ASAHI KASEI
[AK2574]
AK2574
156M
Laser Diode Driver + APC for Burst Mode
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Features
156M Laser Diode Driver for burst mode application
BIAS current switching
Programmable laser BIAS and modulation current
controlled by an on-chip temperature sensor
(APC_FF)
Two current output 8 bit DACs,
I-DAC1: 85mA sink for modulation current
I-DAC2: 54mA sink for BIAS current
Power failure alarm (TXACT), CLK failure alarm
(CLKALM)
I
2
C
TM
compatible digital I/F
Duty adjustment
Single 3.3V +/- 0.2V operation
Description
The AK2574 is a 1chip LDD (Laser Diode Driver) and
an APC (Auto Power Control) for burst mode
application such as ATM-PON. It contains not only
156M LDD for modulatin current but also BIAS
current switching, programmable BIAS and
modulation currents, duty adjustment, I
2
C
TM
interface,
an EEPROM for storing LD characteristics and user
information.
The AK2574 has an APC FF (Feed-forward) function
that supplies a programmed current in response to the
temperature.
All program and operational functions can be set
through the I
2
C
TM
compatible interface and stored in the
on-chip EEPROM.
Ordering Information
Product Number
AK2574VB
Block Diagram
PKG
BCC++ 48 (7mm * 7mm)
Applications
ITU-T G.983 ATM-PON ONU
I
2
C
TM
is a trademark o f Philips Corporation.
LD
SEL
IMODN
DATAP
DATAN
DATA
(LVPECL)
data
FF
data_ff
AND
DUTY_
ADJ
MOD
DRIVER
IMOD
IBIAS
IBIASR1
IBIASC1
0.1uF
IBIASC2
0.1uF
BRSTP
BRSTN
BRST
(LVPECL)
brst
FF
brst_ff
Ibias
330Ω
BIAS
DRIVER
CLKP
CLKN
CLK
(LVPECL)
clk
CLK_
DET
Imod
SEL
Monitor
PD
i_pd
PDIN
CLKALM
DAC
(TXACT)
txact_ref
COMP
(TXACT)
comp_out
SET/
RESET
AND
TXACT
RPD
TEMPMON
TEMPSENS
ADC
APC_FF
I-DAC2
OSC
EEPROM
BIAS_
GEN
Digital I/F (I
2
C
TM
)
SCL
SDA*
WP**
TXDIS
I-DAC1
BIAS
RB (12k)
CONTROL
*: Open Drain
**: Pull-up
<MS0266-E-00>
-1-
2003/12
AKM [ ASAHI KASEI MICROSYSTEMS ]
