ak2574 AKM Semiconductor, Inc., ak2574 Datasheet - Page 13

• Manufacturer Part Number: ak2574
• Description: 156m Laser Diode Driver Apc For Burst Mode
• Manufacturer: AKM Semiconductor, Inc.

The AK2574 has 3 primary functions; 125M / 156M modulation (MOD) current switching and BIAS current
switching part, APC (Automatic Power Control) part, and the Control part to control operation modes of the AK2574
operation.
There are 3 operation modes in the AK2574. Since each adjusting function is controlled through I
realizes an automatic parameter adjustment.
(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
ASAHI KASEI
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
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)
. Circuit Description
-13-
or EEPROM
Indicates either register
Remark
Indicates register
Indicates EEPROM
2
C
T M
I/F.
Example
R_DAC1
E_DAC1
RE_DA C1
P_PDIN
I-DAC1
txact_ref
2
C
TM
[AK2574]
Interface, it
2003/12