems]

The AK2574 has 3 primary functions; 125M / 156M modulation (MOD) current switching and BIAS current
There are 3 operation modes in the AK2574. Since each adjusting function is controlled through I
(1) Self-running Mode
Self-running mode is ready for normal operation after all adjustments are completed. In this mode, temperature
detection, EEPROM access and feeding current are automatically performed using the on-chip oscillator. The
AK2574 works in this mode after power-on.
(2) Adjustment Mode
(3) EEPROM Mode
EEPROM mode is used for storing LD characteristics into EEPROM via I
1. Parameter Notation
1.1 Parameter Definition
In the AK2574 Circuit Description, in order to distinguish various pre-set parameter sources from EEPROM,
Registers or Device pins, “Identifier - Main name” notation is used as shown in Table 1-1. For ease of operational
description, small letters sometimes expresses internal signals.
Table 1-1 Parameter Definitions
1.2 Operation Overview
switching part, APC (Automatic Power Control) part, and the Control part to control operation modes of the AK2574
operation.
realizes an automatic parameter adjustment.
Adjustment mode is designed for training the LD characteristics. The AK2574 operates according to the register
settings set through the I
<MS0266-E-00>
Ether or both Register
or /and EEPROM
Register
EEPROM
PIN
BLOCK
Internal Node
2
C
TM
I/F.
Identifier
R_
E_
RE_
P_
None
None
Main Name
REGISTER name
(All Capital)
EEPROM name
(All Capital))
REGISTER /
EEPROM name
(All Capital)
PIN name
(All Capital)
BLOCK name
(All Capital))
signal name
(small letter)
Ⅵ. Circuit Description
-13-
or EEPROM
Indicates either register
Remark
Indicates register
Indicates EEPROM
2
C
TM
I/F.
Example
R_DAC1
E_DAC1
RE_DAC1
P_PDIN
I-DAC1
txact_ref
2
C
TM
Interface, it
2003/12